Molecular orientation and electronic structure of epitaxial bucky ferrocene (Fe(C60(CH3)5)C5H5) thin films
Molecular orientation and electronic structure of epitaxial bucky ferrocene (Fe(C60(CH3)5)C5H5) thin films
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DOI：
10.1021/jp037668v
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发表时间：
2004-07-15
影响因子：
3.3
通讯作者：
Saiki, K
中科院分区：
文献类型：
--
作者：
Kaji, T;Shimada, T;Saiki, K
在MoS_2（0001）衬底上生长了一种C-60和二茂铁的混合分子--二茂铁（Fe（C-60（CH_3）（5））C_5 H_5）的单晶外延薄膜。通过使用由微通道板（MCP）放大的反射高能电子衍射（RHEED），发现膜的晶格常数从1-2单层（ML）的11.3 +/- 0.2埃减小到3 ML或更厚的10.2 +/- 0.2埃。这两种晶体的晶格常数都与衬底的晶格常数不相称，表明是一种新型的外延生长。用紫外光电子能谱（UPS）测量了各厚度薄膜的价电子结构，并确定了与外延膜中分子取向有关的分子轨道能级。
Single crystalline epitaxial films of bucky ferrocene (Fe(C-60(CH3)(5))C5H5), a hybrid molecule of C-60 and ferrocene, were grown on MoS2(0001) substrates. By using reflection high-energy electron diffraction (RHEED) amplified by a microchannel plate (MCP), it was found that the lattice constant of the film decreased from 11.3 +/- 0.2 Angstrom at 1-2 monolayer (ML) to 10.2 +/- 0.2 Angstrom at 3 ML or thicker. Both of the lattice constants were incommensurate with that of the substrate, which indicates a new type of epitaxial growth. Valence electronic structures of the films at each thickness were measured with ultraviolet photoelectron spectroscopy (UPS) and the energy levels of molecular orbitals were identified in relation to the molecular orientation in the epitaxial film.