Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 11: Thin organic films II
DS 11.1: Vortrag
Dienstag, 28. März 2006, 11:15–11:30, GER 38
Molecular Ordering of Thin DNA Base Films on Vicinal Silicon Surfaces — •Simona Silaghi1, Dietrich Zahn2, and Norbert Esser1 — 1ISAS - Institute for Analytical Sciences, Department Berlin, D-12489, Germany — 2Institute of Physics, TU Chemnitz, D-09107, Germany
The adsorption of DNA bases particularly on semiconductor surfaces is motivated by biosensing and nanotechnology applications [1]. An important issue for future applications is the capability to fabricate well-ordered structures with characteristic dimensions in the nanometer range. In this sense vicinal surfaces may serves as suitable templates for molecular ordering. Here, reflectance anisotropy spectroscopy (RAS) is employed for monitoring the molecular ordering of DNA bases on vicinal H:Si(111). It is observed that DNA bases behave differently on the vicinal surfaces. The first transition dipole moments of adenine and thymine molecules align mainly perpendicular to the step edge direction while for guanine and cytosine they align parallel to this direction [2]. Additionally, time-resolved RAS measurements demonstrate the sensitivity to the biomolecular/inorganic interface formation.
[1] K. Meeker and A.B. Ellis, J. Phys. Chem. B 104 (2000) 2500
[2] D.R.T. Zahn, S.D. Silaghi, C. Cobet, M. Friedrich, and N. Esser, Phys.stat.sol. (b) 242 (13) (2005) 2671