Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: POSTERS Colloids, Nanoparticles and Aggregates
CPP 21.4: Poster
Wednesday, February 27, 2008, 16:00–18:30, Poster A
Influence of self assembled monolayers on local structuring of silicon — •Harald Graaf, Thomas Baumgärtel, and Christian von Borczyskowski — Center of Nanostructured Materials and Analytics, TU Chemnitz, 09107 Chemnitz, Germany
The local anodic oxidation of hydrogen-terminated silicon by an atomic force microscope under ambient conditions is an established method for the preparation of silicon oxide nanostructures. The kinetics of this process have been studied in detail by several groups and the influence of humidity, applied electric field, shape of the cantilever and exposure time respectively tip veocity has been developed.
We will discuss here the influence of two organic alkenes with different headgroups (CH3 and COOCH3) covalently bond to silicon surfaces. Both monolayers showed similar trends in the influence of the oxidation e.g. higher threshold voltage compared to hydrogen terminated silicon. A decreasing hydrophobic character of the monolayer is accompanied by a broadening and flattening of the formed oxide structure. More hydrophilic surfaces led also to a lower increase in threshold voltage with increasing tip velocity.