Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.82: Poster

Monday, March 8, 2004, 16:30–19:00, Poster A

Nano structured material in electrodynamic traps — •Silko Barth and Dieter Gerlich — Department of Physics, Technische Universität Chemnitz, 09126 Chemnitz, Germany

The goal of this project is the mass spectrometrical and optical characterization of simple structures of ligand stabilized clusters. Small agglomerates (e.g., dimers or trimers) of these chemically produced nanoparticles are stored in a controlled inert atmosphere or under UHV conditions using time dependent electric fields. The new trapping apparatus offers numerous possibilities for determining physical and chemical properties of single isolated objects. Experimental parameters are n, the number of particles in an agglomerate, its charge and temperature, and the environment (e.g., buffer or reactant gas). Optical detection and analysis is based on laser methods such as differential light scattering, laser induced fluorescence, or non linear optical effects. The method is applied to water soluble CdTe nanoparticles and small agglomerates (n < 10) of them. In a first step the material is injected via µ m sized water droplets. The evaporation process if followed in real time. After complete drying only the semiconductor particles remain, allowing one to investigate them in detail. Finally, it is also planned to modify or remove the ligand shell.