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Kelvin probe force microscopy on surfaces: Investigation of the surface potential of self-assembled monolayers on gold

Lu, J. and Delamarche, E. and Eng, L. and Bennewitz, R. and Meyer, E. and Guntherodt, H. J.. (1999) Kelvin probe force microscopy on surfaces: Investigation of the surface potential of self-assembled monolayers on gold. Langmuir, Vol. 15, H. 23. pp. 8184-8188.

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Official URL: http://edoc.unibas.ch/dok/A5839446

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Abstract

The local contact potential difference (CPD) between different linear alkanethiols self-assembled as monolayers on Au substrates was investigated with Kelvin probe force microscopy (KPFM). Our results demonstrate that KPFM simultaneously provides information on the sample topography and its contact potential down to a lateral resolution of 100 nm. The reported CPD measurements allow the distinction between regions in the monolayer comprising thiol molecules with chemically different terminal head groups down to a resolution of 3 meV. Further more, the CPD values measured in monolayers having one type of functionality vary with the chain length of the molecules in the film, which is consistent with a dipole-layer model. Variations in the length of the alkyl chain reveal a linear dependence as a function of the (-CH2-) units in the chain, with an increase in the CPD potential of 14.1 +/- 3.1 mV per (-CH2-) unit.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Chemical Society
ISSN:0743-7463
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:44

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