Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 76: Organic, Polymeric, Biomolecular Films - also with Adsorbates

O 76.7: Talk

Thursday, February 28, 2008, 16:45–17:00, MA 043

Growth of phospholipid membrane systems on self-organized semiconductor templates — Gerald Trummer, Gregor Hlawacek, Daniel Pressl, and •Christian Teichert — Montanuniversität Leoben, Austria

Here, we use atomic force microscopy (AFM) to study the formation of solid-supported lipid bilayers on a variety of nanofaceted self-organized SiGe films on Si(001)[1] and ion eroded semiconductor surfaces [2] in comparison to smooth Si(001) wafers. 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-Phosphoethanolamine (POPE) and 1,2-Dipalmitoyl-sn-Glycero-3-Phosphocholine (DPPC) were used as model systems. The resulting film morphology and the change of surface roughness have been investigated as a function of initial roughness and morphology of the substrate. Phase imaging is used to distinguish between the soft lipid layers and the hard semiconductor substrate. On SiGe templates showing a dislocation network it was found that the ridge trench structures appearing at the surface guide the terrace edges of DPPC layers. When the lipid coverage is very low, 100 nm x 100 nm pits of {105} faceted SiGe film act as preferential deposition sites for lipid bilayers resulting in ordered arrays of small POPE islands.

[1] C. Teichert, Phys. Rep. 365 (2002) 335. [2] S. Facsko, et. al., Science 285 (1999) 1551; T. Bobek, et al., Phys. Rev. B 68 (2003) 085324.