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A lafeo co-modified with au and cl 3 Ethanol gas sensor and preparation method thereof

A gas sensor, ethanol-based technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of gas response and selectivity to be improved, unfavorable low-power device research, insufficient gas response, etc., and achieve high selectivity and selectivity. Stability, easy operation, low cost effect

Active Publication Date: 2020-04-28
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, based on the previous research work of scientific researchers, we found that: LaFeO 3 The resistance itself is very large, which is not conducive to practical applications, and LaFeO 3 The optimal operating temperature of ethanol-based gas sensor components is still high, usually above 200 ° C, which is not conducive to the research of low-power devices; the gas response to ethanol gas is not high enough at the optimal operating temperature, especially for low concentrations The ethanol gas response needs to be improved
The current method is mainly to replace the position of trivalent La by doping divalent elements such as Ca, Sr, Ba, Pb, or replace the position of trivalent Fe by doping with elements such as Co, Mg, Ni, etc., to provide more holes. Carriers, thereby reducing the resistance of the material and improving its gas-sensing performance, but currently LaFeO 3 Gas response and selectivity of ethanol-based gas sensor elements still need to be improved

Method used

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  • A lafeo co-modified with au and cl <sub>3</sub> Ethanol gas sensor and preparation method thereof
  • A lafeo co-modified with au and cl <sub>3</sub> Ethanol gas sensor and preparation method thereof
  • A lafeo co-modified with au and cl <sub>3</sub> Ethanol gas sensor and preparation method thereof

Examples

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Embodiment 1

[0018] Example 1: A kind of Au and Cl co-modified LaFeO 3 ethanol based gas sensor, in LaFeO 3 The solution was added with LaFeO 3 1% HAuCl with a mass ratio of 1:100 4 Aqueous solution, preparation of Au and Cl co-modified LaFeO by sol-gel method 3 The nanopowder is then prepared into a side-heated ceramic tube structure gas sensor element.

[0019] The specific preparation method is:

[0020] (1) LaFeO 3 Preparation of nanopowder: accurately weigh 0.02mol La(NO 3 ) 3 · 6H 2 O and Fe(NO 3 ) 3 9H 2 O, dissolved in deionized water; add 0.08mol citric acid and 2g polyethylene glycol PEG-6000, add 4.85ml HAuCl with a mass fraction of 1% 4 Put the aqueous solution in a 70-80°C water bath and stir to form a sol, and continue to stir until it is in the state of dry gel; put the dry gel in a crucible and heat it at 380-420°C until the dry gel burns completely and turns into a powder state, no longer Before burning, organic matter is removed, the obtained powder is fully g...

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Abstract

The invention belongs to the technical field of gas sensor production, and provides an Au and Cl co-modified LaFeO3-based ethanol gas sensor and a production method thereof. The method comprises the following steps: adding an aqueous HAuCl4 solution with the mass fraction being 1% into a LaFeO3 solution according to a mass ratio of the aqueous HAuCl4 solution to the LaFeO3 solution of 1:100, preparing Au and Cl co-modified LaFeO3 nano-powder through a sol-gel technology, and producing an indirectly-heated ceramic tube structure gas sensor element. The best working temperature of the produced gas sensor element to ethanol is 128 DEG C; the gas response to 100 ppm of ethanol at the best working temperature is 47.7, and has no much change 96 h later, so the gas sensor element has a good stability; the response to 100 ppm of DMF, dichloromethane, n-hexane, carbon dioxide, and hydrogen gases is 23.3 or less, and has a good selectivity; the gas response to 20 ppm of ethanol is 19.5, and thegas sensor element has a very high gas response to a low-concentration ethanol gas.

Description

technical field [0001] The invention belongs to the technical field of gas sensor preparation, in particular to a LaFeO co-modified with Au and Cl 3 Ethanol-based gas sensor and its preparation method, LaFeO co-modified with Au and Cl 3 Nano-powder is the working substance, which can significantly improve the LaFeO 3 The gas response of the ethanol-based gas sensor element, where the gas response is defined as the ratio of the resistance of the sensor element in the gas environment to be measured to the resistance in dry air. Background technique [0002] With the development of modern society, people pay more and more attention to health and safety issues. Ethanol is the main component of all kinds of alcohol, and it is also a flammable gas. Excessive drinking, drunk driving and leakage of ethanol have great health and safety Therefore, a highly sensitive, highly selective, stable and reliable ethanol gas sensor is of great significance to human health and life safety. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 曹恩思陈彬初志文武爱婷张雍家孙礼郝文涛
Owner TAIYUAN UNIV OF TECH
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