CN102181283B - CdS/Cd(OH)2 composite nano wire and preparation method thereof - Google Patents
CdS/Cd(OH)2 composite nano wire and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a CdS/Cd(OH)2 composite nano wire and a preparation method thereof. The provided CdS/Cd(OH)2 composite nano wire is prepared according to the following method by the steps of: mixing cadmium salt, monomer, ultraviolet initiator and (E-CE)C, and preparing a solution film from the mixed solution; polymerizing methyl acrylic acid in the solution film under the irradiation of an ultraviolet light source to obtain an (E-CE)C/PMA/CdMA2 composite film; performing H2S atmosphere treatment to convert the inorganic salt into CdS inorganic semiconductor nano granules, drying, sintering, and partially oxidizing the CdS nano crystal to obtain CdS/CdO nano crystal; and then dispersing the CdS/CdO nano crystal into deionized water or mixed solution of deionized water and ethanol,and performing ultrasonic treatment so that the CdO is reacted with the water and converted into Cd(OH)2 and the CdS/Cd(OH)2 composite nano wire is formed at the same time. The CdS nano crystal content of the CdS/Cd(OH)2 composite nano wire obtained by the method is controllable; good monodispersibility is kept in the CdS nano crystal of the composite nano wire, so that the composite nano wire isendowed with remarkable photo-induced fluorescent quantum effect; and the length-diameter ratio and the size of the nano wire are controllable.
Description
Technical field
The present invention relates to a kind of CdS/Cd (OH)
2Composite nano-line and preparation method thereof.
Background technology
The one-dimensional polycrystalline nano material has the peculiar property that is different from independent nano particle and one-dimensional single crystal nanostructure, such as the electronics between nanocrystal, photon and energy transfer etc., thereby get more and more people's extensive concerning, have important purposes aspect the preparation of various opto-electronic devices.In various one-dimensional polycrystalline nano materials, semiconductor nanocrystal such as CdS, CdSe, CdTe etc., because its unique photoelectric property receives much concern, and is widely used in opto-electronic device, solar cell, biomarker and sensor field.
Cd (OH)
2Nano structural material has important researching value as forerunner's template of important semiconductor nano material CdS, CdSe and CdTe.The people such as Jiang are by ultrasonic newly-generated Cd (OH) in the NaOH aqueous solution
2Precipitation has obtained Cd (OH)
2Nanorod structure, pass through H as template
2S, H
2Se, H
2Te process prepared CdS, CdSe, CdTe nanometer rod (Jiang, L.P.etc., Journal of Nanoscience and Nanotechnology 2006,6, (8), 2584-2587.).And the compound one-dimensional polycrystalline nano material of CdS/CdSe, CdS/CdTe has unique photoelectric characteristic, have more wide purposes in fields such as opto-electronic device, solar cells, therefore prepare the CdS/Cd (OH) that CdS nanocrystal (NCs) content is controlled, nanowire size is controlled
2The composite nano-line tool is of great significance.
Summary of the invention
The purpose of this invention is to provide a kind of simple, clean, efficient CdS/Cd (OH)
2The preparation method of composite nano-line.
Preparation CdS/Cd provided by the present invention (OH)
2The method of composite nano-line comprises the steps:
1) cadmium salt, monomer, ultraviolet initiator and ethyl-cyanoethyl cellulose are mixed, dissolving evenly obtains mixed solution; Wherein, described cadmium salt is vinylformic acid cadmium (CdAA
2) or methacrylic acid cadmium (CdMA
2), described monomer is vinylformic acid (AA) or methacrylic acid (MA);
2) described mixing solutions is made solution film;
3) described solution film is placed irradiation under the ultraviolet source, make the monomer polymerization in the solution film, obtain ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium salt composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium salt composite membrane;
4) with ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium salt composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium salt composite membrane H
2S gas is processed, and obtains ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium sulfide nanocrystal composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium sulfide nanocrystal composite membrane;
5) described ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium sulfide nanocrystal composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium sulfide nanocrystal composite membrane are carried out sintering under aerobic conditions, obtain the CdS/CdO nano particle;
6) described CdS/CdO nanoparticulate dispersed in deionization or in the mixing solutions of deionized water and ethanol, is obtained the CdS/CdO nanoparticulate dispersion, again dispersion liquid is carried out supersound process, obtain CdS/Cd (OH)
2Composite nano-line.
Wherein, step 1) in, the mass ratio of described cadmium salt, monomer, ultraviolet initiator and ethyl-cyanoethyl cellulose can be (0.2-1): (5-25): (0.05-0.2): (5-15), further be 0.5: (9-21): 0.1: 9.
Described ultraviolet initiator specifically can be 2-hydroxy-2-methyl Propiophenone, 1-hydroxy-cyclohexyl phenyl ketone, 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio group) phenyl]-1-acetone, 2; 4,6-trimethylbenzoyl-diphenyl phosphine oxide and 2-hydroxy-2-methyl-1-[4-(2-hydroxyl-oxethyl) phenyl]-a kind of in the 1-acetone.
The molecular weight of described ethyl-cyanoethyl cellulose can be 1000-100000Da, is preferably 10000-80000Da.
For the ease of step 1) in four kinds of raw materials mix, can first cadmium salt, monomer and ultraviolet initiator be mixed, mix with ethyl-cyanoethyl cellulose (E-CE) C, airtight lucifuge is placed and is made the ethyl-cyanoethyl cellulose dissolving more than 5 days evenly under the room temperature, obtains mixing solutions again.
Step 2) be that the solution employing ordinary method of ethyl-cyanoethyl cellulose/methacrylic acid/methacrylic acid cadmium is made solution film in, as in the liquid crystal cell that is formed by sheet glass, polyester film and teflon gasket, being pressed into solution film.The thickness of described solution film can be 10-500 μ m.
Step 3) in, described ultraviolet light irradiation intensity can be 1-100mW/cm
2The time of irradiation can be 5-20min.
Step 4) in, H
2The time of S gas processing can be 10-40 hour.
Step 5) in, the temperature of described sintering is 350-1000 ℃, preferred 400-600 ℃; The time of described sintering is 2-48 hour.Can obtain the CdS/CdO nano particle of different CdS content by the time of regulating sintering.
Step 6) in, the content of CdS/CdO nano particle can be 1mg/ml-200mg/ml in the described CdS/CdO nanoparticulate dispersion, preferred 10mg/ml-100mg/ml; In the described supersound process, ultrasonic power is 10 watts-200 watts, and the time of supersound process is 2-24 hour.The mass ratio of deionized water and ethanol is (2-8) in the mixing solutions of described deionized water and ethanol: (8-1).
The CdS/Cd that the present invention prepares (OH)
2The diameter of composite nano-line can be the 2-100 nanometer, preferred 10-50 nanometer; Length can be 50 nanometers-100 micron, preferred 1-50 micron; Described CdS/Cd (OH)
2The percentage composition of the middle CdS nanocrystal of nano wire is 1-70%.
Method of the present invention is mixed methacrylic acid cadmium (or vinylformic acid cadmium), methacrylic acid (or Acrylic Acid Monomer) and ultraviolet initiator with ethyl-cyanoethyl cellulose, mixing solutions is made solution film; Irradiation under ultraviolet source makes the methacrylic acid polymerization in the solution film, obtains (E-CE) C/PMA/CdMA
2Composite membrane; Again through H
2S atmosphere makes inorganic salt be converted into CdS inorganic semiconductor nano particle after processing, and obtains the CdS/CdO nanocrystal behind drying sintering and the partial oxidation CdS nanocrystal; Then be scattered in the deionized water or in deionized water/alcohol mixeding liquid, and through ultrasonication, make CdO and steeping in water for reconstitution give birth to reaction and change Cd (OH) into
2, form simultaneously CdS/Cd (OH)
2Composite nano-line.
The present invention prepares CdS/Cd (OH)
2The method of composite nano-line does not need to use expensive high-temperature high-voltage reaction equipment and the physics of complexity or the processing step of chemical preparation nanocrystal, and technique is simple, and is with low cost; Preparation-obtained CdS/Cd (OH)
2CdS nanocrystal content is controlled in the composite nano-line; Keep good monodispersity in the CdS nanocrystal in the composite nano-line, thereby given its significant photoluminescence quantum effect (seeing attached Figure 4 and 5); Length-to-diameter ratio and the size of nano wire are controlled, are applicable to large-scale industrial production.This CdS/Cd (OH)
2Composite nano-line can be applicable to opto-electronic device, solar cell, biomarker and sensor field.
Description of drawings
Fig. 1 is the CdS/Cd (OH) of embodiment 2 preparations
2The scanning electron photomicrograph of nano wire.
Fig. 2 is the CdS/Cd (OH) of embodiment 15 preparations
2The scanning electron photomicrograph of nano wire.
Curve a is the X ray diffracting spectrum for the pure CdS nano wire of contrast reference among Fig. 3, and curve b is the CdS/Cd (OH) of embodiment 1 preparation
2The X ray diffracting spectrum of nano wire; Curve c is the CdS/Cd (OH) of embodiment 3 preparations
2The X ray diffracting spectrum of nano wire; Curve d is the CdS/Cd (OH) of embodiment 9 preparations
2The X ray diffracting spectrum of nano wire.
Fig. 4 is the CdS/Cd (OH) of embodiment 2 preparations
2The high resolution transmission electron micrograph of composite nano-line, CdS nano particle has wherein kept preferably monodispersity, indicates among the figure: 1-CdS nano particle, 2-CdS/Cd (OH)
2Composite nano-line.
Curve a, b, c, d are respectively the prepared CdS/Cd (OH) of embodiment 1, embodiment 6, embodiment 13 and embodiment 16 among Fig. 5
2The photoluminescence spectrum of nano wire.
Embodiment
Below by specific embodiment method of the present invention is described, but the present invention is not limited thereto.
Experimental technique described in the following embodiment if no special instructions, is ordinary method; Described reagent and material if no special instructions, all can obtain from commercial channels.
Embodiment 1:
(1) with 0.5g vinylformic acid cadmium (CdAA
2), 9.0g vinylformic acid (AA), 0.1g ultraviolet initiator (2-hydroxy-2-methyl Propiophenone) mixes and obtains settled solution, then mix in Glass Containers with the ethyl-cyanoethyl cellulose [(E-CE) C] (molecular weight is 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/AA/CdAA of 50%
2Homogeneous solution ((E-CE) C is as solute in this solution, and AA consists of solution as solvent (also be polymerization single polymerization monomer simultaneously)).(2) with mentioned solution sheet glass be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that forms of polyester film and teflon gasket.(3) (intensity is 100mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 5min, make the AA monomer polymerization in the system, obtain (E-CE) C/PAA/CdAA
2Composite membrane.(4) take out (E-CE) C/PAA/CdAA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PAA/CdSNCs composite membrane.(5) (E-CE) C/PAA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 1h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 71.5% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is supersound process 5h in the ultrasonic apparatus of 100W in power under the room temperature in deionized water, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellow CdS/Cd (OH)
2Floss obtains yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 31 nanometers, and mean length is 7.2 microns, and it is 70.3% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 540 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 2:
(1) with 0.5g vinylformic acid cadmium (CdAA
2), 9.0g vinylformic acid (AA), 0.1g ultraviolet initiator (2-hydroxy-2-methyl Propiophenone) mixes and obtains settled solution, then mix in Glass Containers with the ethyl-cyanoethyl cellulose [(E-CE) C] (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/AA/CdAA of 50%
2Homogeneous solution.(2) with mentioned solution sheet glass be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that forms of polyester film and teflon gasket.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the AA monomer polymerization in the system, obtain (E-CE) C/PAA/CdAA
2Composite membrane.(4) take out (E-CE) C/PAA/CdAA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PAA/CdSNCs composite membrane.(5) (E-CE) C/PAA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 2h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 63.5% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is supersound process 5h in the ultrasonic apparatus of 100W in power under the room temperature in deionized water, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellow CdS/Cd (OH)
2Floss obtains yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, and mean length is 7.5 microns, and it is 61.4% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 535 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 3:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 3h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 54.8% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellow CdS/Cd (OH)
2Floss obtains yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, and mean length is 7.4 microns, and it is 52.7% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 530 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 4:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 13.5g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 40%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) then solution film is placed that (intensity is 50mW/cm under the ultraviolet source
2) irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 48.1% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, mean length is 7.5 microns, it is 46.9% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 470 nanometers and 530 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 5:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 21.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 30%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 6h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 32.4% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, mean length is 7.7 microns, it is 30.5% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak has significant photoluminescence quantum effect for being positioned at 470 nanometers and 535 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 6:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 30000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 10h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 24.9% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, mean length is 7.3 microns, it is 23.5% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 470 nanometers and 560 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 7:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 30000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 15h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 12.3% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellowish CdS/Cd (OH)
2Floss obtains little yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, mean length is 7.3 microns, it is 10.6% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 460 nanometers and 520 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 8:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger (2-hydroxy-2-methyl Propiophenone) mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 80000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 20h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 4.1% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellowish CdS/Cd (OH)
2Floss obtains little yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, and mean length is 7.3 microns, and it is 3.6% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak is 462 nanometers under the ultraviolet excitation of 400 nanometers at wavelength, has significant photoluminescence quantum effect.
Embodiment 9:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 10000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 24h, and partial oxidation CdS, obtaining brown color CdS/CdO nano particle, it is 1.5% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in deionized water, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain yellowish CdS/Cd (OH)
2Floss obtains little yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 30 nanometers, and mean length is 7.3 microns, and it is 1.1% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak is 460 nanometers under the ultraviolet excitation of 400 nanometers at wavelength, has significant photoluminescence quantum effect.
Embodiment 10:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 48.3% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 8/1, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 35 nanometers, mean length is 6.3 microns, it is 47.1% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 465 nanometers and 530 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 11:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.6% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 6/1, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 33 nanometers, mean length is 5.4 microns, it is 45.9% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 468 nanometers and 540 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 12:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 10000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.5% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 4/1, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 36 nanometers, mean length is 3.6 microns, it is 46.3% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 470 nanometers and 540 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 13:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.3% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 2/1, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 35 nanometers, mean length is 2.4 microns, it is 46.1% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 470 nanometers and 520 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 14:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.8% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 1/1, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 36 nanometers, mean length is 1.5 microns, it is 46.3% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 460 nanometers and 520 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 15:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.4% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 1/2, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 33 nanometers, mean length is 1.0 microns, it is 46.1% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 465 nanometers and 530 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Embodiment 16:
(1) with 0.5g methacrylic acid cadmium (CdMA
2), 9.0g methacrylic acid (MA), 0.1g light trigger 2-hydroxy-2-methyl Propiophenone mix and obtain settled solution, then mix in Glass Containers with (E-CE) C (molecular weight 50000) of 9.0g, airtight and at room temperature lucifuge place and to make its dissolving more than 5 days evenly, obtain mass concentration and be (E-CE) C/MA/CdMA of 50%
2Homogeneous solution.(2) with mentioned solution at sheet glass, be pressed into the solution film that thickness is about 100 μ m in the liquid crystal cell that polyester film and teflon gasket form.(3) (intensity is 50mW/cm then solution film to be placed ultraviolet source
2) lower irradiation 10min, make the MA monomer polymerization in the system, obtain (E-CE) C/PMA/CdMA
2Composite membrane.(4) take out (E-CE) C/PMA/CdMA
2Composite membrane places and is connected with H
2Process 24h in the encloses container of S gas, obtain faint yellow transparent (E-CE) C/PMA/CdSNCs composite membrane.(5) (E-CE) C/PMA/CdS NCs composite membrane is placed the retort furnace that is connected with air, remove organic constituent at 450 ℃ of lower sintering 4h, obtain brown color CdS/CdO nano particle, it is 47.2% that element sulphur is analyzed the CdS crystalline content.(6) the CdS/CdO nanoparticulate dispersed that sintering is obtained is in the mixed solvent of deionized water/ethanol mass ratio 1/4, and room temperature is supersound process 5h in the ultrasonic apparatus of 100W in power, makes CdO become Cd (OH) with the water complete reaction
2, obtain flaxen CdS/Cd (OH)
2Floss obtains faint yellow CdS/Cd (OH) after the vacuum-drying
2Nano wire, the mean diameter that records nano wire is 31 nanometers, mean length is 500 nanometers, it is 46.0% that element sulphur is analyzed the CdS crystalline content, this nano wire is that its maximum fluorescence emission peak position has significant photoluminescence quantum effect in 460 nanometers and 570 nanometers under the ultraviolet excitation of 400 nanometers at wavelength.
Claims (13)
1. one kind prepares CdS/Cd (OH)
2The method of composite nano-line comprises the steps:
1) cadmium salt, monomer, ultraviolet initiator and ethyl-cyanoethyl cellulose are mixed, dissolving evenly obtains mixed solution; Wherein, described cadmium salt is vinylformic acid cadmium or methacrylic acid cadmium, and described monomer is acrylic or methacrylic acid;
2) described mixing solutions is made solution film;
3) described solution film is placed irradiation under the ultraviolet source, make the monomer polymerization in the solution film, obtain ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium salt composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium salt composite membrane;
4) with ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium salt composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium salt composite membrane H
2S gas is processed, and obtains ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium sulfide nanocrystal composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium sulfide nanocrystal composite membrane;
5) described ethyl-cyanoethyl cellulose/polyacrylic acid/cadmium sulfide nanocrystal composite membrane or ethyl-cyanoethyl cellulose/polymethyl acrylic acid/cadmium sulfide nanocrystal composite membrane are carried out sintering under aerobic conditions, obtain the CdS/CdO nano particle;
6) described CdS/CdO nanoparticulate dispersed in deionization or in the mixing solutions of deionized water and ethanol, is obtained the CdS/CdO nanoparticulate dispersion, again dispersion liquid is carried out supersound process, obtain CdS/Cd (OH)
2Composite nano-line.
2. method according to claim 1, it is characterized in that: in the described step 1), the mass ratio of described cadmium salt, monomer, ultraviolet initiator and ethyl-cyanoethyl cellulose is (0.2-1): (5-25): (0.05-0.2): (5-15).
3. method according to claim 1 and 2, it is characterized in that: in the described step 1), described ultraviolet initiator be selected from following any one: 2-hydroxy-2-methyl Propiophenone, 1-hydroxy-cyclohexyl phenyl ketone, 2-methyl-2-(4-morpholinyl)-1-[4-(methylthio group) phenyl]-1-acetone, 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide and 2-hydroxy-2-methyl-1-[4-(2-hydroxyl-oxethyl) phenyl]-1-acetone; The molecular weight of described ethyl-cyanoethyl cellulose is 1000-100000Da.
4. method according to claim 1, it is characterized in that: the method for in the described step 1) cadmium salt, monomer, ultraviolet initiator and ethyl-cyanoethyl cellulose being mixed is specific as follows: first cadmium salt, monomer and ultraviolet initiator are mixed, mix with ethyl-cyanoethyl cellulose again, airtight lucifuge is placed and is made the ethyl-cyanoethyl cellulose dissolving more than 5 days evenly under the room temperature, obtains mixing solutions.
5. method according to claim 1, it is characterized in that: described step 2), the thickness of described solution film is 10-500 μ m; In the described step 3), the intensity of described ultraviolet source is 1-100mW/cm
2, the time of described irradiation is 5-20min.
6. method according to claim 1 is characterized in that: in the described step 4), and the described H that uses
2The time that S gas is processed is 10-40 hour.
7. method according to claim 1, it is characterized in that: in the described step 5), the temperature of described sintering is 350-1000 ℃; The time of described sintering is 2-48 hour.
8. method according to claim 7, it is characterized in that: in the described step 5), the temperature of described sintering is 400-600 ℃.
9. method according to claim 1, it is characterized in that: in the described step 6), the content of CdS/CdO nanocrystal is 1mg/ml-200mg/ml in the described CdS/CdO nanoparticulate dispersion; The mass ratio of deionized water and ethanol is (2-8) in the mixing solutions of described deionized water and ethanol: (8-1); In the described supersound process, ultrasonic power is 10 watts-200 watts, and the time of supersound process is 2-24 hour.
10. method according to claim 9, it is characterized in that: in the described step 6), the content of CdS/CdO nanocrystal is 10mg/ml-100mg/ml in the described CdS/CdO nanoparticulate dispersion.
11. the CdS/Cd (OH) that each described method prepares among the claim 1-10
2Composite nano-line.
12. CdS/Cd according to claim 11 (OH)
2Composite nano-line is characterized in that: described CdS/Cd (OH)
2The diameter of composite nano-line is the 2-100 nanometer; Length is 50 nanometers-100 micron; Described CdS/Cd (OH)
2The percentage composition of the CdS nanocrystal in the nano wire is 1-70%.
13. CdS/Cd according to claim 12 (OH)
2Composite nano-line is characterized in that: described CdS/Cd (OH)
2The diameter of composite nano-line is the 10-50 nanometer; Length is the 1-50 micron.
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| CN103882514B (en) * | 2014-02-28 | 2016-08-24 | 湖南大学 | A kind of CdS semiconductor/CdSSe heterojunction nano-wire and preparation method thereof |
| CN106047348B (en) * | 2016-05-24 | 2018-02-06 | 合肥工业大学 | A kind of β NaYF4:The preparation method of Yb, Tm@CdS core shell nanostructureds |
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