Two-dimensional diffraction of molecular nanosheet crystallites of titanium oxide

被引:208
作者
Sasaki, T
Ebina, Y
Kitami, Y
Watanabe, M
Oikawa, T
机构
[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan
[2] JEOL Ltd, Akishima, Tokyo 1968558, Japan
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2001年 / 105卷 / 26期
关键词
D O I
10.1021/jp010421i
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We have examined two-dimensional diffraction features of novel nanosheet crystallites of quasi-TiO2. A single crystallite gave a face-centered orthogonal array of hl diffraction spots representing a 0.38 nm x 0.30 nm periodicity, which reflects the two-dimensional atomic arrangement in the nanosheet. Diffraction collected from plural crystallites was composed of concentric circles as a result of their random orientation in the TEM grid plane, which were transformed into ovals on tilting the sample stage. Analysis of the "oval-shaped" electron diffraction pattern allowed the direct probing of the reciprocal lattice geometry and its intensity distribution. The reconstructed reciprocal space:is of nested cylinders for multiple nanosheets, and consequently, a set of parallel diffuse rods for one crystallite, being diagnostic of the two-dimensional crystal. The intensity modulation along the reciprocal rods demonstrates the molecular feature of the nanosheet:and possible adsorption of water molecules on it.
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页码:6116 / 6121
页数:6
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