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MM: Fachverband Metall- und Materialphysik
MM 37: Nano structured materials V
MM 37.5: Talk
Thursday, March 29, 2007, 17:45–18:00, H4
SAXS charakterization of silver nanoparticles in glass — •Michael Leitner1, Gerhard Seifert2, Bogdan Sepiol1, and Andrei Stalmashonak2 — 1Fakultät für Physik, Universität Wien, Strudlhofgasse 4, 1090 Wien — 2Institut für Physik, Optik, Martin-Luther-Universitat Halle-Wittenberg, Hoher Weg 8, Halle (Saale)
Glass samples containing silver nanoparticles are of great interest to the optical community because of their special optical properties caused by surface plasmon resonance, resulting in absorption of characteristic wavelengths. Initially spherical particles of about 30 nm diameter can be transformed to ellipsoids by femtosecond laser irradiation in the visible range, which results in optical dichroism of the sample [1]. This method allows the production of high-temperature polarisators.
Here we present SAXS-measurements on the nanoparticles’ size distribution and the shape perpendicular to the surface of the sample. The process of interest is as follows: the axis parallel to the polarisation of the laser and elongated at comparably low intensities of the laser shortens at high intensities. Moreover, we can validate the existence and the shape of holes in the matrix created by the dissolution of nanoparticles by a DC field. After the dissolution process no characteristic absorption is detectable any longer and the shape validation by optical means is impossible.
[1] M. Kaempfe, G. Seifert, K.-J. Berg, H. Hofmeister, H. Graener, Eur. Phys. J. D 16, 237-240 (2001)