Preparation method for Ag doped ZnO nanometer gas sensitive material

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...

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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

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