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O: Fachverband Oberflächenphysik

O 45: Organic-Inorganic Hybrid Systems and Organic Films

O 45.15: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Morphology and Electronic Structure of Tris-HCl crystals on pure and alloyed gold surfaces — •Seyma Nayir and Oğuzhan Gürlü — Istanbul Technical University, Department of Physics, Maslak, 34469, Istanbul, Turkey

Tris-HCl is one of the components of widely used buffer solution Tris-EDTA for the storage of DNA and RNA. Apart from the biological studies and medicine, tris also finds use in solar cell systems as an organic thermal energy storage material. When drop casted from the solution, Tris-HCl crystallizes on gold coated pure mica and gold coated chromium on mica surfaces differently. In this work we investigated the reasons for differences in such crystallization behavior of Tris-HCl. The surface topography and crystalline structure of Tris-HCl deposits were investigated by atomic force microscopy. Additionally we performed Kelvin Probe Force Microscopy measurements in order to measure the local contact potential difference of Tris-HCl crystallites and films on gold surfaces, and calculated the local work function changes. Our results indicate a strong dependence of the crystallization behavior of the Tris-HCl on the electro-static landscape of the host surfaces rather than their morphology.