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Charge-influenced structural properties of electrically connected platinum nanoparticles

Published online by Cambridge University Press:  21 March 2011

R. N. Viswanath ,
J. Weissmüller ,
R. Würschum  and
H. Gleiter
R. N. Viswanath
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
J. Weissmüller
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
R. Würschum
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany Technische Universität Graz, Institut für Technische Physik, Graz, Austria
H. Gleiter
Affiliation:
Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
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Abstract

We present results of a study motivated by the recent suggestion that the properties of nanocrystalline materials with a large surface-to-volume ratio can be tuned by inducing spacecharge regions at interfaces by means of an applied voltage. As an example, we investigate the reversible variation of the lattice constant of platinum nanoparticles immersed in an aqueous 1M KOH electrolyte as a function of applied potential. It is found that a reversible volumetric strain of up to 1.2 % can be induced, corresponding to pressures of up to 3.2 GPa. We present the experimental set-ups for in-situ X-ray diffraction with an electrochemical cell. The variation of the space charge at the metal-electrolyte interface results in a variation of the surface stress f as a function of the applied potential, which is not an electrocapillary effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y6.10
Copyright
Copyright © Materials Research Society 2001

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References

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