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Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 21: Nanoparticles

CPP 21.1: Talk

Tuesday, March 8, 2005, 09:45–10:00, TU C243

Morphology of tempered gold nanoparticle thin films as a function of film thickness — •Stephan V. Roth1, Harald Walter2, Rainer Gehrke1, and Peter Müller-Buschbaum31HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany — 2CSEM SA, Badenerstrasse 569, CH-8048 Zürich, Switzerland — 3TU München Physik Department LS E13,James-Franck-Str.1, D-85747 Garching, Germany

Controlling the morphology of noble metal nanoparticle layers is of high technological and scientific interest. The broad field of application of such layers includes solar cells [1], bio-recognition and optocelectronic devices. This is due to the plasmon resonance in noble metal nanoparticles leading to strong absorption bands in the visible light. The plasmon resonance depends strongly on the nanoparticle layer structure and morphology. A very simple route to structuring is low-temperature annealing [2]. We investigated the evolution of evaporated gold nanoparticle layers as a function of nanoparticle layer thickness (3nm-8nm) and annealing time at 300C (≤24h). To characterize the samples we used optical transmission interferometry and grazing incidence ultra small-angle x-ray scattering (GIUSAX). The GIUSAX measurements were performed at the beamline BW4 at HASYLAB. We present first results, showing an increasing most-prominent in-plane length with annealing time and correlate it with the changes in the plasmon resonance.

[1] M. Westphalen et al., Solar Energy Materials & Solar Cells 61, 97 (2000)

[2] P. Müller-Buschbaum et al., Europhys. Lett. 40, 655 (1997)

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