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ZnCo2O4/ZnO heterostructure composite gas-sensitive material and preparation method

A technology of gas-sensitive materials and heterogeneous structures, applied in the direction of analysis materials, material resistance, chemical instruments and methods, etc., can solve problems that have not been reported, and achieve broad application prospects and good sensitivity characteristics

Inactive Publication Date: 2018-12-21
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for porous nanosheets made of ZnO and ZnCo 2 o 4 Three-dimensional flower-like ZnO / ZnCo assembled from nanosheets 2 o 4 The p-n heterojunction nanocomposite material and its preparation method have not been reported in the literature so far.

Method used

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  • ZnCo2O4/ZnO heterostructure composite gas-sensitive material and preparation method
  • ZnCo2O4/ZnO heterostructure composite gas-sensitive material and preparation method
  • ZnCo2O4/ZnO heterostructure composite gas-sensitive material and preparation method

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Effect test

Embodiment 1

[0024] Under electromagnetic stirring, 10 mL of NH with a concentration of 0.38 mol / L 4 HCO 3 The aqueous solution was slowly dropped into the solution containing 0.72 gZn(CH 3 COO) 2 2H 2 O and 1.5 gCo(CH 3 COO) 2 4H 2 O in 30 mL aqueous solution, after the dropwise addition, continue electromagnetic stirring for 10 minutes to prepare the precursor solution; transfer the obtained precursor solution to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, which is then sealed and heated at 180 °C Keep it warm for 24 hours, cool to room temperature naturally, collect the product by centrifugation, wash the product four times with deionized water and absolute ethanol, and dry at 60°C for 12 hours to obtain a sacrificial template; the sacrificial template prepared in step 2 The template was used as a self-sacrificing template, and the temperature was raised to 500 °C in air at a heating rate of 2 °C / min, and annealed for 2 hours to obtain ZnCo 2 o 4 / ZnO hetero...

Embodiment 2

[0026] Under electromagnetic stirring, 10 mL of NH with a concentration of 0.38 mol / L 4 HCO 3 The aqueous solution was slowly dropped into the solution containing 0.78 gZn(CH 3 COO) 2 2H 2 O and 1.5 gCo(CH 3 COO) 2 4H 2 O in 30 mL aqueous solution, after the dropwise addition, continue electromagnetic stirring for 20 minutes to prepare the precursor solution; transfer the obtained precursor solution to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, then seal it and store it at 180 °C Keep it warm for 24 hours, cool to room temperature naturally, collect the product by centrifugation, wash the product four times with deionized water and absolute ethanol, and dry at 60°C for 12 hours to obtain a sacrificial template; the sacrificial template prepared in step 2 The template was used as a self-sacrificing template, and the temperature was raised to 500 °C in air at a heating rate of 2 °C / min, and annealed for 2 hours to obtain ZnCo 2 o 4 / ZnO heterostruct...

Embodiment 3

[0032] Under electromagnetic stirring, 10 mL of NH with a concentration of 0.38 mol / L 4 HCO 3 The aqueous solution was slowly dropped into the solution containing 1gZn(CH 3 COO) 2 2H 2 O and 1.5 gCo(CH 3 COO) 2 4H 2 O in 30 mL aqueous solution, after the dropwise addition, continue electromagnetic stirring for 15 minutes to prepare the precursor solution; transfer the obtained precursor solution to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, then seal it and store it at 190 °C Insulated for 20 hours under high temperature, after naturally cooling to room temperature, the product was collected by centrifugation, washed with deionized water and absolute ethanol four times, and dried at 70°C for 18 hours to obtain a sacrificial template; the sacrificial template prepared in step 2 The template was used as a self-sacrificing template, and the temperature was raised to 550 °C in air at a heating rate of 3 °C / min, and annealed for 2 hours to obtain ZnCo 2...

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Abstract

The invention discloses a ZnCo2O4 / ZnO heterostructure composite gas-sensitive material and a preparation method. The ZnCo2O4 / ZnO heterostructure composite gas-sensitive material is formed by compounding flaky zinc oxide and zinc cobaltate, wherein the mass percent of the zinc oxide is 4-13.6%. Through change of the addition amounts of Zn(CH3COO)2.2H2O and Co(CH3COO)2.4H2O, the ZnCo2O4 / ZnO heterostructure composite gas-sensitive materials with different ZnO contents are synthesized, which means that ZnO with different doping ratios can be synthesized by controlling the molar ratio of Zn to Co;the prepared ZnCo2O4 / ZnO heterostructure composite gas-sensitive material has good sensitivity to triethylamine and has a wide application prospect in production of a novel efficient gas sensor.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, in particular to a ZnCo 2 o 4 / ZnO heterostructure composite gas-sensing material and its preparation method. Background technique [0002] Rapid and accurate detection of toxic and harmful gases in the environment is of great significance to environmental protection. Gas sensors based on metal-oxide-semiconductor gas-sensing materials have become an important means of gas detection due to their high sensitivity, fast response, simple manufacturing method, small size, and low price. Metal-oxide-semiconductor gas-sensing materials are the core components of this type of gas sensor, and their gas-sensitivity properties directly affect the performance and application of gas sensors. Therefore, the design and preparation of new metal oxide semiconductor materials with high-efficiency gas sensing performance is of great significance to improve the performance of gas sensors, and has become on...

Claims

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Application Information

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IPC IPC(8): C01G9/02C01G51/00G01N27/12
CPCC01G9/02C01G51/00C01P2002/72C01P2004/01C01P2004/03C01P2004/61C01P2006/12G01N27/125
Inventor 孙广罗娜李彦伟曹建亮张战营
Owner HENAN POLYTECHNIC UNIV
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