Submolecular-Resolution Studies on Metal-Phthalocyanines by Noncontact Atomic Force Microscopy
Submolecular-Resolution Studies on Metal-Phthalocyanines by Noncontact Atomic Force Microscopy
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DOI：
10.1143/jjap.43.4691
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发表时间：
2004-07
影响因子：
1.5
通讯作者：
T. Yoda;T. Ichii;T. Fukuma;K. Kobayashi;Hirofumi Yamada;K. Matsushige
中科院分区：
文献类型：
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作者：
T. Yoda;T. Ichii;T. Fukuma;K. Kobayashi;Hirofumi Yamada;K. Matsushige
采用非接触原子力显微镜（NC-AFM）研究了在Au（111）表面沉积的酞菁铜（CuPc）薄膜。发现了CuPc多层膜分子行间距具有周期性调制的结构。薄膜上每个分子的亚分子特征被成功成像。利用尖端与化学活性分子轨道（如最高已占据分子轨道（HOMO）和最低未占据分子轨道（LUMO））的空间电子密度分布之间的化学相互作用来解释这种对比。此外，在分子尺度上研究了纳米原子力显微镜对单层膜成像的能量耗散。讨论了耗散图像的高分辨率对比度与分子随机涨落的关系。
Copper phthalocyanine (CuPc) thin films deposited on Au (111) surfaces were investigated by noncontact atomic force microscopy (NC-AFM). Structures with a periodic modulation of the spacing between the molecular rows of CuPc multilayer films were found. Submolecular features of each individual molecule on a film were successfully imaged. The obtained contrast was interpreted by the chemical interactions between a tip and the spatial electron density distribution of chemically active molecular orbitals such as highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). In addition, the energy dissipation in the NC-AFM imaging of monolayer films was studied on a molecular scale. The obtained high-resolution contrast in the dissipation images was discussed in connection with the random fluctuation of molecules.