Preparation method of tin disulfide/graphene/tin dioxide ternary composite gas-sensing material for nitrogen dioxide gas sensor

A nitrogen dioxide, tin disulfide technology, applied in chemical instruments and methods, tin oxide, graphene and other directions, can solve the problems of poor selectivity, high working temperature, high detection limit, and achieve the effect of improving sensitivity

Active Publication Date: 2020-05-26
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to solve the existing semiconductor material for NO 2 Due to the problems of low gas sensitivity, high detection limit, poor selectivity and high working temperature, a method for NO 2 SnS for Gas Sensors 2 / Graphene / SnO 2 Preparation method of ternary composite gas sensitive material

Method used

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  • Preparation method of tin disulfide/graphene/tin dioxide ternary composite gas-sensing material for nitrogen dioxide gas sensor
  • Preparation method of tin disulfide/graphene/tin dioxide ternary composite gas-sensing material for nitrogen dioxide gas sensor
  • Preparation method of tin disulfide/graphene/tin dioxide ternary composite gas-sensing material for nitrogen dioxide gas sensor

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specific Embodiment approach 1

[0026] Specific Embodiment 1: The preparation method of the tin disulfide / graphene / tin dioxide ternary composite gas-sensitive material used for the nitrogen dioxide gas sensor in this embodiment is carried out according to the following steps:

[0027] 1. SnS 2 Preparation of nanosheets: under the protection of an inert atmosphere, add tin tetrachloride pentahydrate, oleic acid and octadecene to a three-necked bottle, the ratio of tin tetrachloride pentahydrate, oleic acid and octadecene is 0.37g: 1ml: 2ml, stir and remove oxygen and water at 100°C for 1 hour, then raise the temperature to 280°C at a heating rate of 6°C / min, add 5ml of sulfur oleylamine solution, the concentration of sulfur in the sulfur oleylamine solution is 0.2mmol / ml, react at a constant temperature of 280°C for 30 minutes, after the reaction, wash with ethanol and cyclohexane centrifugally, collect the product by centrifugal and disperse it in water, add dilute hydrochloric acid, adjust the pH value to ...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is that dilute hydrochloric acid is used in step one to adjust SnS 2 The ethanol solution has a pH of 3. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, ether is added each time, SnS 2 The volume ratio of aqueous solution to ether is 1:2. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a tin disulfide / graphene / tin dioxide ternary composite gas sensing material for a nitrogen dioxide gas-sensitive sensor, relates to a gas sensor material and a preparation method thereof, belongs to the technical field of gas detection, and aims to solve the problems of low sensitivity, high detection limit, poor selectivity and high working temperature of existing semiconductor materials for NO2 gas. The method is as follows: 1. preparation of SnS2 nanosheets; 2. compounding of graphene and SnO2 quantum wires; 3. preparation of a SnS2 / graphene / SnO2 composite sensing film, to be more specific, firstly coating a ceramic piece with a gold interdigitated electrode with an ethanol solution of graphene / SnO2 quantum wires, then coating the surfaceof the ethanol solution of the graphene / SnO2 quantum wires with an ethanol solution of SnS2 for reacting, and aging to obtain the material. The method further integrates application ideas of two two-dimensional materials in the field of NO2 gas sensors, and constructs the SnS2 / graphene / SnO2 ternary composite material to realize a high sensitivity and low detection limit gas sensitive response forthe NO2 gas at low temperature.

Description

technical field [0001] The invention relates to a gas sensor material and a preparation method thereof, through SnS 2 / Graphene / SnO 2 The preparation of ternary composite gas-sensing materials realizes NO 2 The highly sensitive detection of gas belongs to the technical field of gas detection. Background technique [0002] NO 2 It is a common polluting gas whose main sources are industrial production and automobile exhaust emissions. Only 10ppm of NO 2 It will cause damage to the human body, and the international standard stipulates NO 2 The annual safe concentration threshold is 53ppb; there is also a small amount of NO in the exhaled air of the human body 2 (ppb level), its abnormal concentration can be used as the basis for the diagnosis of certain diseases, therefore, no matter in the fields of industrial production, daily life and human disease detection, the ppb level NO 2 The gas detection market is in great demand, requiring high sensitivity, extremely low dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12C01G19/00C01B32/184C01B32/194C01G19/02
CPCC01G19/00C01G19/02G01N27/127
Inventor 王铀郑晟良
Owner HARBIN INST OF TECH
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