Self-assembled monolayers of decanethiol on Au(111)/mica |
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Authors: | H Klein W Blanc R Pierrisnard C Fauquet Ph Dumas |
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Institution: | (1) GPEC (UMR 6631 du CNRS), case 901, Université de la Méditerranée 13288 Marseille Cedex 9, France, FR |
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Abstract: | We report here a preparation for thin gold films on mica substrates. We have investigated the influence of the substrate temperature
and the evaporation rate on the morphology of the films. After careful outgasing of the substrate, 100 nm of Au is evaporated
onto the mica surface maintained at high temperature. After slow cooling, ex situ characterizations are performed using AFM and STM. For our purposes, the best compromise between roughness and grain size
is found to occur for an evaporation rate of 2 ?s-1 onto a mica substrate maintained at 460 C. We have used these substrates for STM and AFM study of decanethiol self-assembled monolayers (SAMs). We present results
for gold samples immersed for a few seconds in decanethiol solutions, revealing an incomplete organization of the films. The
organization process is discussed through comparison between AFM and STM data recorded on the SAMs. Then we present molecular
resolution STM pictures of ordered SAMs for longer immersion times.
Received 25 May 1999 |
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Keywords: | PACS 61 16 Ch Scanning probe microscopy: scanning tunnelling atomic force scanning optical magnetic force etc - 68 35 Bs Surface structure and topography |
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