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Surface potential studies of self-assembling monolayers using Kelvin probe force microscopy

✍ Scribed by Lü, J.; Eng, L.; Bennewitz, R.; Meyer, E.; Güntherodt, H.-J; Delamarche, E.; Scandella, L.

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
307 KB
Volume
27
Category
Article
ISSN
0142-2421

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✦ Synopsis

The local contact potential di †erence (CPD) of di †erent self-assembled n-alkanethiol monolayers on Au substrates has been measured using Kelvin probe force microscopy (KPFM). Our results demonstrate that KPFM can be used to obtain topography and CPD information simultaneously. The measured CPDs show a clear chemical contrast, allowing us to distinguish between thiol molecules with di †erent terminal groups. The CPD values of the same terminal group are found to vary with chain length, which is explained in the context of the dipole layer model.

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