Issue 23, 2008
From the journal:

Journal of Materials Chemistry

Ligand exchange of CdSe nanocrystals probed by optical spectroscopy in the visible and mid-IR†

Birgit von Holt,a   Stefan Kudera,bc   Andreas Weiss,a   Tobias E. Schrader,a   Liberato Manna,d   Wolfgang J. Parake  and  Markus Braun*a  

* Corresponding authors

a Lehrstuhl für Biomolekulare Optik, Ludwig-Maximilians-Universität München, Oettingenstrasse 67, München, Germany

b Center for Nanoscience, Ludwig-Maximilians-Universität München, Amalienstraße 54, München, Germany

c Max Planck Institute for Metals Research, Dept. New Materials and Biosystems, Heisenbergstr. 3, Stuttgart, Germany

d National Nanotechnology Laboratories of CNR-INFM, Via Arnesano, Lecce, Italy

e Fachbereich Physik, Philipps-Universität Marburg, Renthof 7, 35037 Marburg, Germany

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.

Graphical abstract: Ligand exchange of CdSe nanocrystals probed by optical spectroscopy in the visible and mid-IR

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Article information

DOI
https://doi.org/10.1039/B720009A
Article type
Paper
Submitted
02 Jan 2008
Accepted
03 Apr 2008
First published
28 Apr 2008

J. Mater. Chem., 2008,18, 2728-2732

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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 and M. Braun, J. Mater. Chem., 2008, 18, 2728 DOI: 10.1039/B720009A

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