Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 19: Teilchen und Cluster II

O 19.7: Vortrag

Dienstag, 9. März 2004, 12:45–13:00, H39

TEM and STM Study of Gold Nanoparticles — •M. Smetanin1, S. Schulze1, F. Müller1, D. Piasta2, S. Spange2, and M. Hietschold11Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107, Chemnitz, Germany — 2Chemnitz University of Technology,Institute of Chemistry, D-09107 Chemnitz, Germany

Metal nanoclusters are interesting candidates for nanostructured materials and nanoelectronic digital circuits. We have investigated the structure of chemicaly synthesized gold nanoparticles of different sizes with and without thiol coating. Gold nanoparticles with a diameter of 3 nm and 10 nm were studied using transmission electron microscopy (TEM) and scanning tunneling microscopy (STM). TEM investigations show the crystalline structure of gold nanoparticles in all cases. High energy electron difraction (HEED) shows that the lattice structure of nanoparticles of 10 nm average diameter corresponds to fcc independently from coating. But for smaller clusters with an average diameter of 3 nm the coexistence of bcc and fcc seems to be possible. Moreovere we have observed a dependency of the thiol coating for these phases. Furthermore we have investigated the shapes of gold clusters by STM for comparison with TEM experiment.

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DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg