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Controlled Preparation and Characteristic of SnO2 One-Dimensional Nanostructures

Author: ZengChunLai
Tutor: TangDongSheng
School: Hunan Normal University
Course: Condensed Matter Physics
Keywords: Tin dioxide One-dimensional nanomaterials Chemical vapor deposition method Doping
CLC: O472
Type: Master's thesis
Year: 2007
Downloads: 157
Quote: 0
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Abstract


SnO 2 is a typical semiconductor-type metal oxides, the band gap of 3.6eV (300K). SnO 2 one-dimensional materials with special physical properties , and has a wide range of applications in optoelectronic devices , gas sensors, transparent electrodes , solar cells and other fields , so that it attracted much attention . Improved one-dimensional nanomaterials preparation method to obtain a discrete good , with a specific micro - structure of SnO 2 current research focus is becoming a one-dimensional structure system . In this paper, the chemical vapor deposition method by controlling the reactant ratio and the oxygen content in the carrier gas macroscopic experimental conditions , SnO 2 control the growth of one-dimensional nanostructures , successful SnO 2 various horizontal scale nanowires , nanobelts , and needle-like nanostructures . Experimental results show that : SnO 2 followed in the one-dimensional structure of the growth process , the growth mechanism may be closely related to the relative content of the growing point near the tin with oxygen , regulate the relatively high temperature growth point the nearby tin and oxygen content can precisely control SnO 2 growth of one-dimensional nanostructures . By changing the air pressure and substrate position of the growth of the region , the success of the most vertical substrate growth the SnO 2 micro- nano- cluster and tree spiny , test tube brush -like SnO 2 self - assembling micro and nano structures , and shallow skip analysis of the mechanism of the growth of these structures and possible causes . Substrate at a high vapor concentration is prepared by the self - assembled structure of the key . Tin dioxide has excellent gas sensing characteristics important applications in the field of gas sensors . In order to further improve the selectivity and sensitivity of gas to improve the stability of their work , while its operating temperature down to room temperature within SnO 2 -dimensional nanostructures doped molybdenum try and get the initial success . Through contrast the doped molybdenum experiments under two different conditions , the use of chemical vapor deposition prepared by melting point metal doped SnO structure conditions were discussed .

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