Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.13: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Photothermal Correlation Spectroscopy on Gold Nanoparticles and Nanorods — •Jonas Buchmann1, Markus Selmke1, Daniel Rings2, Klaus Kroy2, and Frank Cichos1 — 1Institut für Experimentelle Physik I, Universität Leipzig, Deutschland — 2Institut für Theoretische Physik, Universität Leipzig, Deutschland
Photothermal Correlations Spectroscopy (PhoCS) is a detection technique that is based on the release of heat from absorbing nano-objects. The released heat changes the local temperature and the local refractive index to provide an efficient scattering of a probe laser. Thus, absorbing particles diffusing through a the focal volume create signal burst which allow the characterization of the Brownian motion of heated particles - so called hot Brownian motion.
Here we explore the hot Brownian motion of gold nano particles and gold nano rods of various sizes. Among other effects we find an anomalous size dependence of the diffusion coefficient at constant incident heating power, which is explained within the theoretical framework of hot Brownian motion.