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Zinc tungstate/zinc oxide heterogeneous nanofiber as well as preparation method and application thereof

A nanofiber, zinc tungstate technology, applied in the field of nanomaterials, can solve the problems of poor selectivity, slow response, poor stability, etc., and achieve the effect of improving gas sensing performance, promoting adsorption and analysis, and high sensitivity response.

Active Publication Date: 2021-10-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, starting from the above research results, the microstructure of ZnO nanomaterials is adjusted to develop a gas-sensitive material with improved sensitivity to triethylamine , it is expected to overcome the problems of poor selectivity, poor stability and slow response in the detection of triethylamine in existing gas sensors

Method used

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  • Zinc tungstate/zinc oxide heterogeneous nanofiber as well as preparation method and application thereof
  • Zinc tungstate/zinc oxide heterogeneous nanofiber as well as preparation method and application thereof
  • Zinc tungstate/zinc oxide heterogeneous nanofiber as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of zinc tungstate / zinc oxide heterogeneous nanofiber, its preparation method comprises the steps:

[0032] (1) Add 0.5949g (2mmol) of zinc nitrate hexahydrate, 1.5g of polyvinylpyrrolidone and 0.1152g (0.04mmol) of phosphotungstic acid to 9mL of N,N-dimethylformamide, After stirring and mixing at a rate of 500rpm for 12h, a transparent and uniform precursor solution was obtained;

[0033] (2) Put the above precursor solution into a 5mL plastic syringe with a blunt stainless steel needle (the needle specification is 20G) for electrospinning, fix the distance between the needle and the aluminum foil collector substrate to 15cm, and apply 15kV Spinning voltage to obtain precursor nanofibers;

[0034] (3) Calcining the above-mentioned precursor fibers in the air, raising the temperature from room temperature to 600°C at a heating rate of 2°C / min, and calcination for 4 hours at a heat preservation temperature, to obtain the zinc tungstate / zinc oxide heterogeneous nan...

Embodiment 2

[0040] A kind of zinc tungstate / zinc oxide heterogeneous nanofiber, its preparation method comprises the steps:

[0041] (1) Add 0.5949g (2mmol) of zinc nitrate hexahydrate, 1.5g of polyvinylpyrrolidone and 0.0288g (0.01mmol) of phosphotungstic acid to 9mL of N,N-dimethylformamide, After stirring and mixing at a rate of 500rpm for 12h, a transparent and uniform precursor solution was obtained;

[0042] (2) Put the above precursor solution into a 5mL plastic syringe with a blunt stainless steel needle (the needle specification is 20G) for electrospinning, fix the distance between the needle and the aluminum foil collector substrate to 15cm, and apply 15kV Spinning voltage to obtain precursor nanofibers;

[0043] (3) Calcining the above-mentioned precursor fibers in the air, raising the temperature from room temperature to 600°C at a heating rate of 2°C / min, and sintering for 4 hours at a heat preservation temperature to obtain the zinc tungstate / zinc oxide heterogeneous nanofi...

Embodiment 3

[0045] A kind of zinc tungstate / zinc oxide heterogeneous nanofiber, its preparation method comprises the steps:

[0046] (1) Add 0.5949g (2mmol) of zinc nitrate hexahydrate, 1.5g of polyvinylpyrrolidone and 0.0576g (0.02mmol) of phosphotungstic acid to 9mL of N,N-dimethylformamide, After stirring and mixing at a rate of 500rpm for 12h, a transparent and uniform precursor solution was obtained;

[0047] (2) Put the above precursor solution into a 5mL plastic syringe with a blunt stainless steel needle (the needle specification is 20G) for electrospinning, fix the distance between the needle and the aluminum foil collector substrate to 15cm, and apply 15kV Spinning voltage to obtain precursor nanofibers;

[0048] (3) Calcining the above-mentioned precursor fibers in the air, raising the temperature from room temperature to 600°C at a rate of 2°C / min, and calcination at a heat preservation rate of 4h to obtain the zinc tungstate / zinc oxide heterogeneous nanofibers. %PW 12 expr...

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Abstract

The invention discloses zinc tungstate / zinc oxide heterogeneous nanofiber as well as a preparation method and application thereof. The preparation method comprises the steps that the molar weight of zinc nitrate is fixed in an electrostatic spinning precursor solution, the molar weight of phosphotungstic acid is regulated and controlled, the precursor solution is mixed and stirred to be uniform, then electrostatic spinning is conducted, and calcination is conducted in air, so that the zinc tungstate / zinc oxide heterogeneous nanofiber synthesized with the assistance of polyoxometallate is obtained. The one-dimensional heterogeneous nanofiber is composed of zinc tungstate and zinc oxide compounded with the zinc tungstate, and has an n-n type heterogeneous nanofiber structure. When the heterogeneous nanofiber is used as a gas sensitive sensor, a gas sensitive test result shows that the gas sensitive sensor has the characteristic of high-sensitivity quick response to triethylamine. In combination with excellent electron transfer performance and large specific surface area of the zinc tungstate / zinc oxide heterogeneous nanofiber, the gas sensitive sensor can realize high-selectivity, high-sensitivity and long-term stable detection of the triethylamine.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a zinc tungstate / zinc oxide heterogeneous nanofiber and a preparation method and application thereof. Background technique [0002] Triethylamine (TEA) is a typical threatening air pollutant, which is harmful to human health and the environment. TEA is often used as a catalyst, curing agent, solvent, preservative, and used in pharmaceutical production. These products inevitably have a certain amount of TEA residue and have a strong ammonia odor. In reality, TEA leakage can irritate the skin and respiratory tract, seriously threatening human health. Currently, the American Conference of Governmental Industrial Hygienists (ACGIH) recommends a concentration threshold of 1 ppm for triethylamine. In order to ensure production safety and people's health, the detection of triethylamine will be a work of great significance. [0003] A gas sensor refers to a type of device that r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08G01N27/00
CPCD01F9/08G01N27/00
Inventor 陈黎蔡刘欣郭正
Owner ANHUI UNIVERSITY
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