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Preparation method and application of ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material

A zno-sno2-zn2sno4 and nanofiber technology is applied in the field of gas sensors, which can solve the problems of unfavorable large-scale application and high working temperature, and achieve the effects of uniform and controllable morphology, reduction of recombination rate and simple preparation method.

Active Publication Date: 2020-03-06
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

Although based on Zn 2 SnO 4 The composite material can enhance its gas sensitivity response value, but its working temperature is still relatively high, which is not conducive to commercial large-scale application
[0004] In order to solve this problem, the present invention adopts electrospinning method combined with high heating rate of heat treatment to prepare ZnO-SnO 2 -Zn 2 SnO 4 Porous nanofiber gas sensing material, this ZnO-SnO 2 -Zn 2 SnO 4 Porous nanofibrous gas-sensing materials have not yet been reported, and they have obvious response and high selectivity to alcohol at room temperature

Method used

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  • Preparation method and application of ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material
  • Preparation method and application of ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material

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Experimental program
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Effect test

Embodiment 1

[0033] Add 0.768g zinc acetate dihydrate and 0.8392g tin acetate to 5.5mL, 2mol / L N,N dimethylformamide; then add 0.700g polyvinylpyrrolidone to the above mixed solution to make the solution have a certain viscosity degree, the above solution was stirred at room temperature for 11.5 h to obtain a precursor solution for electrospinning. The process parameters in the spinning process are: high voltage 17kV, negative high voltage -1kV, precursor liquid flow rate 1.0mL / h, distance between spinning head and receiver 13cm. The precursor nanofibers obtained by spinning were calcined in air, the calcination heating rate was set to 8°C / min, the calcination temperature was raised to 680°C and kept for 1 hour, and finally ZnO-SnO 2 -Zn 2 SnO 4 Porous nanofiber gas-sensing material with a fiber diameter of 180nm.

Embodiment 2

[0035] Add 0.878g zinc acetate dihydrate and 0.7438g tin acetate to 4.8mL, 2mol / L N,N dimethylformamide; then add 0.7g polyvinylpyrrolidone to the above mixed solution to make the solution have a certain viscosity degree, the above solution was stirred at room temperature for 12 h to obtain a precursor solution for electrospinning. The process parameters in the spinning process are: high voltage 15.3kV, negative high voltage 2kV, precursor liquid flow rate 1.2mL / h, and the distance between the spinning head and the receiver is 15cm. The precursor nanofibers obtained by spinning were calcined in the air, the calcination heating rate was set to 10°C / min, the calcination temperature was raised to 650°C and kept for 3 hours, and finally ZnO-SnO 2 -Zn 2 SnO 4 Porous nanofiber gas sensing materials.

[0036] In the present embodiment, for the scanning electron microscope (SEM) photo, TEM picture and HRTEM scanning test of the prepared crystal product, see respectively figure 1 ,...

Embodiment 3

[0042] Add 0.9801g of zinc acetate dihydrate and 0.7951g of tin acetate to 6.7mL, 2mol / L N,N dimethylformamide; then add 0.7g of polyvinylpyrrolidone to the above mixed solution to make the solution have a certain viscosity degree, the above solution was stirred at room temperature for 12.5 h to obtain a precursor solution for electrospinning. The technological parameters in the spinning process are: high voltage 16kV, negative high voltage 1kV, precursor liquid flow rate 1.5mL / h, and the distance between the spinning head and the receiver is 16cm. The precursor nanofibers obtained by spinning were calcined in air, the calcination heating rate was set to 13°C / min, the calcination temperature was raised to 670°C and kept for 2 hours, and finally ZnO-SnO 2 -Zn 2 SnO 4 Porous nanofiber gas sensing material with a fiber diameter of 220nm.

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Abstract

The invention belongs to the technical field of gas sensors, and in particular relates to a ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material and a preparation method and application thereof. According to the invention, the ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material is prepared by adopting an electrostatic spinning method in combination with a high heat treatment heating rate.The preparation method is simple, few in process, easy to operate and relatively good in room-temperature gas sensitivity. The invention further provides the application of the ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material in the aspect of detecting or sensing an alcohol gas at room temperature. The ZnO-SnO2-Zn2SnO4 porous nanofiber gas sensitive material is prepared into a ZnO-SnO2-Zn2SnO4 gas sensor, and the sensor has obvious response and high selectivity to alcohol at room temperature.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a ZnO-SnO 2 -Zn 2 SnO 4 Preparation method and application of porous nanofiber gas-sensing material. Background technique [0002] Alcohol sensors are widely used in drunk driving detection, disease diagnosis, food industry and environmental monitoring. Zn 2 SnO 4 It has properties such as high electrical conductivity, high electron mobility, potential optical properties and thermal stability, and is a good gas-sensitive material. Currently, there have been studies on Zn 2 SnO 4 Reports on the application of nanomaterials in alcohol detection. For example, W.C.Wang et al. Ethanol gas sensing performance of Zn 2 SnO 4 nanopowder prepared via ahydrothermal route with different solution pH values ​​reported Zn prepared by hydrothermal method 2 SnO 4 Nanopowder has response value to 200ppm alcohol at 300℃; Y.Q.Jiang et al. Hydrothermal syntheses and gas sensing proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12B82Y15/00B82Y30/00B82Y40/00
CPCG01N27/127B82Y15/00B82Y30/00B82Y40/00Y02A50/20
Inventor 孙辉卢红兵辛霞张元一
Owner SHAANXI NORMAL UNIV
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