Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.64: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Functionalization of 6H-SiC(0001) and quartz surfaces with benzo[ghi]perylene-1,2-dicarboxylic anhydride dye through different organic linker molecules — •Deb Kumar Bhowmick1, Manfred Bartsch1, Linda Stegemann2, Cristian A. Strassert2, and Helmut Zacharias1,2 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, 48149 Münster, Germany — 2Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität, Münster, Germany
Due to different band gaps of semiconductors which control the electronic interactions between substrates and adsorbates, the hybrid semiconductor-organic interfacial systems have versatile applications like transistors, microelectronics, and biosensor. The covalent functionalization gives the stability to the hybrid system [1]. In this study we have chemically functionalized benzo[ghi]perylene-1,2-dicarboxylic anhydride dye on 6H-SiC and quartz surfaces through three different silane linker molecules, e.g., 11-aminoundecyl triethoxysilane (AUDTES), 3-aminopropyl triethoxysilane (APTES), para-aminophenyl trimethoxysilane (PAPTMS). These linkers have different electron conductivities [2]. These systems are characterized by ATR-IR and XPS, and are further studied by confocal fluorescence microscopy. These fluorescence measurements show a gradual decrease of the fluorescence lifetime from 7.6 ns to 1.3 ns from a non-conductive to a conductive linker.
[1] M. Auernhammer, et al., Applied Physics Letters 100, 101601 (2012) [2] D. K. Bhowmick, et al., Small 8, 592 (2012)