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Preparation method of gas sensitive material based on graphene/molybdenum disulfide composite

A gas-sensitive material, molybdenum disulfide technology, applied in the direction of material resistance, etc., can solve the problems of poor solubility of nanoparticles, and achieve the effects of improving gas-sensing performance, high selectivity and sensitivity, and simple preparation process

Inactive Publication Date: 2017-06-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current studies have found that intrinsic graphene gas sensor nanoparticles have poor solubility, only have high sensitivity to a few gases, and often need to be desorbed by heating, which limits the wide application of this type of gas sensor to a certain extent.

Method used

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  • Preparation method of gas sensitive material based on graphene/molybdenum disulfide composite
  • Preparation method of gas sensitive material based on graphene/molybdenum disulfide composite

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specific Embodiment approach 1

[0019] Specific Embodiment 1: In this embodiment, the molar ratio of molybdenum atoms to carbon atoms in the gas-sensitive material based on graphene / molybdenum disulfide composite is 1:1-5, molybdenum disulfide is wrapped on the outer surface of graphene, and molybdenum disulfide The number of layers is 5-20, and the distance between each layer is 0.62-0.65nm.

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that the molar ratio of molybdenum atoms to carbon atoms in the gas-sensitive material based on graphene / molybdenum disulfide composite is 1:3. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the distance between each layer is 0.64 nm. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a gas-sensitive material based on graphene / molybdenum disulfide composite, which relates to a method for preparing a gas-sensitive material. The invention aims to solve the technical problem that the intrinsic graphene gas sensor nanoparticles have high sensitivity to only a few gases. Molybdenum disulfide is wrapped on the outer surface of graphene in the material. Preparation method: 1. Cool concentrated sulfuric acid, add natural flake graphite, potassium permanganate, stir, then add a mixed solution composed of hydrogen peroxide and distilled water, centrifuge and wash, dissolve the precipitate in deionized water to obtain a solution; 2. Dissolve sodium molybdate, cysteine ​​and sodium hexadecylbenzenesulfonate in deionized water, add the solution obtained in step 1, put it into a reaction kettle, centrifugally clean it, and freeze-dry it to obtain the product. The composite material of the present invention has higher selectivity and sensitivity. The invention belongs to the field of preparation of gas sensitive materials.

Description

technical field [0001] The invention relates to a preparation method of a gas sensitive material. Background technique [0002] With the continuous improvement of people's quality of life requirements, people are increasingly concerned about environmental pollution, especially air pollution that poses a threat to human survival. Among them, NO 2 Gas is one of the pollutants in the atmosphere that are very harmful to the environment and human health, especially in recent years NO 2 The main source of gas——vehicle exhaust is growing at an astonishing rate every year, making NO 2 The monitoring of the environment has become particularly important, so timely and accurate knowledge of the NO in the environment and related pollution sources 2 The concentration of gas is of great significance to environmental monitoring and environmental protection. [0003] Although traditional semiconductor gas sensors are widely used, their high operating temperature (greater than 300°C) oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 矫维成牛越王荣国丁国民黄亦凡郝立峰杨帆徐忠海
Owner HARBIN INST OF TECH
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