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SnO2 gas sensitive material with high response sensitivity as well as preparation process and application of SnO2 gas-sensitive material

A technology of response sensitivity and gas-sensing materials, applied in high-response-sensitivity SnO2 gas-sensing materials and preparation process and application fields, can solve the problem of high power consumption, limited market application ability, and high working temperature (more than 200 to more than 300). Celsius, etc.

Inactive Publication Date: 2021-02-26
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, traditional tin dioxide (SnO 2 ) The preparation cost of semiconductor nanomaterials is low, and SnO 2 The sensor has good response sensitivity characteristics to a variety of VOCs, but the outstanding defects are high operating temperature (more than 200 to more than 300 degrees Celsius), high power consumption, especially strong cross-selectivity for various VOCs, the above bottlenecks problem severely limits the SnO 2 The market application capability of sensors for VOCs detection

Method used

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  • SnO2 gas sensitive material with high response sensitivity as well as preparation process and application of SnO2 gas-sensitive material
  • SnO2 gas sensitive material with high response sensitivity as well as preparation process and application of SnO2 gas-sensitive material
  • SnO2 gas sensitive material with high response sensitivity as well as preparation process and application of SnO2 gas-sensitive material

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Embodiment 1

[0027] A kind of high response sensitivity SnO 2 Gas-sensitive material and preparation process, comprising the following steps:

[0028] S1: Preparation of carbon sphere template: At 35°C, put 3.2g of glucose and 35ml of deionized water into the reactor to fully dissolve, add a 5% NaOH solution to the reactor and adjust the pH to 10 to obtain a mixed solution, the mixed solution was transferred to a 50ml polytetrafluoroethylene-lined autoclave, and reacted at 180°C for 10 hours, then washed, collected, and dried in an oven at 80°C for 12 hours to obtain a carbon sphere template;

[0029] S2: Preparation of precursor liquid for high-voltage electrospinning: take 0.32g PVP and dissolve it in 2ml ethanol to obtain solution A, take 0.73g SnCl 2 2H 2 O and 0.036g Pr(NO 3 ) 3 ·6H 2 O was completely dissolved in 2.6ml of DMF to obtain solution B. Put solution A and solution B into a magnetic stirrer and stir for 3h, keeping the temperature in the magnetic stirrer at 30°C, and t...

Embodiment 2

[0034] Nanoscale pure SnO was prepared under the same conditions as in Example 1 2 Sample (containing carbon sphere template), and obtain SnO by the method in embodiment 1 2 Base sensor (with carbon sphere template).

Embodiment 3

[0036] Nanoscale pure SnO was prepared under the same conditions as in Example 1 2 Sample (no carbon sphere template), and obtain SnO by the method in embodiment 1 2 base sensor (no carbon sphere template).

[0037] In the present invention figure 1 Available: High Response Sensitivity SnO 2 The main component of the gas-sensing material is Pr-doped SnO 2 .

[0038] In the present invention figure 2 Available: High Response Sensitivity SnO 2 The gas sensitive material is a beaded hollow fiber structure with a rough surface.

[0039] In the present invention image 3 Available: High Response Sensitivity SnO 2 The fiber element composition and microstructure details of gas-sensitive materials have been fully confirmed.

[0040] this invention Figure 5 middle:

[0041] (a) High response sensitivity SnO 2 based sensor, SnO 2 based sensor (with carbon sphere template) and SnO 2 The response of the base sensor (no carbon sphere template) to 100ppm ethanol at different ...

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Abstract

The invention discloses a SnO2 gas-sensitive material with high response sensitivity as well as a preparation process and application of the SnO2 gas-sensitive material. The preparation process comprises the following steps of: S1, preparing a carbon sphere template; S2, preparing a precursor solution for high-voltage electrostatic spinning; and S3, preparing the SnO2 gas-sensitive material with high response sensitivity. The SnO2 gas-sensitive material with high response sensitivity synthesized by the method shows excellent response characteristics to low-concentration ethanol through sensorpreparation and static gas-sensitive test: (1) the detection concentration is as low as 5ppm; (2) the working temperature is 200 DEG C; (3) the response value to 100ppm ethanol is as high as 35.6, theresponse time and the recovery time are respectively 12s and 8s. The cross response problem of the SnO2 gas-sensitive material and VOCs such as methanol (CH3OH), formaldehyde (HCHO), acetone (CH3COCH3), acetic acid (CH3COOH), ammonia (NH3) and the like is solved.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a high-response-sensitivity SnO 2 Gas-sensitive materials and their preparation techniques and applications. Background technique [0002] The research on nano-semiconductor sensors has attracted the attention of researchers at home and abroad in recent years. Innovative research on various gas sensors is concentrated in industrial emission control, home safety (indoor air quality monitoring), environmental monitoring, health care (disease diagnosis and trace analysis of human exhaled gas components), etc. There are many existing research reports on gas-sensitive materials for ethanol (CH 3 CH 2 OH), acetone (CH 3 COCH 3 ) and other volatile organic compounds (VOCs) detection. VOCs widely exist in various aspects such as dyes, drugs, and building decoration materials. They are irritating and toxic to the human body. They can cause immune disorders and affect the funct...

Claims

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Application Information

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IPC IPC(8): C01G19/02B82Y40/00D01F9/08G01N27/12
CPCC01G19/02B82Y40/00D01F9/08G01N27/127C01P2004/16
Inventor 徐小丽柳旺旺陈彦王笙伊张国恒王涛马书懿
Owner NORTHWEST NORMAL UNIVERSITY