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MM: Fachverband Metall- und Materialphysik
MM 12: Postersitzung I
MM 12.51: Poster
Monday, March 14, 2011, 17:30–19:00, P5
High Resolution Transmission Electron Microscopy of Organic Molecules on Graphene — •Gerardo Algara-Siller1,2, Goutam Pramanik3, Tanja Weil3, and Ute Kaiser1 — 1Group of Electron Microscopy of Materials Science, Ulm University, Ulm, Germany — 2Technical University Ilmenau, Ilmenau, Germany — 3Department of Organic Chemistry III/Macromolecular Chemistry, Ulm University, Ulm, Germany
Graphene, a one atom thick material, has been proven to be a perfect substrate for TEM investigations. In this work, a graphene substrate was fabricated via micromechanical cleavage and transfered to a Quantifoil grid. In order to reduce contamination on the substrate, graphene was annealed and treated with H2:O2 ion plasma. Solutions of protein based copolymers, cBSA-PEO-TA coated Au nanoparticles (NPs) with different Au-protein ratios were deposited by drop coating on graphene and investigated using an aberration-corrected FEI TITAN 80-300 operated at 80kV acceleration voltage. HRTEM micrographs of the deposited protein based copolymers corroborated that the particle size distribution of the Au NPs is dependant on the Au-protein ratio. Furthermore, due to the low noise graphene substrate, the surrounding protein and single gold atoms forming the NPs can be easily resolved and counted. Thus, we report an approach of lower voltage aberration-corrected HRTEM imaging on graphene towards unraveling the chemistry of inorganic/organic interfaces.