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Preparation method of graphene/molybdenum disulfide/cadmium sulfide composite sensing material

A molybdenum disulfide and composite material technology, which is applied in the material field to achieve the effects of convenient operation, strong thermal stability and environmental friendliness

Inactive Publication Date: 2018-09-14
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the related reports are limited to field-effect transistors and optical applications.

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  • Preparation method of graphene/molybdenum disulfide/cadmium sulfide composite sensing material
  • Preparation method of graphene/molybdenum disulfide/cadmium sulfide composite sensing material
  • Preparation method of graphene/molybdenum disulfide/cadmium sulfide composite sensing material

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Embodiment 1

[0023] 5 grams of graphite powder and 6 grams of potassium nitrate were put into 230 milliliters of concentrated sulfuric acid for gentle mechanical stirring. 20 g of potassium permanganate was gradually added to the stirred mixture, which was maintained at 40°C for 6 hours. Then add 160 milliliters of distilled water to mix and dilute, keep at 70°C for 30 minutes, then dilute with 500 milliliters of distilled water, then add 6 milliliters of 30% hydrogen peroxide in the mixture to form a brown-yellow product. The mixture was centrifuged and washed with distilled water to remove metal ions and acids. Afterwards, the mixture was dialyzed for a week, and the graphene oxide samples were vacuum-dried at 60°C.

[0024] Graphene oxide-molybdenum disulfide composites were synthesized by hydrothermal method. Weigh 0.1 g of graphene oxide and add 80 ml of distilled water for ultrasonic dispersion. Then, sodium molybdate and thiourea were weighed and added to the above mixture at a m...

Embodiment 2

[0028] 3 grams of graphite powder and 5 grams of potassium nitrate were put into 180 milliliters of concentrated sulfuric acid for gentle mechanical stirring. 18 g of potassium permanganate were gradually added to the stirred mixture, which was maintained at 40°C for 12 hours. Then add 180 milliliters of distilled water to mix and dilute, keep at 70° C. for 60 minutes, then dilute with 500 milliliters of distilled water, then add 6 milliliters of 30% hydrogen peroxide in the mixture to form a brown-yellow product. The mixture was centrifuged and washed with distilled water to remove metal ions and acids. Afterwards, the mixture was dialyzed for two weeks, and the graphene oxide samples were vacuum-dried at 60°C.

[0029] Graphene oxide-molybdenum disulfide composites were synthesized by hydrothermal method. Weigh 0.15 g of graphene oxide and add 100 ml of distilled water for ultrasonic dispersion. Then, sodium molybdate and thiourea were weighed and added to the above mixtu...

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Abstract

The invention discloses a preparation method of a graphene / molybdenum disulfide / cadmium sulfide composite sensing material. The preparation method includes: preparing graphene oxide; adopting a hydrothermal process to synthesize a graphene oxide-molybdenum disulfide composite material; adopting a hydrothermal process to synthesize the graphene-molybdenum disulfide-cadmium sulfide composite material. Compared with the prior art, the preparation method has the advantages that sensing performance of the graphene-molybdenum disulfide-cadmium sulfide composite material prepared by the method is excellent, and responding time and restoring time to low-concentration NO2 gas are less than 30s. The composite sensing material obtained by applying the hydrothermal process is orderly in structure andhigh in thermostability; a simple method is applied to effectively reduce graphene oxide, and novel graphene / molybdenum disulfide / cadmium sulfide composite heterojunctions are formed. The method is environment-friendly, convenient for operation and low in cost. Therefore, the preparation method has the advantages that conventional methods do not have and has potential in large-scale production.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a preparation method of a graphene / molybdenum disulfide / cadmium sulfide composite sensing material. Background technique [0002] At present, with the development of industry and the increasing number of motor vehicles, nitrogen dioxide has become one of the main pollutants that endanger the ozone layer and acid rain, and the trace level of nitrogen dioxide is enough to damage the human respiratory system and lung tissue. The U.S. Environmental Protection Agency (EPA) has determined ambient air quality standards to be 53ppb (annual average) and 100ppb (single-hour average). ppb level NO 2 The detection and measurement of detection and measurement are of great significance to environmental protection and human health. Currently, various techniques have been used to detect trace NO 2 , including electrochemical, optical, and chemiresistive sensors. However, many studies hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01G39/06C01B32/184C01G11/02
CPCC01B32/184C01G11/02C01G39/06C01P2004/80G01N27/125G01N27/127
Inventor 邵绍峰车雷声赖敏陈鑫黄申备王云飞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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