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"Ligand exchange of CdSe nanocrystals probed by optical spectroscopy in the visible and mid-IR" B. von Holt, S. Kudera, A. Weiss, T. E. Schrader, L. Manna, W. J. Parak, M. BraunJournal of Materials Chemistry 18 (2008) 2728–2732. Abstract: Optical spectroscopy in the UV/VIS and mid-IR spectral range was applied for a quantitative analysis of ligand exchange in CdSe semiconductor nanocrystals. CdSe cores from a single synthesis run were used for the study in order to ensure identical starting conditions for the exchange of different ligand molecules. From the analysis of the mid-IR spectrum the binding of the ligand molecules was monitored and the ligand exchange rate was obtained. DFT calculations yielded the vibrational normal modes of the system CdSe/ligand and allowed the identification of specific marker bands for the binding of different ligands to the nanocrystal surface. BMO authors (in alphabetic order): Markus Braun Tobias Schrader Birgit von Holt Andreas Weiss Assoziierte Projekte: High-frequency wavepackets - ultrafast vibrational spectroscopy in the time domain Shaping of light pulses in the femtosecond time regime Generation of light pulses on the time scale of 5 fs  WWW-Version |