Noncontact atomic force microscopy study of copper-phthalocyanines: Submolecular-scale contrasts in topography and energy dissipation
Noncontact atomic force microscopy study of copper-phthalocyanines: Submolecular-scale contrasts in topography and energy dissipation
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DOI：
10.1063/1.1690485
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发表时间：
2004-04
影响因子：
3.2
通讯作者：
T. Fukuma;K. Kobayashi;Hirofumi Yamada;K. Matsushige
中科院分区：
文献类型：
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作者：
T. Fukuma;K. Kobayashi;Hirofumi Yamada;K. Matsushige
用非接触原子力显微镜(NC-AFM)研究了MoS_2表面的铜酞菁(CuPc)薄膜。在CuPc单分子膜的形貌图像和耗散图像中都成功地获得了亚分子分辨率。对于地形对比度，特别考虑了短程化学作用的影响，同时讨论了耗散对比度与针尖诱导的分子涨落的关系。在CuPc多层膜上还获得了分子分辨的NC-AFM图像，揭示了单层和多层表面的结构差异。在这些表面上测量的能量耗散显示出明显的差异，反映了薄膜结构稳定性的不同。此外，利用NC-AFM对CuPc单分子膜进行了局部表面修饰。这直接证明了振动悬臂梁中存在通过针尖-样品耗散相互作用向分子传递能量的现象。
Copper-phthalocyanine (CuPc) thin films on MoS2 surfaces were investigated by noncontact atomic force microscopy (NC-AFM). Submolecular resolution was successfully obtained in both topographic and dissipation images of CuPc monolayers. For topographic contrasts, the influence of short-range chemical interactions is particularly considered while the dissipation contrasts are discussed in relation to the tip-induced molecular fluctuations. Molecularly-resolved NC-AFM image was also obtained on CuPc multilayer, which revealed the structural difference between the monolayer and multilayer surfaces. The energy dissipation measured on these surfaces showed distinctive difference reflecting the different structural stabilities in the films. Furthermore, local surface modification of CuPc monolayer was demonstrated by NC-AFM. This is a direct evidence for the existence of energy transfer from the vibrating cantilever to the molecules through dissipative tip–sample interactions.