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Fabrication and Gas Sensing Property of ZnO-based Nanorods Array

Author: ChenWeiLiang
Tutor: BieLiJian
School: Tianjin University of Technology
Course: Materials Physics and Chemistry
Keywords: ZnO Nanorod arrays Gas Sensing Properties Al3 doped Au modified Photoluminescence Invasive
CLC: TB381
Type: Master's thesis
Year: 2010
Downloads: 79
Quote: 0
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Abstract


ZnO is one of the earliest use of gas-sensitive materials, reducing gas or flammable gas with good gas sensing performance. Sensing properties of ZnO particles and thin films have been extensively studied, but the prevalence of low sensitivity, selectivity and poor shortcomings. The ZnO nanorods one-dimensional material with a specific surface area greater than the film, and overcome the disadvantage of particles at high temperatures easily reunion shows excellent gas sensing performance. Of these one-dimensional nanomaterials the doping modification, can effectively improve and improve its gas sensing performance. Alumina ceramic tube using a two-step chemical solution method Mr. grow ZnO nanorod arrays, and then prepared ZnO: Al 3 and of ZnO: Au nanorod array system. The results showed that the the ZnO nanorods length of about 1.1μm, between 40-80 nm in diameter, were c-axis oriented crystal structure of the hexagonal wurtzite structure. ZnO and ZnO: Al 3 nanorod array system performance study of ethanol and LPG gas that Al 3 doping concentration of 0.25 wt% (Al / Zn) element to achieve the best sensitivity; ZnO: Al 3 nanorod arrays in the working temperature of 340-380 ℃ has the best gas sensing performance; sensitivity of the gas sensor to 1000 ppm LPG and ethanol 11.5 and 32.8, respectively, at the same time, the gas sensor to 1000 ppm LPG and ethanol response time is less than 30 s and 20 s, respectively. Shows that compared with pure ZnO nanorod arrays, Al 3 doping can improve the sensing properties of ZnO nanorod arrays on LPG and ethanol. Of Gas Sensing Properties of ZnO: Au nanorod array system showed that the highest sensitivity when the Au nano particle size of 11 nm, ZnO: Au nanorod array element, the optimum operating temperature of about 300-340 ℃; ZnO: Au nanorod array system of ethanol and LPG exhibit excellent gas-sensitive properties, and a higher selectivity for ethanol; the sensitivity of the gas sensor of 100 ppm ethanol has reached 63.5, when the ethanol concentration is reduced to 10 ppm, the element sensitivity was still close to 6.5, the response time is about 15 s to 10 ppm of ethanol; the gas sensors to the sensitivity of the 500 ppm LPG was 36.2, and the response time is less than 30 s; Further, ZnO: Au nanorod array system for formaldehyde also showed good Gas Sensing Properties 500 ppm formaldehyde gas sensor sensitivity 35.6. Invasive studies of ZnO nanorod arrays and complex system, ZnO and ZnO: Al 3 nanorod arrays exhibit hydrophobic, ZnO: Al 3 nanorod arrays The contact angle of the system is slightly less than the ZnO nanorod arrays and ZnO: Au nanorod array system performance hydrophilic; photoluminescence study shows pure ZnO nanorod arrays photoluminescence (PL) spectrum consists of two major parts: the part is located in the vicinity of 391 nm near-band-edge ultraviolet emission (NBE), another part of the visible region emission, Al 3 doping peaks appear \does not affect the emission peak; composite system weakened the photoluminescence intensity compared with ZnO nanorod arrays.

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