NO2 gas sensitive element based on rGO-SnO2 nanometer composite material and preparation method thereof

A nanocomposite material and gas sensor technology, applied in the field of graphene-metal oxide composite gas sensor, can solve the problems of poor selectivity, high working temperature, low sensitivity, etc., and achieve good selectivity and stability, resistance The effect of low rate and good dispersion

Active Publication Date: 2019-09-17
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For current SnO 2 The working temperature of the gas sensor is higher, the sensitivity is lower, and the selectivity is poor. The present invention adopts a one-step hydrothermal method to combine rGO and SnO 2 complex to prepare rGO-SnO 2 nanocomposite material, and based on the composite material, NO 2 The gas sensing performance is significantly better than that of pure SnO 2 or rGO gas sensor

Method used

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  • NO2 gas sensitive element based on rGO-SnO2 nanometer composite material and preparation method thereof
  • NO2 gas sensitive element based on rGO-SnO2 nanometer composite material and preparation method thereof
  • NO2 gas sensitive element based on rGO-SnO2 nanometer composite material and preparation method thereof

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Embodiment 1

[0037] The present embodiment based on rGO-SnO 2 NO of nanocomposites 2 Gas sensor, its structure diagram is as follows figure 1 As shown, including base 1, platinum lead 2, rGO-SnO 2 Nanocomposite material coating 3, ceramic tube 4, heating wire 5, and gold electrode 6 are composed of six parts. The gold electrode 6 is wound on the surface of the ceramic tube 4 and welded to form a ceramic electrode. The platinum lead wire 2 is welded on the surface of the gold electrode 6 and heated Wire 5 traverses in ceramic tube 4, rGO-SnO 2 The nanocomposite material layer 3 is coated on the entire surface of the ceramic tube 4 and the gold electrode 6, and the heating wire 5 and the platinum lead 2 are sequentially welded on the base 1 to form an rGO-SnO 2 NO of nanocomposites 2 gas sensor.

[0038] The rGO-SnO 2 The X-ray diffraction pattern of the nanocomposite is as figure 2 As shown, the rGO-SnO 2 X-ray diffraction peaks in nanocomposites including SnO 2 and diffraction pe...

Embodiment 2

[0050] The present embodiment based on rGO-SnO 2 NO of nanocomposites 2 Gas sensor, its structure diagram is as follows figure 1 As shown, including base 1, platinum lead 2, rGO-SnO 2 Nanocomposite material coating 3, ceramic tube 4, heating wire 5, and gold electrode 6 are composed of six parts. The gold electrode 6 is wound on the surface of the ceramic tube 4 and welded to form a ceramic electrode. The platinum lead wire 2 is welded on the surface of the gold electrode 6 and heated Wire 5 traverses in ceramic tube 4, rGO-SnO 2 The nanocomposite material layer 3 is coated on the entire surface of the ceramic tube 4 and the gold electrode 6, and the heating wire 5 and the platinum lead 2 are sequentially welded on the base 1 to form an rGO-SnO 2 NO of nanocomposites 2 gas sensor.

[0051] A rGO-SnO-based 2 NO of nanocomposites 2 The preparation method of the gas sensor is carried out according to the following steps:

[0052] ① Weigh 60mL of absolute ethanol and 60mL ...

Embodiment 3

[0058] The present embodiment based on rGO-SnO 2 NO of nanocomposites 2 Gas sensor, its structure diagram is as follows figure 1 As shown, including base 1, platinum lead 2, rGO-SnO 2 Nanocomposite material coating 3, ceramic tube 4, heating wire 5, and gold electrode 6 are composed of six parts. The gold electrode 6 is wound on the surface of the ceramic tube 4 and welded to form a ceramic electrode. The platinum lead wire 2 is welded on the surface of the gold electrode 6 and heated Wire 5 traverses in ceramic tube 4, rGO-SnO 2 The nanocomposite material layer 3 is coated on the entire surface of the ceramic tube 4 and the gold electrode 6, and the heating wire 5 and the platinum lead 2 are sequentially welded on the base 1 to form an rGO-SnO 2 NO of nanocomposites 2 gas sensor.

[0059] A rGO-SnO-based 2 NO of nanocomposites 2 The preparation method of the gas sensor is carried out according to the following steps:

[0060] ① Weigh 60 mL of absolute ethanol and 60 m...

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Abstract

The invention discloses an NO2 gas sensitive element based on an rGO-SnO2 nanometer composite material and a preparation method thereof, and belongs to the technical field of graphene-metallic oxide composite material gas sensitive elements. The gas sensitive element mainly consists of an electrode component and the rGO-SnO2 nanometer composite material uniformly coated on the electrode component, the microstructure of the rGO-SnO2 nanometer composite material comprises SnO2 nanospheres uniformly grown on a reduction-oxidation graphene sheet layer, the diameters of the SnO2 nanospheres are 40 to 70 nm, and the material is of a square cassiterite phase structure. The rGO-SnO2 nanometer composite material with large specific surface area, low specific resistance and high dispersibility is prepared by using a one-step hydrothermal method, and then the NO2 gas sensitive element is prepared by taking the rGO-SnO2 nanometer composite material as a gas sensitive coating. The gas sensitive element effectively solves the problems that traditional NO2 gas sensitive elements are relatively high in operating temperature and graphene gas sensitive elements are relatively low in sensitivity and relatively long in recovery time, and has preferable application values and development prospects.

Description

technical field [0001] The invention belongs to the technical field of graphene-metal oxide composite material gas sensor, in particular to a rGO-SnO-based 2 NO of nanocomposites 2 Gas sensor and its preparation method. Background technique [0002] Harmful gases produced or discharged in mining, chemical, electric power and other fields can easily lead to personnel poisoning, fire, explosion and other disasters, seriously endangering the personal safety of employees and the property safety of enterprises; in the fields of environmental protection, medicine, food, military and other fields , gas detection is also an important task. NO 2 It is a strong oxidizing gas, which can produce NO in mine blasting, automobile exhaust, chemical production and fuel combustion. 2 , humans have long been exposed to NO 2 environment will damage the respiratory system, when NO 2 When the concentration is too high, it can also cause human poisoning. In addition, NO 2 It is the main ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 沈岩柏李国栋钟祥熙李昂卢瑞殷尧禹刘文刚魏德洲张云海
Owner NORTHEASTERN UNIV
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