Preparation And Characterization Of Nanometer-sized Antimony Doped Tin Oxide (ATO) Powders

In this thesis, a comprehensive introduction of electric nanometer-sized powders, especially antimony doped tin oxide was provided, mainly including the development, mechanisms, types and preparation methods. It shows that antimony-doped tin oxide has promising prospect as the electric nanometer-sized powders because of its excellent electrical properties, low cost and easiness to handle.Using SnCl4-5H2O and SbCl3 as precursors, antimony doped tin oxide particles with good electrical properties have been prepared by hydrothermal synthesis. The optimal conditions of this synthesis process were as following: doping ratio was 11%; reaction temperature was 180 ; reaction time was 2h; the temperature and time of calcinations is 700 and 2h. The size of ATO particles obtained is about 20nm,andits resistance can reach 0.2 ,under 0.2MPa pressure.The effects of doping ratio, calcinations temperature and calcinations time on the structure and the particle size have been comprehensively studied. The appropriatecalcinations temperature is about 700 , and the tetragonal SnO2 phase crystalstructure of the particles remained unchanged when Sb was doped to it. As the calcinations temperature increasing and the calcinations time prolong, the size of particles grows and the crystallization tend to be complete.Study on the electrical properties of ATO powders prepared by hydrothermal synthesis was performed in-depth, the most optimal electrical properties are obtained at doping ratio of 11 percent. When the calcinations temperature fell into the scope of 300-400 , its resistance begun to decrease sharply. However, the resistance almost kept unchanged under higher calcinations temperature. Besides, the time of calcinations nearly exhibited no influence on the resistance.