Preparation and Characterization of Antimony-doped Tin Oxide

• Main Author: 林振榮
• Other Authors: 江慧真
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/77239088432201790629

碩士 === 國立新竹教育大學 === 應用科學系碩士班 === 100 === Antimony-doped Tin Oxide (ATO) powders were synthesized using a chemical precipitation method. We use both reactants of Tin Chloride and Antimony(III) Chloride as well as urea or Sodium Hydroxide solution as the precipitant to get precursor. Then the precursor with a doping rate varying from 1 to 9 mol.% of Antimony were calcined at 450℃-1300℃ for two hours. The effects of the various synthesizing parameters, including reaction temperature, the doping amount of Antimony, and the calcination temperature of the precursor were investigated in details. The results of energy dispersive spectroscopy (EDS) measurement ensured the stoichiometric ratio of Sb/Sn in our ATO powders. By the thermogravimetric analysis (TGA), ATO powders stability generated when temperature higher than 450℃.In XRD patterns, all our samples exhibit the tetragonal crystal structure of the parent SnO2 compound and no other impurity phase were observed. Thus we can determine that Sb is indeed doped into the Tin Oxide. The powders calcined higher than 1300℃ was difficult to control the Sb doping content, because the evaporation temperature of the antimony oxide is about 1300oC. The images of scanning electron microscopy (SEM) showed the particle size due to antimony-doped, reaction temperature and calcined at different temperatures. In the Fourier-Transform Infrared Spectrum (FTIR), we observed vibration absorptions of Sn-O at 450-750 cm-1. Deep level emission of SnO2 at 472 nm, 540 nm, 672nm weaked with Sb-doping ratio. Calcination temperature and the Sb-doping ratio will affect the absorption intensity.