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Preparation of Mesoporous ZnO Material and Study on Its Gas Sensing Properties

Author: XuMei
Tutor: SuZhiBin
School: Yanshan University
Course: Materials Physics and Chemistry
Keywords: ZnO thin films Mesoporous Polyethylene glycol Gas Sensing Properties Sol - gel
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 75
Quote: 1
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Abstract


ZnO gas sensors its fast response speed , shorter recovery time , good selectivity and become a hot research field of gas sensors and other small features of the environmental pollution , caused widespread concern . Wherein the pore structure of the ZnO film surface has a great role in optimization for the detection of gas . In this paper, the use of sol - gel method , zinc acetate (Zn (CH 3 COO) 2 · 2H 2 O) as raw material , poly glycol PEG as template synthesized with the pore structure of ZnO thin films of various process parameters on the microstructure , surface morphology and Gas Sensing Properties of ZnO thin films , resulting in some of the following results : 1 . complexing agent can effectively inhibit Zn ( CH 3 < / sub > COO ) 2 · 2H of 2 < / sub > O strong hydrolysis , diethanolamine ( DEA ) do the complexing agent income sol synthesis of ZnO film has good pore structure ; concentration of zinc acetate and adding of PEG on the impact of the ZnO grain size is not obvious ; calcination time than the calcination temperature on the grain size of ; ZnO grains size increases with the water bath temperature increases , the increase is not obvious . 2 with the pore structure of ZnO thin films , the pore size of zinc with acetic acid concentration increases , the hole density first increases and then decreases ; low molecular weight membrane pore and pore density is higher ; aperture with PEG added amount increases ; 500 ° C when the surface of the porous film , the larger pore density ; 70 ° C in a water bath favorable pore structure is formed . 3 static gas distribution method by gas sensing device performance test on the gas sensing tester found : sample there is an optimum heating voltage , higher than that of acetone and ethanol sensitivity ; optimum sintering temperature of 500 ° C ; zinc acetate concentration of 0.6 mol / L is appropriate ; first increased and then decreased with the adding of PEG , the sensitivity of the components , the best content to 0.7 g ; ethanol and acetone sensitivity increases with increasing concentration .

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