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31 Jan 2000

Volume 76, Issue 5, pp. 523-656

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Scanning tunneling microscopy on the formation of lipoamide-cyclodextrin monolayer on Au(111)

Satoshi Yasuda, Hidemi Shigekawa, Iwao Suzuki, Tohru Nakamura, Mutsuyoshi Matsumoto, and Makoto Komiyama

Appl. Phys. Lett. 76, 643 (2000); http://dx.doi.org/10.1063/1.125845 (3 pages) | Cited 6 times

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β-cyclodextrin molecules modified with lipoamide residue (LP-β-CyD) were self-assembled on an Au(111) surface in ethanol solution, and the growth process was studied by scanning tunneling microscopy. At the initial stage, adsorption sites were not only random, but also partially linear ordering, which suggests the existence of some influence by the herringbone structure of the Au(111) surface. According to the macroscopic analysis, the subsequent growth process was explained by the Elovich model, which is based on the repulsive interaction between adsorbed molecules. However, when the immersion time increased, island structures began forming. This result suggests the interaction between LP-β-CyD molecules as attractive, which in fact is more probable in consideration of the possibility of the hydrophobic and the hydrogen bonding interactions between CyD molecules. Finally, formation of a single LP-β-CyD layer was clearly confirmed. © 2000 American Institute of Physics.
Show PACS
68.03.Fg Evaporation and condensation of liquids
68.43.Mn Adsorption kinetics
68.18.-g Langmuir-Blodgett films on liquids
68.35.B- Structure of clean surfaces (and surface reconstruction)
68.55.-a Thin film structure and morphology
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