水热沉淀法合成SnO_2纳米晶

Nanocrystalline SnO_2 Synthesised by Means of Hydrothermal Precipitation

用水热沉淀法合成了不同粒径的 Sn O2 纳米晶 ,属于四方晶系 ,空间群为 P4/ mnm。计算表明 :随焙烧温度的升高 ,Sn O2 晶粒度增大 ;而平均晶格畸变率则随晶粒度的增大而减小 ,表明粒子越小晶格畸变越大 ,晶粒发育越不完整。TEM分析结果表明 :所合成的 Sn O2 纳米粒子基本呈球形 ;随焙烧温度的升高 ,Sn O2 粒子的粒径增大。热失重分析表明 :水热沉淀法所合成的 Sn O2 纳米粉末中杂质含量很少 ,纯度高。

Nanocrystalline SnO 2 with different particle sizes has been prepared by means of hydrothermal precipitation. The resulting SnO 2 nanometer size powders, which are basically spherical in shape according to TEM, are tetragonal in structure with space group P4/mnm. Calculation shows that the crystallite size of SnO 2 increases with increase of the calcination temperature, but that the average crystal lattice distortion rate decreases with increase of crystallite size. The smaller the particle, the bigger the crystal lattice distortion and the slower the crystal growth rate. Weight loss analysis indicates the prepared SnO_2 is very slightly impure.