Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces
O 69.7: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Functionalization of Si(553)-Au surface with small organic molecules — •Sandhya Chandola1, Julian Plaickner1, Eugen Speiser1, Conor Hogan2, and Norbert Esser1 — 1Leibniz-Institut für Analytische Wissenschaften-ISAS- e.V. Schwarzschildstrasse 8, 12489 Berlin, Germany — 2Istituto di Struttura della Materia-CNR (ISM-CNR), via Fosso del Cavaliere 100, 00133 Rome, Italy
The adsorption of small organic molecules on vicinal Au- Si(111) surfaces is shown to be a versatile route towards controlled growth of ordered organic-metal hybrid 1D nanostructures. We investigate molecular adsorption by establishing a direct connection between optical spectra and surface structure via ab-initio calculations. Optical spectra and their theoretical interpretation gives us information on structural and electronic properties of the system. We use a surface-sensitive and polarization-sensitive optical technique, Raman Spectroscopy (RS), to investigate the adsorption of toluene-3,4-dithiol (TDT) molecules on Si(553)-Au surfaces. As a first step, we use RS to investigate TDT adsorption on a SERS (surface enhanced Raman scattering) substrate which is known to produce significant surface enhancement when adsorbed with molecules. Distinctive vibrational modes have been identified and correlate well with the vibrational frequencies of the TDT molecule. RS of TDT adsorption on Si(553)-Au shows very weak vibrational modes which appear to be related to the molecular vibrations. In order to increase the detection sensitivity of the molecules on the Si(553)-Au surface, silver islands were deposited on the surface to increase the density of hot spots and thus enhance the Raman signal.