CN103884423A - Zinc oxide/ reduced graphene oxide composite nanomaterial and preparation method thereof and ultraviolet light detector - Google Patents
Zinc oxide/ reduced graphene oxide composite nanomaterial and preparation method thereof and ultraviolet light detector Download PDFInfo
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Abstract
The invention discloses a preparation method of a zinc oxide/ reduced graphene oxide composite nanomaterial. The method comprises enabling graphene oxide and zinc oxide granules to have reduction reaction under the presence of reducing agent. The invention also discloses the zinc oxide/ reduced graphene oxide composite nanomaterial prepared with the above method. Besides, the invention discloses an ultraviolet light detector. The ultraviolet light detector comprises a detection component and a power supply. The detection component comprises a base, a composite nanomaterial layer and two conductive adhesive layers. The composite nanomaterial layer and the two conductive adhesive layers are formed on the base; the two conductive adhesive layers are arranged at the two sides of the composite nanomaterial layer respectively and are in contact with the two sides of the composite nanomaterial layer. The positive pole and negative pole of the power supply are in electrical connection with the two conductive adhesive layers respectively. The composite nanomaterial layer is the zinc oxide/ reduced graphene oxide composite nanomaterial provided in the invention. Through the above technical scheme, the performance of the ultraviolet light detector is effectively improved.
Description
Technical field
The present invention relates to a kind of zinc paste/redox graphene composite nano materials and preparation method thereof, and a kind of ultraviolet light detector.
Background technology
Zinc paste (ZnO) is a kind of important metal oxide semiconductor, have advantages of many outstanding, as: under room temperature, there is wider band gap, higher exciton binding energy and be easy to preparation etc.In the recent period, because ZnO nano material response is quick and the high feature of on-off ratio makes its application aspect in Ultraviolet sensor field show huge potentiality.
At present, the senior ZnO nano-structure of the various patterns such as one-dimensional nano line, nanometer rods, nanosphere, nanometer sheet, nano flower, quadrangular pyramid application to some extent in the preparation of Ultraviolet sensor.But on the one hand, due to these nanostructured pattern complexity, utilize existing photoetching and electron beam exposure technique to make device, somewhat expensive, and also output is not high; On the other hand, because they mostly are discrete single micro-structure, contact resistance is large, and causes poor electrical performance; In addition, also there is the defect that on-off ratio is low, dark current is large in it, and these defects have all restricted its application in ultraviolet detector field.
Therefore, need that a kind of cost of exploitation is low, contact resistance is little badly, conduct electricity very well, on-off ratio is high, dark current is little ZnO nano material, to improve its application in ultraviolet detector.
Summary of the invention
The object of the invention is that existing ZnO nano material cost is high in order to overcome, contact resistance is large, poor electric conductivity, on-off ratio is low and dark current is large shortcoming, zinc paste/redox graphene composite nano materials that provide that a kind of cost is low, contact resistance is little, conduct electricity very well, on-off ratio is high and dark current is little and preparation method thereof, and a kind of ultraviolet light detector.
The present inventor's discovery, grapheme material has very high light transmission rate, and the transmitance of its ultraviolet and visible ray can be up to 97.7%; And grapheme material has high electronic conductance.This two large feature makes it possess the application potential quality at the auxiliary ZnO of raising ultraviolet transducing aspect of performance.The above characteristic of the present inventor based on Graphene, itself and zinc paste (ZnO) are formed to zinc paste/redox graphene (ZnO/RGO) composite nano materials, and this composite nano materials is applied in ultraviolet light detector, unexpected discovery, it not only can not affect the absorption of ZnO to ultraviolet light; Also can effectively reduce the compound of photo-generated carrier, thus realized contact resistance little, conduct electricity very well, on-off ratio is high, guarantee the object that dark current is little simultaneously.In addition, because ultraviolet light detector provided by the invention is simple in structure, therefore lower cost.
Based on above discovery, the invention provides a kind of preparation method of zinc paste/redox graphene composite nano materials, the method comprises: under the existence of reductive agent, make graphene oxide and Zinc oxide particles generation reduction reaction.
Second aspect, provides zinc paste/redox graphene of being prepared by method provided by the invention composite nano materials.
The third aspect, the invention provides a kind of ultraviolet light detector, this ultraviolet light detector comprises detection part and power supply, described detection part comprises substrate, composite nano materials layer and two conductive adhesive layers, described composite nano materials layer and described conductive adhesive layer are formed in described substrate, two conductive adhesive layers lay respectively at the both sides of described composite nano materials layer, and with the contact both sides of described composite nano materials layer; The positive pole of described power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, and wherein, described composite nano materials layer is zinc paste/redox graphene composite nano materials provided by the invention.
Pass through technique scheme, zinc paste/redox graphene composite nano materials provided by the invention is applied in ultraviolet light detector, the object that realized that cost is low, contact resistance is little, conduct electricity very well, on-off ratio is high and dark current is little, has improved the performance of ultraviolet light detector effectively.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the preparation flow schematic diagram of ultraviolet light detector.
Fig. 2 is the ZnO/RGO composite nano materials structure scanning electron microscope image of synthetic Different Weight ratio: Fig. 2 (a) is the RGO/ZnO of 0 % by weight; Fig. 2 (b) is the RGO/ZnO of 0.1 % by weight; Fig. 2 (c) is the RGO/ZnO of 2 % by weight; Fig. 2 (d) is the RGO/ZnO of 10 % by weight.
Fig. 3 is the photoelectron spectroscopy spectrogram of the RGO/ZnO composite nano materials of silk ball shape ZnO particle and 10 % by weight.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The preparation method who the invention provides a kind of zinc paste/redox graphene composite nano materials, the method comprises: under the existence of reductive agent, make graphene oxide and Zinc oxide particles generation reduction reaction.
According to the present invention; the source of described graphene oxide has no particular limits; can be by commercially available; also can prepare according to existing method; for example; graphene oxide can be according to Preparation of Graphitic Oxide(William S.Hummers, and Richard E.Offeman; J.Am.Chem.Soc.1958,80,1339) in, the method for report is synthesized.
In the present invention, the consumption of described graphene oxide and Zinc oxide particles can be according to actual needs and the efficiency of reaction regulate, under preferable case, the weight ratio of the consumption of described graphene oxide and Zinc oxide particles can be 0.1-100:1000.In preferred situation, in the time of the good on-off ratio effect of needs, the weight ratio of the consumption of described graphene oxide and Zinc oxide particles can be 0.1-1:1000; In the time of the larger probe current of needs, the weight ratio of the consumption of described graphene oxide and Zinc oxide particles can be 5-100:1000.
In the present invention, the particle diameter of graphene oxide and Zinc oxide particles is had no particular limits, as long as can be used for the preparation of zinc paste/redox graphene composite nano materials.Consider reaction efficiency, the particle diameter of described graphene oxide is 1-100 μ m; Be preferably 1-20 μ m.
According to the present invention, the shape of described Zinc oxide particles can be conventional various Zinc oxide particles shapes, as long as it can realize object of the present invention with graphene oxide formation zinc paste/redox graphene composite nano materials.But the present inventor finds, silk ball shape Zinc oxide particles is because its larger size and higher specific surface area make it to have very little dark current and higher sensitivity, and the zinc paste/redox graphene composite nano materials therefore preparing with silk ball shape Zinc oxide particles and graphene oxide is prepared ultraviolet light detector can further improve the performance of ultraviolet light detector.Wherein, described silk ball shape Zinc oxide particles can be according to Synthesis of flower-like ZnO nanostructures by an organic-free hydrothermal process(Hui Zhang; Deren Yang; Xiangyang Ma; Yujie Ji, Jin Xu and Duanlin Que; Nanotechnology, 2004,15,622) in, disclosed method is synthesized and is obtained.
According to the present invention, kind and consumption to reductive agent have no particular limits, as long as can be fully by described graphene oxide reduction.Considering cost and reduction efficiency, preferably, described reductive agent is hydrazine hydrate and/or sodium borohydride; The weight ratio of the consumption of described reductive agent and graphene oxide is 0.7-5:1, is preferably 1-4:1.In addition, the concentration of described reductive agent also has no particular limits, as long as guarantee that its addition is in above-mentioned preferable range, preferably, after guaranteeing to add reductive agent, can not impact reaction system, described reductive agent, for example, the concentration of hydrazine hydrate can be 60-80 % by weight, and the concentration of sodium borohydride can be 1-20 % by weight.
According to the present invention, the condition of described reduction reaction is had no particular limits, can carry out and can fill graphene oxide is reduced as long as can guarantee to react.Consider reaction efficiency and reaction time, the condition of described reduction reaction comprises: pH value is 7-10, preferably 7.5-9; Temperature of reaction is 80-120 ℃, preferably 85-100 ℃; Reaction time is 1-5 hour, preferably 1.5-3 hour.
Preferably, described reduction reaction is carried out in water.
In the present invention, in above reduction reaction, the mode that adds of each material also has no particular limits, and can add step by step, also can add simultaneously.For example, can in water, first add described graphene oxide, and then add Zinc oxide particles, finally add again reductive agent to carry out reduction reaction.
According to the present invention, in described water, add after graphene oxide and Zinc oxide particles, also comprise and stirring and ultrasonic step, so that graphene oxide fully contacts with Zinc oxide particles, described ultrasonic frequency can be 30-50kHz, power can be 250-500W, and the ultrasonic time can be 20-40 minute.
According to the present invention, for fear of the structure of ZnO particle is damaged, preferably use weak base to regulate the pH value of reaction system, described weak base can be one or more in ammoniacal liquor, sodium carbonate, sodium bicarbonate and triethylamine.
According to the present invention, after reduction reaction finishes, also comprise Separation of Solid and Liquid and dry step, to obtain zinc paste/redox graphene composite nano materials powder.The method of described Separation of Solid and Liquid and dry condition can be carried out according to method known in those skilled in the art and condition, for example, can carry out Separation of Solid and Liquid by centrifugal method; Dry temperature can be 40-60 ℃, and the dry time can be more than 12 hours, preferably 12-20 hour.
Second aspect, provides zinc paste/redox graphene of being prepared by method provided by the invention composite nano materials.
The third aspect, the invention provides a kind of ultraviolet light detector, this ultraviolet light detector comprises detection part and power supply, described detection part comprises substrate, composite nano materials layer and two conductive adhesive layers, described composite nano materials layer and described conductive adhesive layer are formed in described substrate, two conductive adhesive layers lay respectively at the both sides of described composite nano materials layer, and with the contact both sides of described composite nano materials layer; The positive pole of described power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, and wherein, described composite nano materials layer is zinc paste/redox graphene composite nano materials provided by the invention.
Wherein, consider electric conductivity and the cost of film, under preferable case, the thickness of described composite nano materials layer is 8-15 μ m.
Wherein, to the material of described substrate, there is no particular limitation in the present invention, for example, can be dimethyl silicone polymer (PDMS) substrate.Dimethyl silicone polymer (PDMS) substrate can be according to PDMS(Sylgard184, Dow Corning) instructions be prepared and obtain.
Wherein, the kind of described conducting resinl is had no particular limits, for example, described conducting resinl can be copper glue, elargol etc.
In this described ultraviolet light detector, two conductive adhesive layers can be respectively by the contact both sides of sidepiece and composite nano materials layer, also be the sidepiece of a conductive adhesive layer and a side contacts of composite nano materials layer, the sidepiece of another conductive adhesive layer contacts with the opposite side of composite nano materials layer; Also can make two conductive adhesive layers partly be covered on described composite nano materials layer respectively, and not contact between two conductive adhesive layers.Under preferable case, on Width (direction from a conductive adhesive layer to another glue-line), the width that each conductive adhesive layer is covered in the part of composite nano materials layer is 0.5-1.5cm, and the distance between two conductive adhesive layers is 3-8mm.
Below will describe the present invention by embodiment.Graphene oxide is according to Preparation of Graphitic Oxide(William S.Hummers, and Richard E.Offeman; J.Am.Chem.Soc.1958,80,1339) in, the method for report is synthesized; Silk ball shape Zinc oxide particles is according to Synthesis of flower-like ZnO nanostructures by an organic-free hydrothermal process(Hui Zhang; Deren Yang; Xiangyang Ma, Yujie Ji, Jin Xu and Duanlin Que; Nanotechnology, 2004,15,622) in, disclosed method is synthesized; On-off ratio refers to the current ratio before and after device illumination; Dark current refers to before device illumination, i.e. current value under dark condition; Response time refers to the 63% needed time that starts to rise to maximum photocurrent from dark current; Refer to the 37% needed time that drops to maximum photocurrent from maximum photocurrent release time.
Embodiment 1
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
1, the preparation of zinc paste/redox graphene (RGO/ZnO) composite nano materials:
(1) in 100ml water, add 0.5mg graphene oxide (GO) (particle diameter be 1-20 μ m), and then add 1g silk ball shape ZnO(particle diameter be 1-20 μ m), after stirring in 40kHz, 500W power ultrasonic is processed 30 minutes, the suspension 1 of the RGO/ZnO composite nano materials that is 0.05% for the preparation of RGO/ZnO weight ratio that obtains homogeneous.
(2) in the suspension 1 obtaining in step (1), add the hydrazine hydrate solution (it is 1:1 that the addition of hydrazine hydrate solution makes the mass ratio of hydrazine hydrate and GO) of 80 % by weight to obtain the suspension 2 of silk ball shape zinc paste, graphene oxide and reductive agent, and regulate the pH value to 8 of described suspension 2 with the ammoniacal liquor of 28 % by weight, stir and in the water-bath of 95 ℃, react 2 hours after 10 minutes.
(3) reacted suspension 2 is carried out separating for centrifugal 5 minutes with the rotating speed of 5000rpm, then by be deposited at 50 ℃ dry 15 hours that obtain, obtain RGO/ZnO(weight ratio) be 0.05% composite nano materials powder, and use scanning electron microscope (Hitach, S-4800) structure of the described RGO/ZnO composite nano materials powder of observation preparation, its structure scanning electron microscope image is shown in Fig. 2.
2, the preparation of ultraviolet light detector:
(1) the RGO/ZnO composite nano materials of the above-mentioned preparation of 10mg is dissolved in 2ml ethanol, in the ultrasonic processing of 40kHz 30 minutes; And get 40 μ l and drop on the silicon chip of 1cm × 1cm size, ethanol nature evaporate to dryness; Repeat to drip 5 times to obtain RGO/ZnO composite nano materials film, thickness is 10.5 μ m.
(2) prepare PDMS substrate according to PDMS product (Sylgard 184, Dow Corning) instructions, and this substrate is covered on the ZnO/RGO film of preparation in step (1), 65 ℃ solidify 3 hours.
(3) slowly peel off described silicon chip, ZnO/RGO composite nano materials layer is stayed in PDMS substrate.
(4) conductive silver glue is coated in to composite nano materials layer both sides, wherein, on Width (direction from a conductive adhesive layer to another glue-line), the width that each conductive adhesive layer is covered in the part of composite nano materials layer is 1cm, distance between two conductive adhesive layers is 5mm, and the positive pole of power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, obtain ultraviolet light detector.Fig. 1 has shown the preparation flow schematic diagram of ultraviolet light detector.
3, performance test
Adopt portable simple and easy uviol lamp (Shanghai Jia Peng Science and Technology Ltd., ZF-5) providing wavelength is the ultraviolet source of 254nm, utilize Keithley-4200 semiconductor parameter instrument (Keithley company) test component performance, the dark current that obtains this device is 0.06nA, the detectable electric current of maximum detecting is 7.6nA, and on-off ratio is 126.Response time and release time are in table 1.
Embodiment 2
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
1, the preparation of zinc paste/redox graphene (RGO/ZnO) composite nano materials:
(1) in 100ml water, add the GO(particle diameter of 1mg be 10-50 μ m), and then add 1g silk ball shape ZnO(particle diameter be 2-10 μ m), after stirring in 50kHz, 250W power ultrasonic is processed 20 minutes, the suspension 1 of the RGO/ZnO composite nano materials that is 0.1% for the preparation of RGO/ZnO weight ratio that obtains homogeneous.
(2) in the suspension 1 obtaining in step (1), add the hydrazine hydrate solution (it is 2:1 that the addition of hydrazine hydrate solution makes the mass ratio of hydrazine hydrate and GO) of 70 % by weight to obtain the suspension 2 of silk ball shape zinc paste, graphene oxide and reductive agent, and regulate the pH value to 7.5 of described suspension 2 with the sodium carbonate of 30 % by weight, stir and in the water-bath of 80 ℃, react 3 hours after 10 minutes.
(3) reacted suspension 2 is carried out separating for centrifugal 5 minutes with the rotating speed of 5000rpm, then by be deposited at 40 ℃ dry 20 hours that obtain, obtain RGO/ZnO(weight ratio) be 0.1% composite nano materials powder, and use scanning electron microscope (Hitachi, S-4800) structure of the described RGO/ZnO composite nano materials powder of observation preparation, its structure scanning electron microscope image is not shown.
2, the preparation of ultraviolet light detector:
(1) the RGO/ZnO composite nano materials of the above-mentioned preparation of 10mg is dissolved in 2ml ethanol, in the ultrasonic processing of 40kHz 30 minutes; And get 40 μ l and drop on the silicon chip of 1cm × 1cm size, ethanol nature evaporate to dryness; Repeat to drip 5 times to obtain RGO/ZnO composite nano materials film, thickness is 10.5 μ m.
(2) prepare PDMS substrate according to PDMS product (Sylgard 184, Dow Corning) instructions, and this substrate is covered on the ZnO/RGO film of preparation in step (1), 65 ℃ solidify 3 hours.
(3) slowly peel off described silicon chip, ZnO/RGO composite nano materials layer is stayed in PDMS substrate.
(4) conductive silver glue is coated in to composite nano materials layer both sides, wherein, on Width (direction from a conductive adhesive layer to another glue-line), the width that each conductive adhesive layer is covered in the part of composite nano materials layer is 1cm, distance between two conductive adhesive layers is 5mm, and the positive pole of power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, obtain ultraviolet light detector.Fig. 1 has shown the preparation flow schematic diagram of ultraviolet light detector.
3, performance test
Adopt portable simple and easy uviol lamp (Shanghai Jia Peng Science and Technology Ltd., ZF-5) providing wavelength is the ultraviolet source of 254nm, utilize Keithley-4200 semiconductor parameter instrument (Keithley company) test component performance, the dark current that obtains this device is 0.06nA, the detectable electric current of maximum detecting is 4.8nA, and on-off ratio is 80.Response time and release time are in table 1.
Embodiment 3
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
1, the preparation of zinc paste/redox graphene (RGO/ZnO) composite nano materials:
(1) in 100ml water, add the GO(particle diameter of 0.1mg be 10-50 μ m), and then add 1g silk ball shape ZnO(particle diameter be 2-5 μ m), after stirring in 50kHz, 250W power ultrasonic is processed 40 minutes, the suspension 1 of the RGO/ZnO composite nano materials that is 0.01% for the preparation of RGO/ZnO weight ratio that obtains homogeneous.
(2) in the suspension 1 obtaining in step (1), add the sodium borohydride solution (it is 5:1 that the addition of sodium borohydride solution makes the mass ratio of sodium borohydride and GO) of 20 % by weight to obtain the suspension 2 of silk ball shape zinc paste, reduced graphene and reductive agent, and regulate the pH value to 9 of described suspension 2 with the triethylamine of 25 % by weight, stir and in the water-bath of 120 ℃, react 1.5 hours after 10 minutes.
(3) reacted suspension 2 is carried out separating for centrifugal 5 minutes with the rotating speed of 5000rpm, then by be deposited at 60 ℃ dry 12 hours that obtain, obtain RGO/ZnO(weight ratio) be 0.01% composite nano materials powder, and use scanning electron microscope (Hitachi, S-4800) structure of the described RGO/ZnO composite nano materials powder of observation preparation, its structure scanning electron microscope image is not shown.
2, the preparation of ultraviolet light detector:
(1) the RGO/ZnO composite nano materials of the above-mentioned preparation of 10mg is dissolved in 2ml ethanol, in the ultrasonic processing of 40kHz 30 minutes; And get 40 μ l and drop on the silicon chip of 1cm × 1cm size, ethanol nature evaporate to dryness; Repeat to drip 5 times to obtain RGO/ZnO composite nano materials film, thickness is 10.5 μ m.
(2) prepare PDMS substrate according to PDMS product (Sylgard 184, Dow Corning) instructions, and this substrate is covered on the ZnO/RGO film of preparation in step (1), 65 ℃ solidify 3 hours.
(3) slowly peel off described silicon chip, ZnO/RGO composite nano materials layer is stayed in PDMS substrate.
(4) conductive silver glue is coated in to composite nano materials layer both sides, wherein, on Width (direction from a conductive adhesive layer to another glue-line), the width that each conductive adhesive layer is covered in the part of composite nano materials layer is 1cm, distance between two conductive adhesive layers is 5mm, and the positive pole of power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, obtain ultraviolet light detector.Fig. 1 has shown the preparation flow schematic diagram of ultraviolet light detector.
3, performance test
Adopt portable simple and easy uviol lamp (Shanghai Jia Peng Science and Technology Ltd., ZF-5) providing wavelength is the ultraviolet source of 254nm, utilize Keithley-4200 semiconductor parameter instrument (Keithley company) test component performance, the dark current that obtains this device is 0.06nA, the detectable electric current of maximum detecting is 3.2nA, and on-off ratio is 53.Response time and release time are in table 1.
Embodiment 4
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
Prepare zinc paste/redox graphene composite nano materials and ultraviolet light detector according to the method for embodiment 1, different is, in 100ml water, add the GO of 5mg, the suspension 1 of the RGO/ZnO composite nano materials that is 0.5% for the preparation of RGO/ZnO weight ratio that obtains homogeneous, the structure scanning electron microscope image of final gained RGO/ZnO composite nano materials is not shown, and the performance test results of gained ultraviolet light detector is in table 1.
Embodiment 5
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
Prepare zinc paste/redox graphene composite nano materials and ultraviolet light detector according to the method for embodiment 1, different is, in 100ml water, add the GO of 20mg, the suspension 1 of the RGO/ZnO composite nano materials that is 2% for the preparation of RGO/ZnO weight ratio that obtains homogeneous, the structure scanning electron microscope image of final gained RGO/ZnO composite nano materials is shown in Fig. 2, and the test result of gained ultraviolet light detector is in table 1.
Embodiment 6
The present embodiment is for illustrating preparation method and the ultraviolet light detector of zinc paste/redox graphene composite nano materials provided by the invention
Prepare zinc paste/redox graphene composite nano materials and ultraviolet light detector according to the method for embodiment 1, different is, in 100ml water, add the GO of 50mg, the suspension 1 of the RGO/ZnO composite nano materials that is 5% for the preparation of RGO/ZnO weight ratio that obtains homogeneous, the structure scanning electron microscope image of final gained RGO/ZnO composite nano materials is shown in Fig. 2, and the test result of gained ultraviolet light detector is in table 1.
Embodiment 7
The present embodiment is for illustrating preparation method and the ultraviolet light detector method of zinc paste/redox graphene composite nano materials provided by the invention
Prepare zinc paste/redox graphene composite nano materials and ultraviolet light detector according to the method for embodiment 1, different is, in 100ml water, add the GO of 100mg, the suspension 1 of the RGO/ZnO composite nano materials that is 10% for the preparation of RGO/ZnO weight ratio that obtains homogeneous, the structure scanning electron microscope image of final gained RGO/ZnO composite nano materials is shown in Fig. 2, and the test result of gained ultraviolet light detector is in table 1.
The present embodiment has been tested interaction force type between RGO/ZnO in addition
Adopt photoelectron spectroscopy testing apparatus (Thermo Scientific, ESCALAB250Xi) to adopt respectively the ZnO/RGO composite nano materials of the spherical Zinc oxide particles of pure show and 10 % by weight to survey the photoelectron spectroscopy of zinc (Zn).Zn 2p
1/2with Zn 2p
3/2the combination energy blue shift 1.1eV of electronics, this shows that, owing to intercoupling with a kind of chemistry between RGO and ZnO, this coupling scheme contribute to its separation to photogenerated charge, result is as shown in Figure 3.
Comparative example 1
The present embodiment is for illustrating the ultraviolet light detector that prior art provides
Method according to embodiment 1 is prepared ultraviolet light detector, different, only uses and prepares ultraviolet light detector without the silk ball shape zinc paste of method processing of the present invention.The test result of gained ultraviolet light detector is in table 1.
Table 1
Can find out by upper table, the embodiment 1-7 of ultraviolet light detector prepared by the zinc paste/redox graphene composite nano materials providing of the present invention is provided, compared with the comparative example 1 that only uses ultraviolet light detector prepared by zinc paste that adopts prior art to provide, there is on-off ratio high, the advantage such as detectable maximum current is large.
In the time that the weight ratio of RGO/ZnO is less than or equal to 0.1 % by weight, because the introducing of RGO has obvious enhancement effect to the on-off ratio of ZnO ultraviolet detector, wherein, in the time that the weight ratio of RGO/ZnO is 0.05 % by weight, it is maximum that on-off ratio reaches, and can reach 126.
In the time that the weight ratio of RGO/ZnO is greater than or equal to 0.5 % by weight, because the introducing of RGO has obvious enhancing to whole detector probe current, wherein, in the time that the weight ratio of RGO/ZnO is 10 % by weight, probe current can reach 900nA.
Claims (10)
1. a preparation method for zinc paste/redox graphene composite nano materials, the method comprises: under the existence of reductive agent, make graphene oxide and Zinc oxide particles generation reduction reaction.
2. method according to claim 1, wherein, the weight ratio of the consumption of graphene oxide and Zinc oxide particles is 0.1-100:1000.
3. method according to claim 1, wherein, the weight ratio of the consumption of described reductive agent and graphene oxide is 0.7-5:1, is preferably 1-4:1.
4. according to the method described in any one in claim 1-3, wherein, described reduction reaction is carried out in water, and the condition of described reduction reaction comprises: pH value is 7-10, preferably 7.5-9; Temperature of reaction is 80-120 ℃, preferably 85-100 ℃; Reaction time is 1-5 hour, preferably 1.5-3 hour.
5. according to the method described in any one in claim 1-3, wherein, described reductive agent is hydrazine hydrate and/or sodium borohydride.
6. according to the method described in any one in claim 1-3, wherein, the particle diameter of described graphene oxide is 1-100 μ m.
7. according to the method described in any one in claim 1-3, wherein, the particle diameter of described Zinc oxide particles is 1-20 μ m, described Zinc oxide particles be shaped as silk ball shape.
8. zinc paste/redox graphene composite nano materials that in claim 1-7 prepared by the method described in any one.
9. a ultraviolet light detector, this ultraviolet light detector comprises detection part and power supply, described detection part comprises substrate, composite nano materials layer and two conductive adhesive layers, described composite nano materials layer and described conductive adhesive layer are formed in described substrate, two conductive adhesive layers lay respectively at the both sides of described composite nano materials layer, and with the contact both sides of described composite nano materials layer; The positive pole of described power supply and negative pole are electrically connected with described two conductive adhesive layers respectively, it is characterized in that, described composite nano materials layer is zinc paste/redox graphene composite nano materials claimed in claim 8.
10. ultraviolet light detector according to claim 9, wherein, the thickness of described composite nano materials layer is 8-13 μ m.
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| CN106025251A (en) * | 2016-07-28 | 2016-10-12 | 新乡市超力新能源有限公司 | Preparation method of negative electrode material of zinc and nickel battery and slurry mixing method of negative electrode of zinc and nickel battery |
| CN110627108A (en) * | 2019-09-27 | 2019-12-31 | 东华大学 | Zinc oxide/reduced graphene oxide composite material and preparation method and application thereof |
| CN114084900A (en) * | 2021-10-21 | 2022-02-25 | 红河学院 | Preparation method of Au @ AuPt3D ZnO-GO composite nano material and detection of doxorubicin hydrochloride by using Au @ AuPt3D ZnO-GO composite nano material |
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| CN101324465A (en) * | 2007-06-14 | 2008-12-17 | 积创科技股份有限公司 | Multi-direction received ultraviolet ray sensor |
| CN102654474A (en) * | 2011-03-02 | 2012-09-05 | 中国科学院微电子研究所 | Making method of nano film of graphene doped zinc oxide |
Non-Patent Citations (2)
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| SUNG WON HWANG ET.AL: "Plasmon-Enhanced Ultraviolet Photoluminescence from Hybrid Structures", 《PHYSICAL REVIEW LETTERS》 * |
| WANG, Z ET.AL: "A flexible UV nanosensor based on reduced graphene oxide decorated Zn0 nanostructures", 《NANOSCALE》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021655A (en) * | 2015-07-03 | 2015-11-04 | 西安工业大学 | ZnO nano wall/RGO heterojunction gas-sensitive sensor and preparation method thereof |
| CN105021655B (en) * | 2015-07-03 | 2017-08-22 | 西安工业大学 | ZnO nano wall/RGO hetero-junctions gas sensors and preparation method thereof |
| CN106025251A (en) * | 2016-07-28 | 2016-10-12 | 新乡市超力新能源有限公司 | Preparation method of negative electrode material of zinc and nickel battery and slurry mixing method of negative electrode of zinc and nickel battery |
| CN110627108A (en) * | 2019-09-27 | 2019-12-31 | 东华大学 | Zinc oxide/reduced graphene oxide composite material and preparation method and application thereof |
| CN114084900A (en) * | 2021-10-21 | 2022-02-25 | 红河学院 | Preparation method of Au @ AuPt3D ZnO-GO composite nano material and detection of doxorubicin hydrochloride by using Au @ AuPt3D ZnO-GO composite nano material |
| CN114084900B (en) * | 2021-10-21 | 2024-02-23 | 红河学院 | Preparation method of Au@AuPt3D ZnO-GO composite nano material and detection of doxorubicin hydrochloride by using same |
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| Publication number | Publication date |
|---|---|
| CN103884423B (en) | 2016-01-20 |
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