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Trimethylamine gas sensor and preparation method thereof

A gas sensor, trimethylamine technology, applied in the field of trimethylamine gas sensor and its preparation, can solve the problems of poor sensitivity, long response time, low resolution, etc., achieve low working temperature, short response and recovery time, anti- disruptive effects

Inactive Publication Date: 2013-04-24
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing trimethylamine gas sensor still has disadvantages such as poor sensitivity, low resolution, and long response time, so the SnO 2 It is a very important research topic in this field to improve the gas-sensing material to improve its gas-sensing characteristics

Method used

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  • Trimethylamine gas sensor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of trimethylamine gas sensitive sensor, comprises gas sensitive electrode tube, and described gas sensitive electrode tube is made of Al 2 o 3 The ceramic tube is used as the carrier, with nano-SnO 2 It is a gas-sensitive material, and the gas-sensitive material contains SnO 2 2.5% Eu by molar mass 3+ .

[0025] The preparation steps are as follows:

[0026] 1) Nano SnO 2 Preparation: Weigh 3.5060g of SnCl 4 ·5H 2 O and 6.8458 g of sucrose were dissolved in double distilled water to prepare 70 mL of a mixed clear solution. Transfer the solution into a polytetrafluoroethylene-lined reaction kettle, cover it tightly, and raise the temperature to 180°C, react at a constant temperature for 12 hours, take it out, and let it cool naturally. Open the reaction kettle, take out the inner liner, pour out the resulting black reactant, and wash it several times with absolute ethanol and distilled water (using AgNO 3 There is no residual Cl- in the solution detection...

Embodiment 2

[0031] A kind of trimethylamine gas sensitive sensor, comprises gas sensitive electrode tube, and described gas sensitive electrode tube is made of Al 2 o 3 The ceramic tube is used as the carrier, with nano-SnO 2 It is a gas-sensitive material, and the gas-sensitive material contains SnO 2 2% La by molar mass 3+ .

[0032] The preparation steps are as follows:

[0033] 1) Preparation of gas-sensitive material: weigh 17.53g of SnCl 4 ·5H 2 O and 34.23 g of sucrose, SnCl 4 ·5H 2 The molar ratio of O to sucrose is 1?2, and 0.433g of La(NO 3 ) 3 make the final La 2 o 3 and SnO 2 The molar ratio of 2% was dissolved in 400 mL of twice distilled water under stirring conditions. Put the solution into a reaction kettle with a polytetrafluoroethylene liner, cover it tightly and raise the temperature to 150°C, react at a constant temperature for 24 hours, take it out, and let it cool naturally. Open the reaction kettle, take out the lining, pour out the resulting black rea...

Embodiment 3

[0037] A kind of trimethylamine gas sensitive sensor, comprises gas sensitive electrode tube, and described gas sensitive electrode tube is made of Al2 o 3 The ceramic tube is used as the carrier, with nano-SnO 2 It is a gas-sensitive material, and the gas-sensitive material contains SnO 2 3% Eu by molar mass 3+ .

[0038] The preparation steps are as follows:

[0039] 1) Nano SnO 2 Preparation: Weigh 35.060g of SnCl 4 ·5H 2 O and 68.458 g of sucrose were dissolved in double distilled water to prepare 1000 mL of a mixed clear solution. Put the solution into a reaction kettle with a polytetrafluoroethylene liner, cover it tightly and raise the temperature to 200°C, react at a constant temperature for 4 hours, take it out, and let it cool naturally. Open the reaction kettle, take out the lining, pour out the resulting black reactant, wash three times with distilled water and absolute ethanol respectively, dry the black product, heat it to 550°C in a muffle furnace, and si...

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Abstract

The invention discloses a trimethylamine gas sensor which comprises a gas sensing electrode tube, wherein an AI2O3 ceramic tube is as a carrier of the gas sensing electrode tube, nanometer SnO2 is as gas sensitive materials, and Eu3+ or La3+ which accounts for 0.5-5% of SnO2 molar mass is contained in the gas sensitive materials. The invention also discloses a preparation method of the trimethylamine gas sensor. The preparation method of the trimethylamine gas sensor includes steps of preparation of coralloid nanometer SnO2, preparation of the gas sensitive materials, preparation of the gas sensing electrode tube and the like. The gas sensitive material prepared in the trimethylamine gas sensor has the characteristics of nanometer materials of quantum effect, autocatalysis activity, surface effect and the like. The trimethylamine gas sensor which is made of the gas sensitive materials has the advantages of being high in sensitivity, good in anti-interference, short in response and recovery time, low in working temperature and the like when trimethylamine gas is detected. The trimethylamine gas sensor can be used for detecting trimethylamine gas pollution.

Description

technical field [0001] The invention belongs to the technical field of trace gas detection, and relates to a trimethylamine gas sensor and a preparation method thereof. Background technique [0002] Trimethylamine is one of the main objects of national odor pollution control. It is the main gas produced during the decomposition of protein in fish. The content of trimethylamine has become an important indicator of the freshness of aquatic products today. [0003] The evaluation of the freshness of aquatic products is in the stage of exploratory research in China and has not yet been industrialized. Domestic detection methods for trimethylamine gas include gas chromatography, ion chromatography, and high performance liquid chromatography. These methods are complex, time consuming and require expensive equipment. In addition, the release of trimethylamine gas from the deterioration of aquatic products is a slow process, so the research on a simple, sensitive, fast, intuitive,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 瞿阳王慧陈浩薛爱芳
Owner HUAZHONG AGRI UNIV
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