Preparation method for Ag doped ZnO nanometer gas sensitive material

A gas-sensing material and nanotechnology, applied in the field of gas-sensing sensors, can solve the problems of affecting material performance, increasing energy consumption, poor selectivity, etc., and achieve the effects of low preparation cost, stable performance and simple preparation process

Inactive Publication Date: 2017-04-19
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal oxides respond to most gases, and the sensitivity, response / recovery time, etc. can be improved by constructing metal oxides with different structures and crystal forms, but the problem of poor selectivity is difficult to solve
[0003] The gas-sensing performance of the material can be improved by metal oxide surface modification, metal / noble metal doping and other processes, which are widely used in the field of gas sensors, but most Ag-doped / modified metal oxides adopt a two-step method. That is, first synthesize zinc oxide nanomaterials by chemical method or hydrothermal method, and then modify them with Ag; Dong Lihong (ZL201310148498.1), Wang Debao (ZL201310097328.5) and others invented the method of directly synthesizing Ag / ZnO, but all require high temperature treatment , while increasing energy consumption, the structure and performance of the material will change under high temperature conditions, which will affect the performance of the material

Method used

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  • Preparation method for Ag doped ZnO nanometer gas sensitive material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Zinc nitrate and silver nitrate were dissolved in 80 mL of deionized water at a molar ratio of 100:2, and the cationic concentration was 0.1M to obtain solution A; according to the molar ratio of triethanolamine and urea of ​​100:4, the total molar mass of the two was 1 / 4 of the cationic concentration. 2 times weighed triethanolamine and urea dissolved in water, the volume ratio of water and complexing agent was 20:1, to obtain solution B; mixed solution A and solution B, stirred for 10min and then added to the polytetrafluoroethylene reactor, 80 The reaction was carried out at ℃ for 10 hours. After the reaction, the sample was centrifuged and precipitated. After repeated washing with deionized water and absolute ethanol for 2 to 3 times, the sample was dried at 60 ℃ for 10 hours to obtain Ag-doped ZnO nanomaterials.

[0018] The powder prepared in this embodiment is dispersedly coated on the gas sensor test element of the six-pin ceramic tube, and the response to aceton...

Embodiment 2

[0020] Dissolve zinc nitrate and silver nitrate in 80 mL of deionized water at a molar ratio of 100:1, and the cation concentration is 0.15M to obtain solution A; according to the molar ratio of ethylene glycol and urea of ​​100:2, the total molar mass of the two is the cation concentration Weigh 2 times of ethylene glycol and urea and dissolve in water, the volume ratio of water and complexing agent is 15:1, to obtain solution B; mix solution A and solution B, stir for 10min, then add to polytetrafluoroethylene reactor, The reaction was carried out at 70°C for 11 hours. After the reaction, the sample was centrifuged and precipitated. After repeated washing with deionized water and absolute ethanol for 2 to 3 times, the sample was dried at 60°C for 10 hours to obtain Ag-doped ZnO nanomaterials.

[0021] The powder prepared in this example is dispersedly coated on the gas sensor test element of the hexapod ceramic tube, and the WS-30A gas sensor test system is used to test the r...

Embodiment 3

[0023] Zinc acetate and silver nitrate were dissolved in 80 mL of deionized water at a molar ratio of 100:5, and the cation concentration was 0.2M to obtain solution A; The molar weight is 3 times of the cation concentration. Weigh ethylene glycol and hexamethylenetetramine and dissolve them in water. The volume ratio of water to complexing agent is 20:1 to obtain solution B; mix solution A and solution B and stir for 10 minutes After that, it was added into a polytetrafluoroethylene reactor and reacted at 100°C for 7 hours. After the reaction, the sample was centrifuged and precipitated, washed repeatedly with deionized water and absolute ethanol for 2 to 3 times, and dried at 60°C for 10 hours to obtain Ag-doped ZnO nanomaterials.

[0024] The powder obtained in this example is dispersedly coated on the gas sensor test element of the hexapod ceramic tube, and the WS-30A gas sensor test system is used to test the response to acetone gas at different concentrations, and the se...

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Abstract

The invention discloses a preparation method for an Ag doped ZnO nanometer gas sensitive material. Water soluble zinc salt and silver nitrate are dissolved in 80 mL of deionized water according to the molar ratio of 100: (1-5), and the positive ion concentration ranges from 0.1 M to 0.2 M; a two-composition complexing agent and deionized water are premixed, the volume ratio of water to the complexing agent is (10-20): 1, and stirring is carried out till the complexing agent is completely dissolved; the positive ion solution and the complexing agent solution are mixed, after being stirring for 10 min, the mixed solution is added into a polytetrafluoroethylene reaction kettle, a reaction is conducted for 6-12 hours at the temperature of 65-120 DEG C, after the reaction is finished, a sample in subjected to centrifugation and repeatedly washed with deionized water and absolute ethyl alcohol for 2-3 times, the sample is dried for 4-12 hours at the temperature of 60-70 DEG C, and the Ag doped ZnO nanometer material is obtained. After Ag doping, the selectivity and sensitivity of the ZnO nanometer material can be greatly improved, and the problem that the selectivity of the ZnO is poor is solved. The preparation method has the beneficial effects that the preparation process is simple, the preparation cost is low, the performance is stable, the gas selectivity is good, and the preparation method has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of gas-sensitive sensors, in particular to a method for preparing an Ag-doped zinc oxide gas-sensitive material. Background technique [0002] Metal oxides such as ZnO, SnO 2 , WO3, etc. are widely studied gas-sensing materials because of their excellent performance, environmental friendliness, abundant resources, and low price. However, metal oxides respond to most gases, and the sensitivity, response / recovery time, etc. can be improved by constructing metal oxides with different structures and crystal forms, but the problem of poor selectivity is difficult to solve. [0003] The gas-sensing performance of the material can be improved by metal oxide surface modification, metal / noble metal doping and other processes, which are widely used in the field of gas sensors, but most Ag-doped / modified metal oxides adopt a two-step method. That is, first synthesize zinc oxide nanomaterials by chemical method or hyd...

Claims

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Application Information

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IPC IPC(8): C01G9/02G01N27/12
CPCC01G9/02C01P2004/03G01N27/126G01N27/127
Inventor 何丹农葛美英孙健武尹桂林金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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