CN114853051B - Cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof - Google Patents

Cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof Download PDF

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CN114853051B
CN114853051B CN202210311193.7A CN202210311193A CN114853051B CN 114853051 B CN114853051 B CN 114853051B CN 202210311193 A CN202210311193 A CN 202210311193A CN 114853051 B CN114853051 B CN 114853051B
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胡敬
李金娟
刘波
徐守西
魏涛
程淼
刘倩倩
李宛飞
凌云
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Suzhou University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G3/00—Compounds of copper
    • C01G3/02—Oxides; Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/72—Copper
    • B01J35/40—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
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    • C01—INORGANIC CHEMISTRY
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    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/182—Graphene
    • C01B32/184—Preparation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/30—Particle morphology extending in three dimensions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention relates to a cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof, and relates to the technical field of nanocomposite. The preparation method comprises the following steps of adding graphene oxide into cuprous oxide dispersion liquid under alkaline conditions to obtain mixed liquid; the mass concentration of the cuprous oxide dispersion liquid is 1-5mg/mL; the pH of the alkaline condition is 9-14; stirring and reacting the mixed solution to obtain the Cu 2 O@CuO-RGO nanocomposite. The method disclosed by the invention is simple in process, safe and reliable, high in purity of the obtained product, low in cost and easy to prepare on a large scale; cu obtained by the preparation 2 The O@CuO-RGO multi-stage nanocomposite has outstanding advantages in the application of detecting nitrogen dioxide gas.

Description

Cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof
Technical Field
The invention relates to the technical field of nanocomposite materials, in particular to a cuprous oxide@copper oxide-graphene nanocomposite material and preparation and application thereof.
Background
Currently, in the research field of new materials, nano materials are the most active research objects which have important influence on human social development. The transition metal nano oxide semiconductor material is suitable for being applied to the aspects of electrode materials, catalysts, sensor sensitive materials and the like due to the advantages of large specific surface area, unique structure, easiness in preparation and the like. In recent years, scholars at home and abroad research and develop a series of semiconductor materials with sensing characteristics, and the semiconductor materials are applied to the fields of safety early warning, environmental monitoring and the like.
Copper oxide is a very important p-type semiconductor material in transition metal oxide materials, and has the properties of narrow band gap (1.2 eV), low cost, good thermal stability and the like. Because it belongs to hole conduction, compared with the traditional n-type semiconductor sensor sensitive materials studied earlier, such as tin dioxide, zinc oxide, and the like, the nano copper oxide has obvious advantages and different sensing mechanisms in the aspects of selectivity, sensitivity, and the like.
The Chinese patent application with publication number of CN102156156A discloses the preparation of a three-dimensional copper oxide nano flower-sheet type enzyme-free glucose sensor electrode. The method is simple, is easy and convenient to operate, has good catalytic activity, stability and glucose sensing response characteristics, and the obtained product is adhered to the surface of the copper foil and can directly catalyze and monitor the blood glucose concentration. However, the product obtained by the method needs to take copper foil as a matrix, so that the application range is narrow. The Chinese patent application with publication number of CN104897726A discloses a method for preparing a nano copper oxide gas-sensitive material by a sol-gel method. The obtained nano copper oxide product is uniform, and the sensitivity to low-concentration gas can be obviously improved, but the method needs high-temperature treatment. Chinese patent application publication No. CN103420408A discloses a method for preparing nano copper oxide in solid phase. The method takes lignosulfonate as a template, and adopts the solid phase reaction of copper salt and sodium hydroxide/potassium hydroxide to remove the template through calcining at different temperatures, so as to obtain nano copper oxide, thereby realizing the controllable technology of the nano material. However, the method can only prepare uniform particles by calcining at a higher reaction temperature.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of harsh reaction conditions and uniform products of the nanocomposite in the prior art.
In order to solve the technical problems, the invention provides a cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof. The method disclosed by the invention is simple in process, safe and reliable, high in purity of the obtained product, low in cost and easy to prepare on a large scale; cu obtained by the preparation 2 The O@CuO-RGO multi-stage nanocomposite has outstanding advantages in the application of detecting nitrogen dioxide gas; by changing the concentration, reaction time and the like of each component in the reaction reagent, different Cu with different morphology can be obtained 2 Cu of GO composition with different degrees of reduction in O/CuO ratio 2 O@CuO-RGO multi-stage nanocomposite.
A first object of the present invention is to provide a Cu 2 The preparation method of the O@CuO-RGO nanocomposite comprises the following steps,
s1, adding graphene oxide into cuprous oxide dispersion liquid under alkaline condition to obtain mixed liquid; the mass concentration of the cuprous oxide dispersion liquid is 1-5mg/mL; the pH of the alkaline condition is 9-14;
s2, stirring and reacting the mixed solution in the step S1 to obtain the Cu 2 O@CuO-RGO nanocomposite.
In one embodiment of the present invention, in step S1, the pH adjustor is sodium hydroxide and/or potassium hydroxide.
In one embodiment of the invention, in step S1, the molar concentration of the regulator is 0.01-1mol/L.
In one embodiment of the invention, in the step S1, the mass concentration of graphene oxide in the mixed solution is 0.05-5mg/mL.
In one embodiment of the invention, in step S2, the temperature of the reaction is 0-39 ℃; the reaction time is 5min-24h.
In one embodiment of the invention, in step S2, the stirring speed is 50-1500r/min.
In one embodiment of the invention, the method further comprises separating the Cu from the reaction solution 2 The O@CuO-RGO nanocomposite material comprises the steps of suction filtration, washing and drying; the washing is performed by using deionized water and ethanol.
In one embodiment of the invention, the washing is with deionized water and ethanol.
A second object of the present invention is to provide Cu prepared by the method 2 O@CuO-RGO nanocomposite.
A third object of the present invention is to provide a Cu as described 2 Application of O@CuO-RGO nanocomposite in detecting nitrogen dioxide.
The principle of the invention is as follows: cuprous oxide (Cu) 2 O) is oxidized to copper hydroxide in an alkaline aqueous solution of Graphene Oxide (GO), the lost electrons simultaneously reduce Graphene Oxide (GO) to Reduced Graphene Oxide (RGO) in situ, followed by Cu (OH) 2 Further dehydrating to form CuO nanocrystalline, assembling the copper oxide nanocrystalline along with the progress of the reaction to form CuO nanosheet flower, and in-situ compounding with RGO to obtain Cu 2 O@CuO-RGO multi-stage nano-plate flower structure.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The preparation method adopts a liquid phase synthesis method to stir and react at normal temperature to obtain Cu 2 O@CuO-RGO multistage nano composite gas-sensitive material prepared by Cu 2 The etching self-assembly process of O in alkaline solution is converted into CuO with a multi-stage structure, and meanwhile, GO is reduced in situ to form Cu with a multi-stage structure support 2 The O@CuO-RGO multi-stage nano-flake composite material has the advantages of extremely simple process, simple raw materials, higher product purity, higher yield and low cost, and can meet the requirement of large-scale production.
(2) The preparation method of the invention can obtain Cu with different morphologies, different component proportions and different RGO reduction degrees by adjusting the concentration of each component of the precursor solution, the reaction temperature, the reaction time and the like 2 The O@CuO-RGO multi-stage nanocomposite can meet the requirements of multiple purposes.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 shows Cu in example 1 of the present invention 2 SEM image of O@CuO-RGO multi-stage nano-flake composite material;
FIG. 2 is a diagram showing Cu in example 1 of the present invention 2 XRD pattern of O@CuO-RGO multi-stage nano-flake composite material;
FIG. 3 is a diagram showing Cu in example 2 of the present invention 2 SEM image of O@CuO-RGO multi-stage nano-flake composite material;
FIG. 4 shows Cu in example 3 of the present invention 2 SEM image of O@CuO-RGO multi-stage nano-flake composite material;
FIG. 5 shows Cu in test example 1 of the present invention 2 O@CuO-RGO multi-stage nano-flake composite material pair NO 2 A transient response recovery curve for the gas;
FIG. 6 shows Cu in test example 2 of the present invention 2 O@CuO-RGO multi-stage nano-flake composite material pair NO 2 Transient response recovery curve of gas.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Cu (copper) alloy 2 The preparation method of the O@CuO-RGO nanocomposite comprises the following steps:
(1) 0.3g of cuprous oxide was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide is added into the dispersion liquid obtained in the step (1) and stirred magnetically and mixed uniformly, and the pH value is 12.83;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) The reaction vessel filled with the precursor liquid is placed at normal temperature and stirred at the rotating speed of 700r/min for reaction for 5 hours, and the obtained product is processedRepeatedly cleaning with deionized water and ethanol, and drying to obtain Cu 2 O@CuO-RGO multi-stage nano-flake composite material.
Cu obtained in this example 2 The morphology of the O@CuO-RGO multi-stage nano flake flower composite material is shown in figure 1, the XRD of a test product is shown in figure 2, the obtained material is a composite of cuprous oxide and cupric oxide, the cuprous oxide is self-assembled by the original granular shape through etching to form a cuprous oxide@cupric oxide multi-stage nano flake flower structure, and the graphene oxide nano flake is supported to form a fluffy structure, so that the comparison area is increased, and the gas adsorption and gas sensitivity improvement are facilitated.
Example 2
Cu (copper) alloy 2 The preparation method of the O@CuO-RGO nanocomposite comprises the following steps:
(1) 0.5g of cuprous oxide was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide is added into the dispersion liquid obtained in the step (1) and stirred magnetically and mixed uniformly, and the pH value is 12.83;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) Placing the reaction vessel containing the precursor liquid at normal temperature, stirring at 700r/min for reaction for 5h, filtering the obtained product, repeatedly cleaning with deionized water and ethanol, and drying to obtain Cu 2 O@CuO-RGO multi-stage nano-flake composite material.
Cu obtained in this example 2 The O@CuO-RGO multi-stage nano flake flower composite material has the morphology shown in figure 3, cuprous oxide is etched and self-assembled from the original granular surface part to form a cuprous oxide@cupric oxide multi-stage nano flake flower structure, and the graphene oxide nano flakes are supported to form a cladding structure, so that the nano flake flower structure is obvious, but the etching self-assembly degree of the surface is small due to the large addition amount of the cuprous oxide.
Example 3
Cu (copper) alloy 2 The preparation method of the O@CuO-RGO nanocomposite comprises the following steps:
(1) 0.2g of cuprous oxide was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide is added into the dispersion liquid obtained in the step (1) and stirred magnetically and mixed uniformly, and the pH value is 12.83;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) Placing the reaction vessel containing the precursor liquid at normal temperature, stirring at 700r/min for reaction for 5h, filtering the obtained product, repeatedly cleaning with deionized water and ethanol, and drying to obtain Cu 2 O@CuO-RGO multi-stage nano-flake composite material.
Cu obtained in this example 2 The O@CuO-RGO multi-stage nano-sheet flower composite material has the morphology shown in figure 4, cuprous oxide is self-assembled by original particles through etching to form a cuprous oxide@cupric oxide multi-stage nano-sheet structure, and a graphene oxide nano-sheet is supported to form a coating structure.
Example 4
Cu (copper) alloy 2 The preparation method of the O@CuO-RGO nanocomposite comprises the following steps:
(1) 0.4g of cuprous chloride was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) Adding 20mL (1 mol/L) of sodium hydroxide/potassium hydroxide into the dispersion liquid obtained in the step (1) and magnetically stirring and mixing uniformly, wherein the pH value is 13.78;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) Placing a reaction container filled with precursor liquid at normal temperature, stirring at 700r/min for reaction for 5h, filtering, repeatedly cleaning with deionized water and ethanol, and drying to obtain Cu 2 O@CuO-RGO multi-stage nano-flake composite material. Cu obtained in this example 2 The O@CuO-RGO multi-stage nano-sheet flower composite material forms an RGO coated cuprous oxide@copper oxide multi-stage nano-sheet flower structure.
Comparative example 1
(1) 0.1g of cuprous oxide powder was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) Adding 1mL (1 mol/L) of sodium hydroxide/potassium hydroxide into the ultrapure water obtained in the step (1) and magnetically stirring to dissolve, wherein the pH is 8.15;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) And (3) placing the reaction container filled with the precursor liquid at normal temperature, stirring at a rotating speed of 700r/min for reaction for 20 hours, and repeatedly washing and drying the obtained product by suction filtration, deionized water and ethanol to obtain the product material.
The Cu obtained in this comparative example was obtained by adding less sodium hydroxide/potassium hydroxide, although the reaction time was prolonged 2 The O@CuO-RGO composite material has a multi-stage nano-lamellar flower structure which is difficult to observe.
Comparative example 2
(1) 0.05g of cuprous oxide powder was dispersed in 100mL of ultrapure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide was added to the ultrapure water obtained in the step (1) and dissolved by magnetic stirring, and the pH was 12.83;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) And (3) placing the reaction container filled with the precursor liquid at normal temperature, stirring at a rotating speed of 700r/min for reaction for 5 hours, and repeatedly washing and drying the obtained product by suction filtration, deionized water and ethanol to obtain the product material.
The RGO coated copper oxide nano sheet material obtained in the comparative example has insufficient reduction degree of RGO due to smaller addition amount of cuprous oxide.
Comparative example 3
(1) 0.7g commercial cuprous oxide powder was dispersed in 100mL ultra pure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide was added to the ultrapure water obtained in the step (1) and dissolved by magnetic stirring, and the pH was 12.83;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) And (3) placing the reaction container filled with the precursor liquid at normal temperature, stirring at a rotating speed of 700r/min for reaction for 5 hours, and repeatedly washing and drying the obtained product by suction filtration, deionized water and ethanol to obtain the product material.
Because the addition amount of the cuprous oxide is large, the amount of the sodium hydroxide is insufficient, the reaction does not completely proceed, and the obtained product is that only a small amount of copper oxide nano-sheets and a large amount of cuprous oxide powder are mixed with RGO.
Comparative example 4
(1) Dispersing 0.1mM copper chloride in 100mL of ultrapure water by magnetic stirring;
(2) 17.5mL (1 mol/L) of sodium hydroxide/potassium hydroxide is added into the ultrapure water obtained in the step (1) and dissolved by magnetic stirring, and the pH is 12.80;
(3) Then adding 5mL (10 mg/mL) of graphene oxide, and continuously stirring to obtain a mixed solution;
(4) And (3) placing the reaction container filled with the precursor liquid at normal temperature, stirring and reacting for 8 hours at a rotating speed of 700r/min, and repeatedly cleaning and drying the obtained product by suction filtration, deionized water and ethanol to obtain the GO-coated copper oxide material.
The GO-coated copper oxide material obtained by the embodiment has various shapes such as nanowires, nanosheets and the like, and the GO is not reduced or has too weak reduction degree, so that the GO-coated copper oxide material is extremely poor in conductivity and is not suitable for being used as a gas sensing material.
Test example 1
Cu obtained in example 1 2 The O@CuO-RGO multistage nano-flake flower composite material is dripped on the surface of an interdigital electrode and dried, then a dynamic gas-sensitive test system is connected to test the gas-sensitive performance of the composite material at room temperature, the test voltage is set to be 1V, the dry air is used as background gas and diluent gas, and target gas (NO 2 ) The device was previously purged with dry air while continuing to record its current-time profile until the baseline was leveled, and NO was added at a concentration of 5ppm 2 After the gas is introduced into the test chamber for 60S, the process is repeated 6 times by purging 600S with dry air through the response formula s= (I) t -I 0 )/I 0 Calculate its response, where S isResponse value, I t For the current value of the device in the target gas, I 0 To dry the current values of the devices in air, a response-time curve as shown in FIG. 5 was obtained, which was plotted against NO 2 The response sensitivity of (2) is high and reaches 140.
Test example 2
Cu obtained in example 2 2 The O@CuO-RGO multistage nano-flake flower composite material is dripped on the surface of an interdigital electrode and dried, then a dynamic gas-sensitive test system is connected to test the gas-sensitive performance of the composite material at room temperature, the test voltage is set to be 1V, the dry air is used as background gas and diluent gas, and target gas (NO 2 ) The device was previously purged with dry air while continuing to record its current-time profile until the baseline was leveled, and NO was added at a concentration of 5ppm 2 After the gas is introduced into the test chamber for 60S, the process is repeated 6 times by purging 600S with dry air through the response formula s= (I) t -I 0 )/I 0 Calculate its response, where S is the response value, I t For the current value of the device in the target gas, I 0 To dry the current values of the devices in air, a response-time curve as shown in FIG. 6 was obtained, which was plotted against NO 2 The response sensitivity of (2) is relatively high, about 22.
Test example 3
Cu obtained in comparative example 2 2 The O@CuO-RGO composite material is dripped on the surface of an interdigital electrode for drying, then a dynamic gas-sensitive test system is connected to test the gas-sensitive performance of the interdigital electrode at room temperature, the test voltage is set to be 1V, the dry air is used as background gas and diluent gas, and target gas (NO 2 ) The device was previously purged with dry air while continuing to record its current-time profile until the baseline was leveled, and NO was added at a concentration of 5ppm 2 After the gas is introduced into the test chamber for 60S, the process is repeated 6 times by purging 600S with dry air through the response formula s= (I) t -I 0 )/I 0 Calculate its response, where S is the response value, I t For the current value of the device in the target gas, I 0 For drying the current value of the device in air, the obtained response-time curve is compared with NO 2 The gas response is very weak.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (8)

1. Cu (copper) alloy 2 The preparation method of the O@CuO-RGO nanocomposite is characterized by comprising the following steps of,
s1, adding graphene oxide into cuprous oxide dispersion liquid under alkaline condition to obtain mixed liquid; the mass concentration of the cuprous oxide dispersion liquid is 1-5mg/mL; the pH of the alkaline condition is 9-14; the mass concentration of graphene oxide in the mixed solution is 10mg/mL;
s2, stirring and reacting the mixed solution in the step S1 to obtain the Cu 2 O@CuO-RGO nanocomposite; the temperature of the reaction is 0-39 ℃; the reaction time is 5min-24h.
2. Cu according to claim 1 2 The preparation method of the O@CuO-RGO nanocomposite is characterized in that in the step S1, the pH regulator is sodium hydroxide and/or potassium hydroxide.
3. Cu according to claim 2 2 The preparation method of the O@CuO-RGO nanocomposite is characterized in that in the step S1, the molar concentration of the regulator is 1mol/L.
4. Cu according to claim 1 2 The preparation method of the O@CuO-RGO nanocomposite is characterized in that in the step S2, the stirring rotating speed is 50-1500r/min.
5. Cu according to claim 1 2 The preparation method of the O@CuO-RGO nanocomposite is characterized by further comprising the step of separating the Cu from a reaction solution 2 The O@CuO-RGO nanocomposite material comprises the steps of suction filtration, washing and drying; the washing is performed by using deionized water and ethanol.
6. Cu according to claim 1 2 The preparation method of the O@CuO-RGO nanocomposite is characterized by comprising the step of washing by adopting deionized water and ethanol.
7. Cu prepared by the method of any one of claims 1-6 2 O@CuO-RGO nanocomposite.
8. The Cu of claim 7 2 Application of O@CuO-RGO nanocomposite in detecting nitrogen dioxide.
CN202210311193.7A 2022-03-28 2022-03-28 Cuprous oxide@copper oxide-graphene nanocomposite and preparation and application thereof Active CN114853051B (en)

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