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Strain-induced phase transformation and piezoresistivity in VO2 nanowires

Published online by Cambridge University Press:  05 April 2012

A. Sedlmayr ,
R. Mönig ,
S.T. Boles ,
G. Kilibarda  and
O. Kraft
A. Sedlmayr
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
R. Mönig*
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
S.T. Boles
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
G. Kilibarda
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
O. Kraft
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
*
Address all correspondence to R. Mönig atreiner.moenig@kit.edu
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Abstract

We report on the mechanical and electrical response of VO2 nanowires during the application of uniaxial tensile strain at room temperature. Stress–strain curves exhibit plateaus, which are characteristic of reversible transformations. The mechanical data are also discussed in terms of size effects, which is important for applications where the structural integrity is key to the performance of devices. Electrical measurements during straining show a distinct increase in resistivity at the M1–M2 transition, and a strong piezo-resistive effect for the M2 phase, disclosing new opportunities for future nanostructured devices. To our knowledge, this is the first time that piezoresistivity in the M2 phase has been reported.

Type
Research Letters
Information
MRS Communications , Volume 2 , Issue 2 , June 2012 , pp. 41 - 45
Copyright
Copyright © Materials Research Society 2012

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