Phase-separated alkanethiol self-assembled monolayers investigated by non-contact AFM

We investigated phase-separated self-assembled monolayers (SAMs) of alkanethiol molecules on Au(1 1 1) surfaces as model samples which have nanometer-scale domain distribution by non-contact atomic force microscopy (NC-AFM). We made SAMs composed of 1-decanethiol (CH 3–(CH 2) 9–SH; C 10) and 1,10-de...

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Bibliographic Details
Published in:Applied surface science 2003-03, Vol.210 (1), p.99-104
Main Authors: Ichii, T., Fukuma, T., Kobayashi, K., Yamada, H., Matsushige, K.
Format: Article
Language:English
Subjects:
Alkanethiol
Energy dissipation
Kelvin-probe force microscopy
Non-contact atomic force microscopy
Phase separation
Self-assembled monolayers
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Summary:We investigated phase-separated self-assembled monolayers (SAMs) of alkanethiol molecules on Au(1 1 1) surfaces as model samples which have nanometer-scale domain distribution by non-contact atomic force microscopy (NC-AFM). We made SAMs composed of 1-decanethiol (CH 3–(CH 2) 9–SH; C 10) and 1,10-decanedithiol (HS–(CH 2) 10–SH; C 10D). We obtained topographic, surface potential (SP) and energy dissipation images. The obtained topographic images suggested the sample surface was composed of closely packed C 10 monolayer domains and C 10D domains. The SP of C 10 domains were about 100–150 mV higher than that of C 10D domains. The energy dissipation on C 10D domains were larger than that on C 10 domains. We discussed the origins of difference in SP and the dissipated energy on the C 10 and C 10D domains.
ISSN:0169-4332
1873-5584
DOI:10.1016/S0169-4332(02)01487-3