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Molecular-scale noncontact atomic force microscopy contrasts in topography and energy dissipation on c(4×2) superlattice structures of alkanethiol self-assembled monolayers

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5 Author(s)
Fukuma, Takeshi ; Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-8501, Japan ; Ichii, Takashi ; Kobayashi, Kei ; Yamada, Hirofumi
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Alkanethiol self-assembled monolayers formed on Au(111) surfaces were investigated by noncontact atomic force microscopy (NC-AFM). Dodecanethiol monolayers prepared at 78 °C were imaged by NC-AFM, which revealed that the film is composed predominantly of two different phases of c(4×2) superlattice structures. The obtained molecular-scale NC-AFM contrasts are discussed in comparison with previously reported scanning tunneling microscopy images. We found that the energy dissipation image exhibits a clear difference in its molecular-scale contrast between the two phases. Possible origins of the difference are discussed in relation to the fluctuation and/or stability of the packing structures. © 2004 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:95 ,  Issue: 3 )

Date of Publication:

Feb 2004

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