Study on ESR and inter-related properties of vacuum-dehydrated nanotubed titanic acid
Study on ESR and inter-related properties of vacuum-dehydrated nanotubed titanic acid
复制标题
DOI：
10.1016/j.jssc.2003.11.027
复制
发表时间：
2004-04
影响因子：
3.3
通讯作者：
S. Zhang;W. Li;Zhensheng Jin;Jianjun Yang;Jingwei Zhang;Z. Du;Zhijun Zhang
中科院分区：
文献类型：
--
作者：
S. Zhang;W. Li;Zhensheng Jin;Jianjun Yang;Jingwei Zhang;Z. Du;Zhijun Zhang
纳米管钛酸（H2 Ti 2 O 4（OH）2）是一种新型材料。采用透射电子显微镜、X射线衍射、电子自旋共振（ESR）、漫反射光谱等方法研究了其真空脱水产物的电子自旋共振（ESR）及其相关性质。结果表明，在真空（-0.1MPa）和100°C下处理后，纳米管状的H2 Ti 2 O 4（OH）2晶格中产生了单电子俘获氧空位（SETOV），其ESR信号g=2.003。g=2.003 ESR信号强度（IESR）随处理时间增加。真空脱水的H2 Ti 2 O 4（OH）2的可见光吸收能力与IESR成正比。在100°C真空脱水过程中，H2 Ti 2 O 4（OH）2纳米管缩短，但其晶型保持不变。探讨了SETOV的形成机理。
Nanotubed titanic acid (H2Ti2O4(OH)2) is a novel kind of material. The electron spin resonance (ESR) and inter-related properties of its vacuum-dehydrated product were investigated by means of transmission electron microscopic, X-ray diffraction, ESR, diffuse reflectance spectra. The results showed that after treatment under vacuum (−0.1MPa) at 100°C, single-electron-trapped oxygen vacancies (SETOV), characterized by a symmetrical ESR signal (g=2.003), were generated in nanotubed H2Ti2O4(OH)2crystal lattice. The g=2.003 ESR signal intensity (IESR) increased with treatment time. SETOV played the role of F centers, the visible-light absorption power of vacuum-dehydrated H2Ti2O4(OH)2was proportional to IESR. During vacuum dehydration at 100°C, the H2Ti2O4(OH)2nanotubes shortened but its crystalline form kept unchanged. The formation mechanism of SETOV was discussed.