DIRECT OBSERVATION OF EPITAXIALLY GROWN C-60 CRYSTALS AND MOLECULES ON VACUUM-DEPOSITED MGO FILMS

被引:6
作者
TANAKA, N
KITAGAWA, T
KACHI, T
KIZUKA, T
机构
[1] Department of Applied Physics, School of Engineering, Nagoya University, Chikusa-ku, Nagoya
关键词
D O I
10.1016/0304-3991(93)90070-E
中图分类号
TH742 [显微镜];
学科分类号
摘要
Epitaxially grown crystals of C-60 are prepared on (001) vacuum-deposited MgO films by successive deposition of MgO and C-60 on a heated NaCl(001) cleaved surface. C-60 grows as single-crystalline triangular islands with fee structure on the MgO films from 180 to 200 degrees C. The epitawial relations are (111)[110](C60)//(001)[010](C60) and (111)[110](C60)//(001)[100](C60) as a result of Volmer-Weber growth. The islands do not have twin-like defects like those of C-60 crystals previously grown on NaCl(001) substrates. High-resolution electron microscopy shows the images of aggregates of C-60 molecules as ring-like black contrast at the edge of islands prepared at room temperature and 180 degrees C. Image simulations of one C-60 molecule located on MgO crystals of 10 and 20 nm thickness are presented, and the possibility of detection of the molecule is discussed in relation to the use of imaging under off-Bragg condition.
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页码:533 / 538
页数:6
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