SIZE EFFECT ON ABSORPTION EDGES OFULTRA-FINE SnO_2 NANOPARTICLES
- 物理技术－已发表论文 
采用超细过滤方法 ,分别制备含有平均线度小于 2nm的超细SnO2 纳米晶粒的酸性和碱性溶胶溶液 .通过动态光散射、X射线衍射和晶粒透射电子显微镜像测量 ,确定了SnO2 晶粒的线度 .对其光吸收谱测量发现 ,超细过滤后酸性和碱性溶胶溶液中晶粒的带边光吸收能量均有明显蓝移 .分析结果表明 ,SnO2 晶粒的线度减小是同类晶粒带边光吸收蓝移的主要原因 .Aqueous sols containing nanocrystalline SnO 2 particles with sizes less than 2 nm were prepared by ultra-filtration from original acidic and alkaline sols with SnO 2 particles. The sizes of SnO 2 nanocrystallines were determined by dynamic light scattering, X-ray diffraction, and computer analysis of nanocrystalline images of transmission electron microscopy. Blue shifts of absorption edges of the nanocrystallines were observed in both the ultra-filtrated acidic and alkaline sols. The results show that the blue shifts of the SnO 2 nanocrystallines are mainly attributable to the size decrease for the same kind of nanocrystallines.