Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Nanostructures and Clusters
O 46.7: Vortrag
Mittwoch, 13. März 2013, 12:00–12:15, H45
The effect of oxygen on the morphology of Au nanoparticles — •Darius Pohl1,2, Alexander Surrey1,2, Ludwig Schultz1,2, and Bernd Rellinghaus1 — 1IFW Dresden, P.O. Box 260116, D-01171 Dresden, Germany. — 2TU Dresden, Institute for Solid State Physics, Dresden, Germany.
We present an easy procedure for the synthesis of single crystalline gold nanoparticles with a mean diameter of 4 nm by using a DC-sputtering in an argon-oxygen gas mixture. Morphology population statistics for a large amount of particles have been determined to quantify the influence of oxygen. It is found that the particles undergo a structural transition from predominantly icosahedral to single crystalline particles with increasing amount of oxygen. Aberration-corrected HRTEM investigations prove that likewise prepared single crystalline nanoparticles are defect and oxygen free. In contrast, icosahedral particles prepared in pure argon atmosphere reveal the presence of edge dislocations pointing to an energetic disfavoring already at these relatively small particle sizes. The impact of oxygen on the early growth process of Au nanoparticles will be discussed in detail.