Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 33: Teilchen und Cluster II

O 33.4: Vortrag

Montag, 7. März 2005, 11:30–11:45, TU EB107

Multi-step laser tailoring for the production of monodisperse metal nanoparticles — •D. Blazquez, N. Borg, C. Hendrich, F. Hubenthal und F. Träger — Experimentalphysik I, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology - CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, D-34132 Kassel

We have produced metal nanoparticles (NP) by deposition of atoms on dielectric substrates followed by diffusion and nucleation. This usually leads to rotational ellipsoidal NP with broad size and shape distributions. As demonstrated earlier, particles of undesired size can be removed with nanosecond laser pulses. The technique is based on the size and shape dependent surface plasmon resonance (SPR) frequencies of metal NP and allowed us to prepare nanoparticles with a size disribution as narrow as about 10 %. Here, we describe recent experiments to explore the potential of the method to further narrow the size distribution. Using continuously tunable laser light Ag NP on quartz substrates have been tailored in a multi-step process. The nanoparticles were characterized by atomic force microscopy and optical spectroscopy. The potential of the method will be discussed.