HYDROTHERMAL SYNTHESIS OF NANOSIZED SNO2

Uniform nanosized SnO2 particles were prepared by a hydrothermal metho d using SnCl4 . 5H(2)O as the starting material. The influences of rea ction temperature, acidity in reaction medium and concentration of rea ctant on the formation, morphology and particle size of SnO2 crystalli te were investigated, The XRD analysis showed that the products formed at different temperatures (120 similar to 220 degrees C) in acid medi um were all tetragonal SnO2. With raising reaction temperature, partic les grew gradually. Their particle sizes were ca. 2 nm (120 degrees C) similar to nm (220 degrees C) in [SnCl4]=1 mol/L, pH=1.45, respective ly. Decreasing the acidity in reaction medium appropriately (for examp le pH=1.45) favored a decrease in particle size and an increase in yie ld.