Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Supramolecular Aggregates
CPP 1.7: Vortrag
Montag, 26. März 2007, 11:30–11:45, H37
Competitive Adsorption of Functionalized Molecules on Semiconductor Nanocrystal Surfaces — Klementyna Szwaykowska1,2, Chinnappan Raja3,4, •Thomas Blaudeck1,3, Frank Cichos1,5, and Christian von Borczyskowski3 — 1POM, TU Chemnitz, 09107 Chemnitz, Germany — 2Engineering and Applied Sciences, California Institute of Technology, Pasadena, CA 91125, USA — 3OSMP, TU Chemnitz, 09107 Chemnitz, Germany — 4ABMC, Kansas State University, Manhattan, KS 66506, USA — 5Molecular Nanophotonics, U Leipzig, 04103 Leipzig, Germany
Inorganic/organic aggregates from semiconductor nanocrystals and functionalized molecules such as porphyrins are considered building blocks in future nanoelectronicsas they may provide control on the charge and energy transfer processes [1, 2]. We report on the formation process and the stability of aggregates comprising CdSe and CdSe/ZnS nanocrystals and TOPO ligands in toluene at ambient conditions. Applying steady-state spectroscopy to binary and ternary mixtures we compare the results in presence and absence of additional molecules. The experiments show that the formation kinetics is related to by the absolute concentration of the compounds in parallel to their molar ratio. The importance of the local TOPO concentration at the NC surface indicates a dynamic equilibrium governing the number of adsorption sites available. The findings are discussed in the light of Monte-Carlo simulations.
[1] E. Zenkevich et al., J. Phys. Chem. B 109, 8679 (2005).
[2] D. Kilin et al., J. Photochem. Photobiol. B (2006, in print).