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Material for detecting indoor organic gas and method for preparing gas-sensitive element using same

A technology of organic gas and gas sensor, which is applied in the direction of analyzing materials, optomechanical equipment, and electrochemical variables of materials, etc. It can solve the problems of affecting the output of gas sensitive signals and the poor continuity of the interdigital electrode electric field, etc., to reduce the detection Extreme concentration, beneficial to miniaturization, small electrode area

Inactive Publication Date: 2010-02-03
CHONGQING UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0004] Chinese patent CN1431491 discloses a low-power chemical gas sensor chip, sensor and its preparation method. The invention uses microelectronics manufacturing technology to make a chemical sensor chip on a glass chip. The main feature is that the shape of the sensitive electrode of the chip It is an interdigitated electrode, which can amplify the microcurrent sensitive signal and improve the sensitivity by using this shape electrode, but the electric field continuity of the interdigitated electrode is not good, which affects the sensitive signal output when detecting gas

Method used

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  • Material for detecting indoor organic gas and method for preparing gas-sensitive element using same
  • Material for detecting indoor organic gas and method for preparing gas-sensitive element using same

Examples

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Embodiment 1

[0036] 1. SnCl 4 ·5H 2 O is configured as a 0.1mol / L solution, and 0.1LSnCl is taken at a molar ratio of 1:4 4 The solution was mixed with 8.4 g of citric acid until the acid was completely dissolved to obtain a transparent sol. Add 7.6ml of ammonia water dropwise until the pH of the sol is 8, and heat up to 80°C to form a white emulsion. After suction filtration, the precipitate is washed and there is no residual Cl - After (with AgNO 3 solution detection), dried in a vacuum oven at a low temperature of 80°C to obtain a xerogel, which was ground by agate to obtain 1.5g of powdered solid SnO 2 Base material, add 0.05g solid silver nitrate and 0.06g solid cadmium nitrate to SnO 2 , mixed evenly, dried in a muffle furnace at 80-100°C, and then sintered at 450°C for 1-2h to obtain 1.6g of sensitive material.

[0037] 2. The following steps of the method for preparing the gas sensor for detecting indoor organic gases (see figure 1 ):

[0038] (1) Take an alumina ceramic sub...

Embodiment 2

[0045] Prepare SnO according to the method of embodiment 1 2 Base material, take 1.5gSnO 2 Base material, add 0.06g silver nitrate and 0.09g cadmium nitrate to SnO 2 , mixed evenly, dried in a muffle furnace at 80°C, and then sintered at 450°C for 2 hours to obtain 1.6g of sensitive material. According to the method of Example 1, the gas sensor for detecting the organic gas in the chamber is prepared, and the performance and effect of the obtained gas sensor are the same as those of the gas sensor of the present invention.

Embodiment 3

[0047] Prepare SnO according to the method of embodiment 1 2 Base material, take 1.5gSnO 2 Base material, add 0.08g silver nitrate and 0.13g cadmium nitrate to SnO 2 , mixed evenly, dried in a muffle furnace at 80°C, and then sintered at 450°C for 2 hours to obtain 1.6g of sensitive material. According to the method of Example 1, the gas sensor for detecting the organic gas in the chamber is prepared, and the performance and effect of the obtained gas sensor are the same as those of the gas sensor of the present invention.

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Abstract

The invention relates to a material for detecting indoor organic gas and a method for preparing a gas-sensitive element using the same. The material comprises the following components by weight percent: 3-8 percent of silver nitrate, 4-11 percent of cadmium nitrate and the balance of SnO2 base material. The gas-sensitive element which is prepared by the sensitive material and is used for detecting indoor organic gas can detect residual micro organic gas after indoor decoration, has a better sensitive signal, can greatly reduce the detection limiting concentration of the organic gas, has small volume and is beneficial to micromation.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor gas sensor elements, and in particular relates to a sensitive material for detecting indoor organic gas and a method for preparing a gas sensor element with the material. Background technique [0002] With the improvement of people's living standards, interior decoration has become more and more common, but the subsequent indoor organic gas pollution (aldehydes, benzene gases) has to arouse people's attention. For example, plywood, fiberboard, and other wood-based panels in room decoration materials and furniture contain a large amount of aldehyde-based organic volatile substances, and various paints and coatings contain benzene additives. The problem of organic pollution is a serious threat to human health and has aroused people's great concern. The content of organic gas has become an important safety indicator for monitoring indoor pollution. [0003] Because the tiny organic...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/407G03F7/00
Inventor 刘天模曾文王金星雷晓飞袁晗琦秦文勇刘建忠
Owner CHONGQING UNIV
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