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Acetone gas sensor of LaFeO3 nano sensitive material based on nuclear shell microsphere structure and its preparation method

A technology for gas sensors and sensitive materials, applied in nanotechnology, chemical instruments and methods, and nanotechnology for materials and surface science, can solve the problems of unsatisfactory detection gas sensitivity results, achieve small size, simple operation, The effect of broad application prospects

Inactive Publication Date: 2018-02-02
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a gas-sensing material, although many synthetic preparation methods have been proposed and realized, because the obtained material morphology is mainly some low-dimensional structures, the sensitivity of the gas detection results obtained is not ideal.

Method used

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  • Acetone gas sensor of LaFeO3 nano sensitive material based on nuclear shell microsphere structure and its preparation method
  • Acetone gas sensor of LaFeO3 nano sensitive material based on nuclear shell microsphere structure and its preparation method
  • Acetone gas sensor of LaFeO3 nano sensitive material based on nuclear shell microsphere structure and its preparation method

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Embodiment 1

[0038] LaFeO with core-shell microsphere structure prepared by a long-term hydrothermal reaction 3 The acetone gas sensor is a sensitive material, and its specific manufacturing process is as follows:

[0039] 1) First, 0.32g of La(NO 3 ) 3 ·6H 2 O and 0.3g Fe(NO 3 ) 3 9H 2 Dissolve O in 40mL of a mixed solution of water and ethylene glycol (volume ratio 19:1), stir for 30min, then add 0.16g of citric acid and 0.6g of PVP, and continue stirring for 30min.

[0040] 2) Put the solution obtained in step 1 into a 50mL polytetrafluoroethylene kettle liner, seal it, put it into a stainless steel reaction kettle and tighten the lid, transfer it to an oven and react at 140°C for 12h. After the reaction was completed and cooled to room temperature naturally, the sediment on the bottom of the kettle was retained, washed repeatedly by centrifugation with ethanol and deionized water for 6 times, and then dried in air at 80°C for 12 hours.

[0041] 3) Put the powder obtained in step...

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Abstract

The invention discloses an acetone gas sensor of a LaFeO3 nano sensitive material based on a nuclear shell microsphere structure and its preparation method, and belongs to the technical field of an oxide semiconductor gas sensor. The sensor is a tubular structure and composed of an Al2O3 ceramic tube, a Pt wire, a Ni-Cr alloy heating coil and a LaFeO3 nano sensitive material; the outer surface ofthe Al2O3 ceramic tube is coated with two separated annular Au electrodes in parallel, the Pt wire is welded to the annular Au electrodes; the Ni-Cr alloy heating coil crosses through the Al2O3 ceramic tube core, and the LaFeO3 nano sensitive material of the nuclear shell microsphere structure is coated on the Al2O3 ceramic tube and the annular Au electrode. The sensor is featured by high integrity degree, simple structure, low price, small volume, durability and large batch production; the testing result of the air-sensitive property indicates that the sensor has quick response and recovery speed to acetone gas and extremely good long-term stability; thus the sensor has important application prospect in detection of acetone gas in the indoor environment.

Description

technical field [0001] The invention belongs to the technical field of oxide semiconductor gas sensors, in particular to a LaFeO based on a core-shell microsphere structure 3 Acetone gas sensor of nano sensitive material and preparation method thereof. Background technique [0002] With the development of modern technology, the arbitrary discharge of automobile exhaust and various toxic and harmful gases and flammable gases produced by industrial waste gas have destroyed the living environment of human beings. Explosions caused by leakage of benzene, formaldehyde, VOC gases, etc. produced by home decoration, such as gas, threaten human health and the safety of life and property. Therefore, the detection of toxic and harmful gases is particularly important. The research on gas-sensing materials for detecting these gases has also been paid more and more attention. [0003] Among the many types of gas sensing elements, resistive semiconductor oxide gas sensing elements occup...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G49/00B82Y30/00
CPCG01N27/127B82Y30/00C01G49/00C01P2002/72C01P2004/03C01P2004/34C01P2004/61
Inventor 孙鹏王博群卢革宇刘方猛梁喜双
Owner JILIN UNIV
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