Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 44: Poster II

HL 44.41: Poster

Thursday, March 11, 2004, 16:30–19:00, Poster A

Selective binding of a peptide to semiconductor surfaces — •Karsten Goede, Peter Busch, and Marius Grundmann — Faculty of Physics and Geosciences, Universität Leipzig, Germany

Self-orgainzed hybrid nanostructures of anorganic semiconductors and organic molecules are being increasingly investigated. Possible future applications, such as bio-sensors and nanoscale electronic or optoelectronic devices, are based on the understanding of the molecular attachment process. This work is focussed on the attachment of a 12-mer peptide to various III-V and group-IV semiconductor surfaces (GaAs, AlAs, GaP, InP, Si, Ge) on the nanometer scale. Tapping-mode atomic force microscopy reveals clearly varying attachment properties of the different surfaces. The semiconductor-specific area coverages are reproducibly found to cover more than two orders of magnitude. These quantitative results will be discussed with respect to chemical and structural properties of both the semiconductors and the peptide. Measuring the phase-lag signal of the probing tip offers further insight into the size-dependent cluster properties on the surface. The dependence of the attachment result on the peptide concentration in solution and the surface washing process will also be presented.