Molecular assemblies on insulating ultrathin films analyzed by nc-AFM and KPFM

Glatzel, Thilo and Zimmerli, Lars and Meyer, Ernst. (2008) Molecular assemblies on insulating ultrathin films analyzed by nc-AFM and KPFM. Israel Journal of Chemistry, Vol. 48, H. 2. pp. 107-116.

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Official URL: http://edoc.unibas.ch/dok/A5262095

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Recently porphyrin-based molecules have proven to be promising candidates to form self-assembled structures oil insulating Surfaces. Their close similarity to hemoglobin and chlorophyll-based molecules makes them promising candidates for functional building parts in molecular electronics. To analyze their opto-electronic activity, new measurement methods have to be applied. We investigated the formation of such Molecular assemblies On Ultrathin insulating films by means of a room temperature non-contact atomic force microscope (NC-AFM) in combination with a Kelvin probe force microscope (KPFM). As a substrate we used a Cu(111) Surface, where either ultrathin KBr or NaCl films are deposited. Oil those surfaces the evaporated cyano-porphyrins ire forming one- and two-dimensional structures that are comparable to file ones observed oil bulk alkali halides. The simultaneously measured surface potential clearly shows a material contrast between the molecules and the insulating films. Finally, we succeeded in obtaining variations of the surface potential induced by the molecular assemblies at the molecular level.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:27
Deposited On:22 Mar 2012 13:57

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