Dresden 2009 – scientific programme

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SYSO: Symposium Self-organizing Surfaces and Interfaces

SYSO 3: Self-Organizing Surfaces and Interfaces - Posters

SYSO 3.26: Poster

Wednesday, March 25, 2009, 17:30–19:30, P3

Systematical Structural Investigation of Self-Assembled Monolayers formed from Dithiolanes on Gold (111) — •Xia Stammer, Asif Bashir, Christian Hülsbusch, Martin Kind, and Christof Wöll — Lehrstuhl für Physikalische Chemie 1, Ruhr-Universität Bochum, Universitätsstraße 150, D-44801 Bochum, Germany

Self-assembled monolayers (SAMs) have attracted considerable interest since they offer a huge potential for various applications including corrosion protection, nanoelectronics, biological compatibility of metal implants and other surface modifications. The most common self-assembling molecules used for self-assembly on gold are thiols and disulfides, which have been extensively investigated in recent years. In order to improve the stability of thiol-based SAMs, we have investigated a new class of molecule, which contain two S-atoms per molecule. The formation and the structure of self-assembled monolayers of 4-alkane-1,2-dithiolane with different alkane chain length and Phenyl-dithiol on gold were explored. We have characterized these SAMs by contact angle goniometry (CA), infrared reflection absorption spectroscopy (IRRAS), scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). IR-spectra of the isolated dithiolanes have been calculated using DFT. Overall, the 4-alkane-1,2-dithiolanes form a less crystalline film than alkanethiols of comparable chain lengths. However, the STM results of the phenyl-dithiol support well ordered and densely packed chelating molecules on the gold surface.