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A rgo-sno based 2 The no of nanocomposites 2 Gas sensor and its preparation method

A nanocomposite material and gas sensor technology, which is applied in the field of graphene-metal oxide composite gas sensor, can solve the problems of high working temperature, poor selectivity, and low sensitivity, and achieve low resistivity, good selectivity and Excellent stability and dispersibility

Active Publication Date: 2020-07-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • 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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  • A rgo-sno based <sub>2</sub> The no of nanocomposites <sub>2</sub> Gas sensor and its preparation method
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  • A rgo-sno based <sub>2</sub> The no of nanocomposites <sub>2</sub> Gas sensor and its preparation method

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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 a rGO-SnO-based 2 NO of nanocomposites 2 A gas sensor and a preparation method thereof belong to the technical field of graphene-metal oxide composite gas sensors. The gas sensor is mainly composed of electrode elements and rGO-SnO evenly coated on the electrode elements. 2 Nanocomposite composition, the rGO‑SnO 2 The microscopic morphology of the nanocomposite is SnO uniformly grown on reduced graphene oxide sheets. 2 Nanospheres, the SnO 2 The diameter of the nanosphere is 40-70nm, and it has a tetragonal cassiterite phase structure. This invention uses a one-step hydrothermal method to prepare rGO-SnO with large specific surface area, low resistivity and good dispersion. 2 nanocomposite, and then rGO‑SnO 2 Nanocomposites are used as gas-sensitive coatings to prepare NO 2 Gas sensor. This gas sensor effectively solves the problem of traditional NO 2 Gas sensors have problems such as high operating temperature and low sensitivity and long recovery time of graphene-based gas sensors, which have good application value 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 Patents(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 LIAONING