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Preparation method of ZnO quantum dot/graphene oxide composite material

A composite material, graphene technology, applied in chemical instruments and methods, carbon compounds, zinc oxide/zinc hydroxide, etc., can solve the problems of long experimental period, complex method, low safety, etc., and achieve simple and experimental methods. Process controllable, high safety 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 preparation of unique nanocomposites by compounding zinc oxide quantum dots on graphene oxide has attracted more attention, but there are still some problems in the current preparation method: long experimental period, complicated method, high cost, and environmental pollution during the experimental process ; High energy consumption is required for preparation at high temperature, the experimental process is uncontrollable, and the safety is low; it cannot be used in explosive, flammable, toxic and harmful environments

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0021] A kind of ZnO quantum dot / graphene oxide composite material preparation method of the present invention adopts the following steps:

[0022] 1) Evenly disperse natural graphite raw materials in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, stir for 1-4 hours, then dilute the reacted liquid, slowly add hydrogen peroxide, and stir for 5-20 minutes , standing overnight to obtain a precipitate;

[0023] 2) The precipitate obtained in step 1) was sequentially washed with hydrochloric acid and deionized water at a speed of 4500-6000r / min for 3-8min, until the pH of the supernatant after centrifugation was 4-7, and the centrifuged product was obtained;

[0024] 3) Dialyze the centrifuged product obtained in step 2) with a dialysis bag for 1-3 weeks, then sonicate for 3-5 hours to obtain an aqueous solution of graphite oxide refining, dry at 40-60°C for 36-72 hours, and obtain traditional graphite oxide alkene sample; ...

Embodiment 1

[0027] Embodiment 1: a kind of ZnO quantum dot / graphene oxide composite material preparation method, this preparation method adopts the following steps:

[0028] 1) Evenly disperse natural graphite raw materials in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, stir for 1 hour, then dilute the reacted liquid, slowly add hydrogen peroxide, stir for 5 minutes, and let stand overnight , to obtain a precipitate, the weight ratio between the added natural graphite powder, concentrated sulfuric acid, potassium permanganate and hydrogen peroxide is 1:10:2:3;

[0029] 2) The precipitate obtained in step 1) was sequentially washed with hydrochloric acid and deionized water at a speed of 4500r / min for 3 minutes, until the pH of the supernatant after centrifugation was 4, and the centrifuged product was obtained;

[0030] 3) The centrifuged product obtained in step 2) was dialyzed with a dialysis bag for 1 week, and then ultrasonic...

Embodiment 2

[0032] Embodiment 2: a kind of ZnO quantum dot / graphene oxide composite material preparation method, this preparation method adopts the following steps:

[0033] 1) Evenly disperse the natural graphite raw material in 98% concentrated sulfuric acid, add potassium permanganate and deionized water under acidic conditions, and dilute the reacted liquid after stirring for 2.5 hours, slowly add hydrogen peroxide, stir for 13 minutes, and let stand overnight , to obtain a precipitate, the weight ratio between the added natural graphite powder, concentrated sulfuric acid, potassium permanganate and hydrogen peroxide is 1:55:4:4.5;

[0034] 2) The precipitate obtained in step 1) was sequentially washed with hydrochloric acid and deionized water at a speed of 5200r / min for 6 minutes, until the pH of the supernatant after centrifugation was 5.5, and the centrifuged product was obtained;

[0035] 3) Dialyze the centrifuged product obtained in step 2) with a dialysis bag for 2 weeks, then...

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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, graphene oxide is prepared directly, a graphene oxide sample is dispersed in an alcohol solution via ultrasonic dispersion, an obtained mixture 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 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 preparation method is capable of optimizing liquid-phase oxidation process, shortening preparation period, reducing cost, and obtaining graphene oxide with excellent structure performance; relatively high interaction effect between the ZnO quantum dot / graphene oxide composite material with gas molecules 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 composite material, and more specifically, relates to 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): C01G9/02C01B32/198
CPCC01G9/02
Inventor 王秉林伟明万军民彭志勤胡智文
Owner ZHEJIANG SCI-TECH UNIV
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