非化学计量比SnO~2~-~x纳米微晶材料的XRD,XPS和ESR研究

采用溶胶凝胶法, 以无水四氯化锡及异丙醇为原料, 制得非化学计量比的SnO~2~-~x纳米微晶材料。透射电镜图片显示700℃焙烧2h得到的粉体的粒度为20nm,由X射线衍射及X射线光电子能谱的分析可知, 300℃焙烧2h得到颗粒边界部分原子无规排布的纳米粉体, 而700℃焙烧2h得到的是晶格趋于完整的纳米微晶,它们都存在氧空位及晶格缺陷, 利用这些结论可以解释SnO~2~-~x纳米微晶材料中出现的顺磁信号。

Study on the non-stiochiometric SnO~2~-~x nanocrystalline material by XRD,XPS and ESR

Non-stiochiometric SnO~2~-~x nanocrystalline material were successfully prepared through Sol-Gel process using anhydrous stannic chloride and iso-propyl alcohol. TEM observation shows that the mean diameter of the powder sintered at 700℃ for 2 hours is about 20nm. By the investigation of XRD and ESR, we can conclude that the sample sintered at 300℃ for 2 hours was amorphous and it grew into nanocrystalline will the oxygen vacancies and defects when sintered at 700℃ for 2 hours. Using these conclusion, the ESR signals and the difference between the two SnO~2~-~x samples are explained.