Catalyst-Free Synthesis and Shape Control of CdTe Nanowires
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The procedure reported here allows for the size and shape control of CdTe nanowires by means of colloidal chemistry. Thus, ultrathin, straight, saw-tooth-like and one-sided branched nanowires with zinc blende structures could be synthesized. Their formation does not require any catalyst and is most likely due to the oriented attachment of nanoparticles formed in the beginning of the reaction. The use of oleylamine as a solvent turned out to be crucial in order to achieve CdTe nanowires. The reaction between oleic acid and oleylamine in the presence of CdO proved to be essential, not only to activate the Cd precursor but also to provide reaction conditions facilitating nanowire formation by oriented attachment.
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Catalyst-Free Synthesis and Shape Control of CdTe Nanowires
Abstract
The procedure reported here allows for the size and shape control of CdTe nanowires by means of colloidal chemistry. Thus, ultrathin, straight, saw-tooth-like and one-sided branched nanowires with zinc blende structures could be synthesized. Their formation does not require any catalyst and is most likely due to the oriented attachment of nanoparticles formed in the beginning of the reaction. The use of oleylamine as a solvent turned out to be crucial in order to achieve CdTe nanowires. The reaction between oleic acid and oleylamine in the presence of CdO proved to be essential, not only to activate the Cd precursor but also to provide reaction conditions facilitating nanowire formation by oriented attachment.
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Acknowledgements
We would like to thank Erhard Rhiel and Heike Oetting (University of Oldenburg) for assistance in obtaining TEM images and Andreas Kornowski (University of Hamburg) for taking the HRTEM images. We gratefully acknowledge funding from the EWE Research Group "Thin Film Photovoltaics" of EWE AG, Oldenburg. Furthermore, this work was partly supported by the Federal Ministry of Education and Research (BMBF, project No. 03SF0338C).
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