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Compound nano material of graphene nano slice and WS2 and preparation method thereof

A kind of graphene nanosheet, composite nanomaterial technology

Inactive Publication Date: 2011-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the synthesis of graphene / WS assisted by L-cysteine 2 There are no public reports on composite nanomaterials and their preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Preparation of graphite oxide nanosheets: Disperse 1.25mmol (0.015g) of graphite powder into 20mL of concentrated sulfuric acid in an ice bath at 0°C, and add 0.03g of KMnO 4 , the added KMnO 4 The mass of graphite is 3 times that of graphite, stir for 30 minutes, the temperature rises to about 30°C, add 45ml of deionized water, stir for 20 minutes, add 10ml of 30% H 2 o 2 , stirred for 5 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0020]2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 6.25mmol of L-cysteine ​​and stir evenly, the ratio of L-cysteine ​​to tungstic acid is 5.0: 1, then add the graphite oxide nanosheets prepared by 1.25mmol (0.015g) of graphite in step 1) into the solution, the amount of the used graphite raw material and the mass ratio of tungstic acid in the solution are 1: 1, ultrasonic Tre...

Embodiment 2

[0024] 1) Preparation of graphite oxide nanosheets: Disperse 2.5mmol (0.03g) of graphite powder into 25mL of concentrated sulfuric acid in an ice bath at 0°C, and add KMnO 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 40 minutes, the temperature rises to about 33 ° C, add 50ml of deionized water, stir for 25 minutes, add 12ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 5-10 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0025] 2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 7.5mmol of L-cysteine ​​and stir evenly, wherein the ratio of L-cysteine ​​to tungstic acid is 6 : 1, then the graphite oxide nanosheets prepared by the graphite of 2.5mmol (0.03g) in step 1) are added in the solution, the amount of the graphite raw material used is 2: 1 with the mass ratio of tungstic...

Embodiment 3

[0028] 1) Preparation of graphite oxide nanosheets: Disperse 5.0 mmol (0.06 g) of graphite powder into 25 mL of concentrated sulfuric acid in an ice bath at 0 °C, and add KMnO 4 , the added KMnO 4 The mass of graphite is 4 times that of graphite, stir for 50 minutes, the temperature rises to about 35°C, add 50ml of deionized water, stir for 30 minutes, add 20ml of H2O with a mass concentration of 30% 2 o 2 , stirred for 15 minutes, centrifuged, and repeatedly washed with a mass concentration of 5% HCl solution, deionized water and acetone to obtain graphite oxide nanosheets;

[0029] 2) Dissolve 1.25mmol of tungstic acid in 63ml of deionized water to form a 0.02M solution, add 15mmol of L-cysteine ​​and stir well, the ratio of L-cysteine ​​to tungstic acid is 12:1 , then the graphite oxide nanosheets prepared by 5.0mmol (0.06g) of graphite in step 1) are added in the solution, the amount of the graphite raw material used is 4:1 with the mass ratio of tungstic acid in the sol...

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Abstract

The invention discloses a compound nano material of graphene nano slice and tungsten disulfide (WS2), and a synthesis method and a preparation method thereof. The compound material is formed by mixing graphene and a WS2 nano material in a mass ratio of (1 to 1)-(4 to 1). The preparation method comprises the following steps of: preparing an oxidized graphite nano slice from graphite by a chemical oxidization method; then dissolving tungstic acid into deionized water so as to form 0.02 to 0.07M of solution; adding L-cysteine serving as a sulfur source and a reduction agent, wherein the mass ratio of the L-cysteine to the tungstic acid is (5 to 1)-(12 to 1); adding the oxidized graphite nano slice into the solution, and ultrasonically treating so that the oxidized graphite nano slice can be fully dispersed in the hydrothermal reaction solution; transferring the mixture into a hydrothermal reaction kettle and sealing; and synthesizing by a one-step hydrothermal method to obtain the compound nano material of graphene and WS2, wherein the mass ratio of the graphene nano slice to the WS2 is (1 to 1)-(4 to 1). The method has the characteristics of mild reaction condition and simple process. The compound nano material of graphene and WS2 synthesized by the method can be widely used as electrode materials of new energy batteries, high-performance national lubricants, catalyst carriers and the like.

Description

technical field [0001] The invention relates to composite nanomaterials and their preparation, in particular to graphene nanosheets and WS 2 The composite nanomaterial and the preparation method thereof belong to the field of inorganic composite nanomaterial, new energy material and preparation thereof. Background technique [0002] Graphene nanosheets have many unique physical, chemical and mechanical properties due to their unique two-dimensional nanosheet structure, which has important scientific research significance and broad application prospects. The discovery of graphene materials won the Nobel Prize in 2010, which stimulated people's great interest in the research of graphene materials. Graphene nanosheets have extremely high specific surface area, high electrical and thermal conductivity, and super mechanical properties. Recently, the application of graphene nanosheets as micro-nano electronic devices, electrode materials for new energy batteries, solid lubricant...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈卫祥陈涛常焜马琳
Owner ZHEJIANG UNIV
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