期刊
CRYSTENGCOMM
卷 14, 期 6, 页码 2278-2282出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce06314j
关键词
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资金
- National Basic Research Program of China (973 Program) [2012CB933704]
- State Key Laboratory of Optoelectronic Materials and Technologies, China [2010-RC-3-3]
- Production, Research Project of Guangdong Province
- Ministry of Education, China [2010B090400020]
- Department of Education, Guangxi Zhuang Autonomous Region of China [200103YB061, 201010LX188]
- Guilin University of Technology
Hierarchical rutile TiO2 mesocrystals (RTMs) were synthesized on a large scale by a one-step hydrothermal method under a weak acid assistant. The structure and morphologies of these RTMs are investigated by detailed transmission electron microscopy (TEM). It is demonstrated that the branched structures of RTMs exhibit a sword-like shape at the end with exposed {101} facets, and a twinned {200} plane is found in each branched nanorod. Additionally, another {101} twinned plane is formed at the interface of the trunk and branch with a 65 degrees angle. Interestingly, it has been found that homogeneous nanocrystals with diameters below 14 nm are epitaxially attached on the surface of the {110} planes with a lower surface energy at an angle of about either 113 degrees or 67 degrees. Correspondingly, a model of crystal planes as building blocks of RTMs is proposed to illustrate the complex structure of the RTMs. The growth mechanism of 3D RTMs is ascribed to the nanocrystals-oriented attachment and the formation of rutile {101} twinned structures.
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