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题名: UV Raman Spectroscopic Study on TiO2. II. Effect of Nanoparticle Size on the Outer/Inner Phase Transformations
作者: Zhang, Jing1;  Xu, Qian1, 2;  Li, Meijun1;  Feng, Zhaochi1;  Li, Can1
通讯作者: 李灿
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-02-05
DOI: 10.1021/jp808013k
卷: 113, 期:5, 页:1698-1704
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The mechanism of the size-dependent outer/inner phase transformation in ultrafine TiO2 particles with narrowed size distribution was intensively investigated using UV Raman spectroscopy, X-ray diffraction, and transmission electron microscopy. Particle size is found to be the critical parameter determining the onset transition temperature and nucleation performance. The transformation temperature was decreased with the decrease of initial particle size. Rutile nucleates at interfaces of the contacting anatase grains (<60 nm). The free surface, interface, and bulk are all likely to work as rutile nucleation sites for large particles(>= 60 nm). Thermal stability of nanoscale titania is significantly enhanced by the presence of La2O3 even with surface coverage less than 5%, which blocks the outer/inner phase transformation of nano anatase. A model was devised to describe the phase transformation as a function of particle size and to predict the phase stability.
关键词[WOS]: ANATASE-TO-RUTILE ;  NANOCRYSTALLINE TITANIA ;  SEMICONDUCTOR NANOCRYSTALS ;  PHOTOCATALYTIC ACTIVITY ;  PARTICLE-SIZE ;  SOLAR-CELLS ;  SURFACE ;  DEPENDENCE ;  HYDROGEN ;  STABILITY
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000262902800010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/102481
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Zhang, Jing,Xu, Qian,Li, Meijun,et al. UV Raman Spectroscopic Study on TiO2. II. Effect of Nanoparticle Size on the Outer/Inner Phase Transformations[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(5):1698-1704.
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