Molecular-scale noncontact atomic force microscopy contrasts in topography and energy dissipation on c(4x2) superlattice structures of alkanethiol self-assembled monolayers

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Fukuma, Takeshi ; Ichii, Takashi ; Kobayashi, Kei ; Yamada, Hirofumi ; Matsushige, Kazumi (2004)
  • Publisher: American Institute of Physics
  • Journal: JOURNAL OF APPLIED PHYSICS, volume 95, issue 3, pages 1,222-1,226 (issn: 0021-8979)

Alkanethiol self-assembledmonolayers 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.
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