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High-gas-sensitivity multi-element-compounding metal oxide, preparing method and application

A composite metal and oxide technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of insufficient sensitivity and responsiveness, and achieve the effects of wide application range, high stability and good selectivity

Inactive Publication Date: 2016-03-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN104048996A discloses a method for preparing a crystalline amorphous metal oxide composite gas-sensing material, but the working temperature of the gas-sensing material prepared by it is above 240°C, and its sensitivity and responsiveness are not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh Ni (NO 3 ) 2 And Cd(NO 3 ) 2 The reagent is prepared into a solution, and Fe(NO) is added in the ratio of Fe:Ni=1:20 3 ) 3 , Then add 25% concentrated ammonia water, stir well, then add NaOH alkali solution dropwise until pH=8~10. Then the suspension was placed in a water bath at 75°C for 48h aging, filtered and washed with suction, and finally the filter cake was placed in a thermostat at 85°C for constant temperature drying to obtain NiCdFe ternary composite metal hydroxy compound. The composite metal hydroxy compound is put into a nitrogen-protected muffle furnace and calcined at a high temperature of 700° C. for 2 hours to obtain a zinc-aluminum composite metal oxide. The zinc-aluminum composite metal oxide powder and distilled water are mixed and evenly smeared on the ceramic sheet, dried, and then annealed in a muffle furnace at 400°C for two hours to obtain the gas sensor to be tested. This element is used for ethanol gas-sensitivity detection, and the sensi...

Embodiment 2

[0031] Weigh Co(NO 3 ) 2 And Fe(NO 3 ) 3 The reagents are prepared into a solution, and then acetylacetone is added, and after fully stirring it, add NaOH and Na in a 3:1 ratio according to the amount of the substance. 2 CO 3 Mix the alkali solution. Until pH=8~10. Then the suspension was placed in a water bath at 75°C for 48h, and then filtered and washed with suction. Finally, the filter cake was placed in a thermostat at 85°C and dried at a constant temperature to obtain the CoFe composite metal hydroxy compound. Put the obtained composite metal hydroxy compound into a nitrogen-protected muffle furnace, and calcinate at a high temperature of 600° C. for 2 hours to obtain a zinc-iron composite metal oxide. The zinc-iron composite metal oxide powder and distilled water are mixed and evenly smeared on the ceramic sheet, dried, and then annealed in a muffle furnace at 400°C for two hours to obtain the gas sensor to be tested. The element has a sensitivity of up to 48 at 100°C i...

Embodiment 3

[0033] Weigh Co(NO 3 ) 2 And Cr(NO 3 ) 3 The reagent is prepared into a solution, and then Fe(NO) is added according to the ratio of Fe:Co=1:15 3 ) 3 , Then add 25% concentrated ammonia water, then add ethylenediamine, stir well, and then add dropwise 4:1 ratio to configure NaOH and Na 2 CO 3 Mix the alkali solution until the pH=10-11. Then the suspension was placed in a water bath at 75°C for 48h aging, filtered and washed with suction, and finally the filter cake was placed in a thermostat at 85°C and dried at a constant temperature to obtain a CoCrFe composite metal hydroxy compound. Put the composite metal hydroxy compound into a muffle protected by nitrogen. The CoCrFe composite metal hydroxy compound is put into a nitrogen-protected muffle furnace, and annealed at a high temperature of 800° C. for 3 hours to obtain a cobalt-aluminum-iron ternary composite metal oxide. The cobalt-aluminum-iron composite metal oxide powder is mixed with distilled water and evenly smeared on...

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PUM

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Abstract

The invention discloses a high-gas-sensitivity multi-element-compounding metal oxide, a preparing method and an application. The preparing method includes the steps that metal ions corresponding to p-type semiconductor metal oxide, metal ions corresponding to n-type semiconductor metal oxide and doped metal ions are mixed, a coordination agent is added, precipitating, aging, drying and roasting are carried out, and the high-gas-sensitivity multi-element-compounding metal oxide is obtained. The valence state of doped metal is lower than the valence state of p-type semiconductor metal or the valence state of the doped metal is higher than the valence state of n-type semiconductor metal. The compounded metal oxide has p-n junctions capable of improving sensitivity and responsiveness; meanwhile, a proper amount of doping treatment is carried out, and the ternary or quaternary compounding metal oxide is formed; the structure of the multi-element-metal-compounding hydroxyl compound is adjusted and controlled by adding the coordination agent, and therefore the structure of a metal-compounding oxide material is controllable.

Description

Technical field [0001] The invention relates to the field of functional materials, in particular to a multi-element composite metal oxide with high gas sensitivity, a preparation method and application. Background technique [0002] Due to the rapid development of modern industry, there are more and more types and quantities of gas raw materials used in industrial production and toxic and harmful gases produced in the production process. These gases not only pollute the environment, but may also cause explosions, fires, and human body poisoning. . The rapid and accurate detection of these gases will effectively prevent the occurrence of such malignant events. Therefore, the demand for high-performance gas-sensitive materials is increasing. Currently, various single metal oxides (such as ZnO, SnO 2 , Fe 2 O 3 Etc.) has been widely used in gas sensors. However, single metal oxide gas-sensitive materials have disadvantages such as low sensitivity, high working temperature, and poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00C04B41/87
CPCC04B41/5025C04B41/87G01N27/00
Inventor 张玲李曦峰牟宗刚
Owner UNIV OF JINAN