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Doping in Nanowire ZnO and Its Characterization

Author: ShuiZuoYi
Tutor: FanXinHui
School: Xi'an University of Technology
Course: Materials Processing Engineering
Keywords: gas sensor ZnO nanowires doped chemical condition
CLC: O614.241
Type: Master's thesis
Year: 2012
Downloads: 127
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Abstract


When dynamite has exploded,it can produce high temperature & pressure gas, so it has been used widely in all aspects of military application and industry production. However main features of modern wars are to affect seriously surrounding environment when it destroys targets, moreover it is harm for follow-up ground combats and the safety of staff and soldiers. In order to protect the safety of staff and soldiers, when harmful gas emerges, gas sensors can give an alarm immediately, and then take the principle of "drainage before exploration" so as to prevent from harming staff’s health, and even cause death.Therefore researching the high sensitivity and selectivity gas sensors of harmful gas have a great significance.Metal doping can improve gas sensitivity of ZnO nanowires. In this thesis,first pure ZnO nanowires and ZnO nanowires doping different contents of Sn are prepared by physical thermal evaporation method in new type of in atmosphere heat treatment furnace, then nanowire’s morphology, crystal structure, and Photoluminescence(PL) are studied, finally chemical states of Sn in ZnO nanowire are analyzed and Sn’s density’s impact on its chemical states in ZnO nanowire are analyzed, some results are following:(1) The mixture of 3% Sn and 5% Sn exists in the form of mixing with lattice, and it doesn’t have new compound. The mixture of 6% Sn exists in the form of SnO2 set in nanowire, enhancing surface area.(2) When diameter of ZnO nanowire becomes smaller, crystal lattice have less blemish and Photoluminescence(PL) are better, and intensity of glimmer is also increased.(3) ZnO nanowire with 5% SnO is characterized as tetrapod-shaped, and Sn exists in the crystal lattice of ZnO. The effect of ZnO nanowires’morphology on SnO reacts with Zn steam to generate Sn, then Sn successfully mixes into lattice by replacing part Zn atom in ZnO,a series of reactions its longitudinal growth rate nearly keeps in step with cross growth rate.(4) When 4% doped-Sn in ZnO nanowire there is a new morphology,we have analysised with the influence of chemical condition in 4%Sn-doped ZnO nanomaterial,The results is,this ZnO nanomaterial is coaxial nanocables, and it have ZnO、SnO2 and Zn2SnO4,then the analysis of structural shows the formation of Zn2SnO4 in the interface region between the SnO2 core and ZnO shell.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements ) > Zinc Zn
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