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Colloidal nanostructures as building blocks for macroscopic thermoelectric materials with electron-crystal phonon-glass properties

Published online by Cambridge University Press:  01 February 2011

Marcus Scheele ,
Niels Oeschler ,
Katrin Meier ,
Andreas Kornowski ,
Christian Klinke  and
Horst Weller
Marcus Scheele
Affiliation:
scheele@chemie.uni-hamburg.de, University of Hamburg, Hamburg, Germany
Niels Oeschler
Affiliation:
oeschler@cpfs.mpg.de, Max Planck Institute of Chemical Physics of Solids, Dresden, Germany
Katrin Meier
Affiliation:
kmeier@cpfs.mpg.de, Max Planck Institute of Chemical Physics of Solids, Dresden, Germany
Andreas Kornowski
Affiliation:
kornowsk@chemie.uni-hamburg.de, University of Hamburg, Hamburg, Germany
Christian Klinke
Affiliation:
klinke@chemie.uni-hamburg.de
Horst Weller
Affiliation:
weller@chemie.uni-hamburg.de, University of Hamburg, Hamburg, Germany
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Abstract

We demonstrate the shape- and size-controlled synthesis of colloidal ∼10 nm bismuth telluride nanoparticles stabilized by organic ligands in solution. Post-synthetic ligand exchange with oleic acid allows for a quick and simple ligand removal by consecutive washing with basic ammonia solution. Mild spark plasma sintering yields a macroscopic nanostructured bulk solid with nanograins unaltered in size and shape. We present the full thermoelectric characterization with an emphasis on the thermal properties of this material. It will be shown that thus prepared nanostructured bulk solids possess significantly altered physical properties typical for materials with high surface-to-volume-ratios. These alterations have the potential to lead to improved thermoelectric performances benefiting from their phonon-glass electron-crystal behavior.

Keywords

thermoelectricnanostructurecolloid
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD08-12
Copyright
Copyright © Materials Research Society 2010

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