非化学计量比SnO_(2-x)纳米微晶材料的XRD,XPS和ESR研究

Study on the Non-stiochiometric SnO_(2-x) Nanocrystalline Material by XRD, XPS and ESR

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.

Non-stiochiometric SnO2-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 20 nm. 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 with the oxygen vacancies and defects when sintered at 700℃for 2 hours. Using these conclusion, the ESR signals and the difference between the two SnO2-x samples are explained.