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Preparation method of crystal-non-crystal metal oxide composite gas-sensitive material

A gas-sensitive material and oxide technology, which is applied in the analysis of materials, material analysis by electromagnetic means, and measurement devices, etc., can solve the problems of low resolution, high working temperature, poor selectivity, etc., and achieve good selectivity and stability. High and simple preparation process

Inactive Publication Date: 2014-09-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous advancement of technology and the improvement of gas detection requirements, people have gradually realized that single oxides also have disadvantages such as poor stability, high operating temperature, low resolution, and poor selectivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh Zn(NO 3 ) 2 and Al(NO 3 ) 3 The reagents are made into a solution, and then NaOH and NaOH are configured according to the ratio of 3:1. 2 CO 3 Mix the alkaline solution. Under the reaction condition of ensuring a constant pH=9~11, the double-drop co-precipitation method is used to drop the metal salt solution and the mixed alkali solution into distilled water at the same time, stir and keep a constant pH=9~11. Then place the suspension in a water bath at 65°C for aging for 24-48 hours, then filter and wash with suction, and finally put the filter cake in a constant temperature oven at 85°C to dry at a constant temperature to obtain the ZnAl composite metal hydroxy compound. The composite metal hydroxy compound was placed in a nitrogen-protected muffle furnace, and calcined at a high temperature of 600° C. for 2 hours to obtain a zinc-aluminum composite metal oxide. Mix the zinc-aluminum composite metal oxide powder with distilled water and evenly spread it o...

Embodiment 2

[0015] Weigh Zn(NO 3 ) 2 and Fe(NO 3 ) 3 The reagents are made into a solution, and then NaOH and NaOH are configured according to the ratio of 3:1. 2 CO 3 Mix the alkaline solution. Under the reaction conditions of ensuring a constant pH = 9~11, the double-drop co-precipitation method is used to drop the metal salt solution and the mixed alkali solution into distilled water at the same time, stir and keep a constant pH=10~12, and then the suspension Place in a water bath at 65°C for aging for 24-36 hours, then filter and wash with suction, and finally put the filter cake in an incubator at 85°C to dry at a constant temperature to obtain the ZnFe composite metal hydroxy compound. Put the obtained composite metal hydroxy compound into a nitrogen-protected muffle furnace, and calcinate at a high temperature of 700° C. for 2 hours to obtain a zinc-iron composite metal oxide. Mix the zinc-iron composite metal oxide powder with distilled water, spread it evenly on the ceramic...

Embodiment 3

[0017] Weigh Co(NO 3 ) 2 and Al(NO 3 ) 3 The reagents are made into a solution, and then NaOH and NaOH are configured in a ratio of 4:1 according to the amount of substances. 2 CO 3 Mix the alkaline solution. Under the reaction conditions of ensuring a constant pH = 7~9, using the double-drop co-precipitation method, the metal salt solution and the mixed alkali solution are added dropwise to distilled water at the same time, stirred and kept at a constant pH = 9~11, and then the suspension Place it in a water bath at 65°C for aging for 24-36 hours, then suction filter and wash, and finally put the filter cake in a constant temperature oven at 85°C to dry at a constant temperature to obtain a CoAl composite metal hydroxy compound. Put the CoAl composite metal hydroxy compound into a nitrogen-protected muffle furnace, and anneal at a high temperature of 800° C. for 3 hours to obtain a cobalt-aluminum composite metal oxide. Mix the cobalt-aluminum composite metal oxide powd...

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Abstract

The invention provides a preparation method of a composite gas-sensitive material having high sensitivity, high selectivity and high stability and belongs to the field of functional materials. The invention mainly relates to a preparation method of a crystal-non-crystal metal oxide composite gas-sensitive material. The crystal-non-crystal metal oxide composite gas-sensitive material has high sensitivity to organic volatile compounds such as acetone, ethanol, 2-chloroethanol, chlorobenzene and formaldehyde, and has good heat stability and good selectivity. The preparation method has simple processes.

Description

technical field [0001] The invention relates to a composite gas-sensitive material with high sensitivity, high selectivity and high stability, which belongs to the field of functional materials and can be used for detecting harmful gases in the environment. Background technique [0002] Due to the increasingly serious air pollution at home and abroad, the demand for high-performance gas-sensitive materials is also increasing. People can use sensors made of high-performance gas-sensitive materials to monitor toxic, harmful, and explosive gases in the workshop, or to detect whether the exhaust gases of enterprises are qualified, so as to curb the air pollution caused by the illegal exhaust emissions of enterprises. Therefore, it is undoubtedly of great significance to study the properties of semiconductor gas-sensing materials and apply the theory to practice, so that the gas-sensing materials will gradually develop towards practical use. At present, various single metal oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00C04B41/85
Inventor 李曦峰张玲牟宗刚
Owner UNIV OF JINAN
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