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Preparation method of ZnO quantum dot/graphene oxide composite material

A composite material, graphene technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of uncontrollable experimental process, high preparation energy consumption, environmental pollution, etc., to achieve good gas-sensing detection potential, strong interaction, and low energy consumption. Effect

Active Publication Date: 2017-05-31
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, the unique nanocomposite materials prepared by compounding zinc oxide quantum dots on graphene oxide have attracted more attention, but there are still some problems: high energy consumption needs to be prepared at high temperature, the experimental process is uncontrollable, and the safety is low ; The method is complicated, the cost is high, and the experimental process pollutes the environment; it cannot be used in explosive, flammable, toxic and harmful environments

Method used

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Experimental program
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Effect test

preparation example Construction

[0024] The preparation method of a kind of ZnO quantum dot / graphene oxide composite material of the present invention adopts the following steps:

[0025] A) Mix natural graphite powder, 98% concentrated sulfuric acid, phosphorus pentoxide and potassium disulfide evenly, place in a closed reaction vessel, stir at 60-100°C for 4-6h, then carry out vacuum filtration and water washing until Wash the reacted natural graphite powder to neutrality, then place it at room temperature and dry it for 18-36h to obtain a pre-oxidized graphite sample;

[0026] B) uniformly disperse the pre-oxidized graphite sample obtained in step A) in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, and after fully stirring for 1-4h, dilute the reacted liquid and slowly Add hydrogen peroxide, stir for 5-20min, let it stand overnight, and take the sediment at the bottom;

[0027] C) take the precipitate obtained in step B) and successively wash with ...

Embodiment 1

[0032] Embodiment 1: a kind of preparation method of ZnO quantum dot / graphene oxide composite material, this preparation method adopts the following steps:

[0033] A) Evenly mix natural graphite powder, 98% concentrated sulfuric acid, phosphorus pentoxide and potassium disulfide at a ratio of 1:10:0.5:0.5, place in a closed reaction vessel, and stir at 60°C for 4 hours Carry out decompression suction filtration water washing, until the natural graphite powder after the reaction is washed to neutrality, then it is placed at room temperature and dried 18h, obtains pre-oxidized graphite sample;

[0034] B) Evenly disperse the pre-oxidized graphite sample obtained in step A) in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, stir thoroughly for 1 hour, dilute the reacted liquid, and slowly add hydrogen peroxide , stirred for 5 minutes, stood overnight, took the bottom sediment, and added the pre-oxidized graphite sample, con...

Embodiment 2

[0038] Embodiment 2: a kind of preparation method of ZnO quantum dot / graphene oxide composite material, this preparation method adopts the following steps:

[0039] A) Evenly mix natural graphite powder, 98% concentrated sulfuric acid, phosphorus pentoxide and potassium disulfide at a ratio of 1:30:0.75:0.75, place in a closed reaction vessel, and stir at 80°C for 5 hours Carry out decompression suction filtration water washing, until the natural graphite powder after the reaction is washed to neutrality, then it is placed at room temperature and dried 22h, obtains pre-oxidized graphite sample;

[0040] B) Evenly disperse the pre-oxidized graphite sample obtained in step A) in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, stir fully for 2.5 hours, dilute the reacted liquid, and slowly add Hydrogen peroxide, stir for 13min, let it stand overnight, take the bottom sediment, add pre-oxidized graphite sample, concentrated s...

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Abstract

The invention relates to a preparation method of a ZnO quantum dot / graphene oxide composite material, and belongs to the field of graphene oxide composite material. According to the preparation method, improved Hummers method is adopted to prepare graphene oxide, a graphene oxide sample is dispersed in a methanol solution in a three-necked flask via ultrasonic dispersion, the three-necked flask is delivered into a thermostat water bath, magnetic stirring is carried out, an alcoholic solution of anhydrous zinc acetate and an aqueous solution of hexamethylenetetramine are added using microsyringes slowly and dropwise, reaction is carried out for a preset period of time, an obtained product is subjected to centrifugation and washing for a plurality of times, and an obtained solution is filtered and dried so as to obtain the ZnO quantum dot / graphene oxide composite material. The ZnO quantum dot / graphene oxide composite material is prepared via water bath at a low temperature; energy consumption is low; experiment is controllable; the preparation method is simple and convenient; cost is low; experimental process is green, and is friendly to the environment; relatively high interaction effect is achieved; better gas sensitive detection potential is achieved; and the ZnO quantum dot / graphene oxide composite material is suitable to be used at toxic and harmful environment with explosiveness and flammability.

Description

technical field [0001] The invention relates to a method for preparing a graphene oxide composite material, more specifically, a method for preparing a ZnO quantum dot / graphene oxide composite material. Background technique [0002] Nanocomposites are widely used in the fields of chemistry, optics and electricity because of their excellent comprehensive properties, especially the designability of their properties. In recent years, nanocomposites have received more and more attention. [0003] As a commonly used semiconductor, zinc oxide is a typical metal oxide. In addition to being used as a chemical additive, zinc oxide is used in plastics, rubber, etc., and has excellent room temperature luminescence performance, and is used in thin-film transistors and light-emitting diodes in the semiconductor field. Compared with traditional zinc-based materials, zinc oxide quantum dots have better photostability, larger specific surface area, larger surface activity and stronger ads...

Claims

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Application Information

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IPC IPC(8): C01G9/02
CPCC01G9/02C01P2004/80
Inventor 王秉林伟明万军民彭志勤胡智文
Owner ZHEJIANG SCI-TECH UNIV
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