Acetone gas sensor based on alpha-Fe2O3/SnO2 composite nano fibers and preparation method thereof

A technology of composite nanofibers and gas sensors, applied in fiber processing, filament/thread forming, textiles and papermaking, etc., can solve the problems of fast response and recovery speed, high sensitivity of difficult acetone sensors, etc., to achieve increased sensitivity and fast adsorption The effect of desorption and recovery speed acceleration

Inactive Publication Date: 2015-01-07
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, one of the main factors limiting the practical use of this sensor is that it is difficul

Method used

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  • Acetone gas sensor based on alpha-Fe2O3/SnO2 composite nano fibers and preparation method thereof
  • Acetone gas sensor based on alpha-Fe2O3/SnO2 composite nano fibers and preparation method thereof
  • Acetone gas sensor based on alpha-Fe2O3/SnO2 composite nano fibers and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0044] α-Fe composited with Fe:Sn molar ratio of 1:2 2 o 3 / SnO 2 Nanofibers are used as gas-sensitive materials to make FSO-1 type acetone sensors. The manufacturing process is as follows:

[0045] (1) Weigh 0.4g SnCl 4 ·5H 2 O, 1g of polyacrylonitrile (molecular weight 15w), put it into beaker 1, add 10mL of dimethylformamide organic solvent, and stir for 1h in a water bath at 70°C to obtain a uniform mixed solution. Weigh 0.15g FeCl 3 ·6H 2 O, 1g polyvinylpyrrolidone (molecular weight 130w), put it into beaker 2, add 10mL dimethylformamide organic solvent, stir at room temperature for 1h to obtain a uniform mixed solution. The solutions in beaker 1 and beaker 2 were mixed together, and stirred at 70° C. for 3 hours to obtain a precursor solution.

[0046] (2) Transfer the precursor solution obtained in (1) above into a 20mL syringe, and use a metal needle with an inner diameter of 0.7mm at the top of the syringe. Using electrospinning technology, the specific parame...

Embodiment 2

[0053] α-Fe composited with Fe:Sn molar ratio of 1:1 2 o 3 / SnO 2 Nanofibers are used as gas-sensitive materials to make FSO-2 acetone sensors. The manufacturing process is as follows:

[0054] (1) Weigh 0.4g SnCl 4 ·5H 2 O, 1g of polyacrylonitrile (molecular weight 15w), put it into beaker 1, add 10mL of dimethylformamide organic solvent, and stir for 1h in a water bath at 70°C to obtain a uniform mixed solution. Weigh 0.3g FeCl 3 ·6H 2 O, 1g polyvinylpyrrolidone (molecular weight 130w), put it into beaker 2, add 10mL dimethylformamide organic solvent, stir at room temperature for 1h to obtain a uniform mixed solution. The solutions in beaker 1 and beaker 2 were mixed together, and stirred at 70° C. for 3 hours to obtain a precursor solution.

[0055] (2) Transfer the precursor solution obtained in (1) above into a 20mL syringe, and use a metal needle with an inner diameter of 0.7mm at the top of the syringe. Using electrospinning technology, the specific parameters a...

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Abstract

The invention discloses an acetone gas sensor based on alpha-Fe2O3/SnO2 composite nano fibers (a gas sensitive material) and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor is in a side-heating structure, and is composed of a nickel-cadmium alloy heating wire, an alumina ceramic tube, a platinum wire, a gold electrode, and alpha-Fe2O3/SnO2 composite nano fibers (a gas sensitive material). The composite nano fiber can catalyze volatile organic compounds, the oxidation activity of the material can be improved by the organic compounds, and thus the sensor sensitivity is greatly improved. Moreover the acetone gas molecules can be easily transported on the surface of the composite nano fibers, and the acetone gas molecules can be quickly absorbed and desorbed by the composite nano fibers, so the responding speed and recovering speed of the sensor are accelerated. The sensitivity of the acetone sensor made of alpha-Fe2O3/SnO2 composite nano fibers with a mole ratio of Fe:Sn of 1:1 is greatly improved and is 3.6 times more sensitive than that of an acetone sensor made of SnO2 nano fibers, which are not combined with alpha-Fe2O3.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a sensor based on α-Fe 2 o 3 / SnO 2 An acetone gas sensor of a composite nanofiber gas sensitive material and a preparation method thereof. Background technique [0002] With the rapid development of modern social industries, people are exposed to more and more volatile organic compounds in daily life. Among them, acetone is a volatile colorless transparent liquid with special aromatic smell under normal temperature and pressure. As a common organic solvent, acetone is widely used in coatings, pesticides, medicine and other fields. But at the same time, acetone is also a flammable, explosive and toxic organic liquid. Its ignition point is 465°C, and its most flammable volume concentration is 4.5%. Moreover, acetone vapor and air can form explosive mixtures, and the explosion limit is 2.6% to 12.8% %, the concentration that produces the maximum explosion pressure is 6.3%....

Claims

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Application Information

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IPC IPC(8): G01N27/12D01D5/00
Inventor 卢革宇李鑫冯昌浩孙彦峰孙鹏马健郑杰张含
Owner JILIN UNIV
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