Direct formation of SiO2/SnO2 composite nanoparticles with high surface area and high thermal stability by sol-gel-hydrothermal process

作者：Li, Zhijie; Shen, Wenzhong; Wang, Zhiguo; Xiang, Xia; Zu, Xiaotao^*; Wei, Qiangmin; Wang, Lumin

来源：Journal of Sol-Gel Science and Technology, 2009, 49(2): 196-201.

DOI：10.1007/s10971-008-1862-5

• SnO2
• SiO2
• Sol-gel
• Hydrothermal
• Nanoparticles

SnO2/SiO2 composite nanoparticles were prepared by sol-gel-hydrothermal process and their physicochemical structure and photocatalytic property were investigated. The results of XRD, TEM and FT-IR indicated that SnO2 crystallites with the tetragonal rutile structure were well-developed directly during hydrothermal process. The SnO2/SiO2 composite nanoparticles owned narrow size distribution, large specific surface area, and good thermal stability. As the presence of 25.0 wt% SiO2, the SnO2 nanoparticles were about 4.0 nm in diameter and the specific surface area was 259.0 m(2)/g. After calcination at 800 degrees C, the crystalline grain size maintained 16.2 nm and the surface area still remained 132.6 m(2)/g. The SnO2/SiO2 composite nanoparticles showed better photocatalytic activity than pure SnO2 nanoparticles.

• 出版日期2009-2
• 单位中国石油大学（北京）; 电子科技大学