水热合成长叶片状锐钛矿相TiO_2纳米晶  

Preparation of Long Lamina Anatase TiO_2 Nano-crystal by Hydrothermal Method

作　　者：韦志仁[1] 刘新辉[1] 武明晓[1] 彭翔宇[1] 李志强[1] 

机构地区：[1]河北大学物理科学与技术学院,河北省光电信息材料重点实验室,保定071002

出　　处：《人工晶体学报》2010年第3期691-695,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50472037,No.50672020,No.50772027);河北省自然科学基金(E2006001008,E2007000197)

摘　　要：本文以水热法合成的钛酸钠纳米管为前驱物,经过二次水热处理制备出了叶片状纯锐钛矿相TiO2晶体。采用高分辨TEM、XRD对晶体形貌和结构进行了分析。在纯水条件下,TiO2晶体长度达到1～2μm,宽度100～200nm,钛酸钠纳米管全部转化为锐钛矿相TiO2。pH值为11时,除了合成出微米级叶片状TiO2以外,还有少量未反应的钛酸钠纳米管以及由纳米管展开的膜片物,反映了钛酸钠纳米管向纯锐钛相叶片状TiO2转化的中间过程,显示在特定的水热条件下锐钛相TiO和钛酸钠互相转化。In this paper,sodium titanate crystal fibers synthesized by hydrothermal method were used as precursors to prepare long lamina anatase TiO2 nano-crystal by further hydrothermal process.The crystal morphology and structure were analyzed using high-resolution TEM and XRD.When pH is 7,the long lamina anatase TiO2 nano-crystal was synthesized,it is 1-2 μm long,100-200 nm wide.When pH is 11,there is some no-reaction nano-tube and membranous substances besides the long lamina anatase TiO2,and it reflect the process of pure sodium titanate nanotubes change to leaf-shaped anatase TiO2.The experiment results show that anatase TiO2 and sodium titanate nano-tube can mutually transfer in hydrothermal condition.

关 键 词：水热法 二氧化钛 钛酸钠 纳米晶体 

分 类 号：TB34[一般工业技术—材料科学与工程]