Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 20: Organische Dünnschichten II

O 20.9: Vortrag

Samstag, 5. März 2005, 12:45–13:00, TU EB202

Post-functionalization of self-assembled alkylsiloxane monolayers for gold colloid adsorption — •Daniel Dahlhaus, Steffen Franzka, Nils Hartmann, and Eckart Hasselbrink — Universität Duisburg-Essen, Campus Essen, Fachbereich Chemie, Universitätsstr. 5, 45141 Essen

Self-assembled monolayers (SAMs) are widely recognized for their use in a range of technological applications, including optoelectronic devices and biological sensors. Depending on the detailed application SAMs with varying terminal groups are required. Of particular interest for the adsorption of gold nanoparticles are SAMs exposing amino and thiol groups. In our experiments we first prepared octadecylsiloxane (ODS) monolayers by immersion of freshly cleaned silicon oxide substrates in a millimolar solution of octadecyltrichlorosilane [1]. For characterization contact angle measurements and atomic force microscopy were used. A chemical functionalization of the ODS monolayers has then been achieved by free-radical bromination using visible light. Subsequently, the bromine groups can be replaced by other functional groups such as amines and thiols [2]. Preliminary results indicate the adsorption of gold colloids on these functionalized ODS monolayers.

[1] N. Hartmann, T. Balgar, R. Bautista, E. Hasselbrink, Surf. Sci., 532-535 (2003) 963.

[2] N. Balachander, C.N. Sukenik, Langmuir, 6 (1990) 1621.