The change in resistance of nanostructured metals with respect to an applied field is believed to be due to a change in carrier concentration and hence a linear variation of resistance with the surface charge is expected. In this article, we propose a different approach to explain the resistance variation based on a change in the effective thickness of the film due to a shift of the electron density profile resulting from the applied surface charge. The change in effective thickness together with its effect on surface scattering of electrons account for the majority of the observed variation in resistance. The thin film geometry with different thicknesses and hence a controlled variation of the surface-to-volume ratio allows a deep quantitative understanding and interpretation of the observed phenomena. The model presented in this work shows that a nominal nonlinear response of the resistance of a metal on electrochemically applied surface charge does not necessarily indicate an onset of a redox reaction.
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15 November 2008
Research Article|
November 18 2008
Electric field induced reversible tuning of resistance of thin gold films
S. Dasgupta;
S. Dasgupta
a)
1Institute of Nanotechnology,
Forschungszentrum Karlsruhe GmbH
, P.O. Box 3640, D-76021 Karlsruhe, Germany
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R. Kruk;
R. Kruk
1Institute of Nanotechnology,
Forschungszentrum Karlsruhe GmbH
, P.O. Box 3640, D-76021 Karlsruhe, Germany
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D. Ebke;
D. Ebke
2Thin Films and Nanostructures, Department of Physics,
University of Bielefeld
, P.O. Box 100 131, D-33501 Bielefeld, Germany
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A. Hütten;
A. Hütten
1Institute of Nanotechnology,
Forschungszentrum Karlsruhe GmbH
, P.O. Box 3640, D-76021 Karlsruhe, Germany
2Thin Films and Nanostructures, Department of Physics,
University of Bielefeld
, P.O. Box 100 131, D-33501 Bielefeld, Germany
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C. Bansal;
C. Bansal
1Institute of Nanotechnology,
Forschungszentrum Karlsruhe GmbH
, P.O. Box 3640, D-76021 Karlsruhe, Germany
3School of Physics,
University of Hyderabad
, Hyderabad AP 500 046, India
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H. Hahn
H. Hahn
1Institute of Nanotechnology,
Forschungszentrum Karlsruhe GmbH
, P.O. Box 3640, D-76021 Karlsruhe, Germany
4Joint Research Laboratory Nanomaterials,
Technische Univerität Darmstadt and Forschungszentrum Karlsruhe GmbH
, 64287 Darmstadt, Germany
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a)
Electronic mail: [email protected].
J. Appl. Phys. 104, 103707 (2008)
Article history
Received:
April 06 2008
Accepted:
September 25 2008
Citation
S. Dasgupta, R. Kruk, D. Ebke, A. Hütten, C. Bansal, H. Hahn; Electric field induced reversible tuning of resistance of thin gold films. J. Appl. Phys. 15 November 2008; 104 (10): 103707. https://doi.org/10.1063/1.3020526
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