Microcracked gold films on elastomeric substrates can function as stretchable and deformable interconnects and sensors. In response to stretch or deformation, the design would seek to minimize the change in resistance for stretchable or deformable interconnects; if used as resistive sensors, a large change in resistance would be desired. This research examines the change in resistance upon bending of a microcracked conductor and compares the results with stretching such a conductor. The resistance depends on the strain in the film, which, for bending, is a function of the bending radius and the location of the film within the structure with respect to the neutral plane. The resistance decreases when the gold conductor is under compression and increases when it is under tension. The decrease in resistance under compression is small compared to the increase in resistance under tension, marginally depending on the bending radius. In contrast, the resistance under tension significantly increases with decreasing bending radius. The mechanics model presented here offers a mechanistic understanding of these observations. These results provide guidance for the design of interconnects for flexible and stretchable electronics and for flexible sensors to monitor the magnitude and direction of bending or stretching.
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29 May 2017
Research Article|
June 01 2017
The effects of bending on the resistance of elastically stretchable metal conductors, and a comparison with stretching
O. Graudejus
;
O. Graudejus
a)
1
School of Molecular Science, Arizona State University
, Tempe, Arizona 85287, USA
4
BioMedical Sustainable Elastic Electronic Devices (BMSEED) LLC, Center for Entrepreneurial Innovation (CEI)
, Phoenix, Arizona 85034, USA
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T. Li;
T. Li
a)
2
Department of Mechanical Engineering, University of Maryland
, College Park, Maryland 20742, USA
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J. Cheng;
J. Cheng
2
Department of Mechanical Engineering, University of Maryland
, College Park, Maryland 20742, USA
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N. Keiper;
N. Keiper
3
Center for Adaptive Neural Systems, School of Biological and Health Systems Engineering, Arizona State University
, Tempe, Arizona 85287, USA
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R. D. Ponce Wong;
R. D. Ponce Wong
4
BioMedical Sustainable Elastic Electronic Devices (BMSEED) LLC, Center for Entrepreneurial Innovation (CEI)
, Phoenix, Arizona 85034, USA
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A. B. Pak;
A. B. Pak
3
Center for Adaptive Neural Systems, School of Biological and Health Systems Engineering, Arizona State University
, Tempe, Arizona 85287, USA
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J. Abbas
J. Abbas
3
Center for Adaptive Neural Systems, School of Biological and Health Systems Engineering, Arizona State University
, Tempe, Arizona 85287, USA
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a)
Authors to whom correspondences should be addressed: oliver.graudejus@asu.edu and lit@umd.edu
Appl. Phys. Lett. 110, 221906 (2017)
Article history
Received:
February 26 2017
Accepted:
May 13 2017
Citation
O. Graudejus, T. Li, J. Cheng, N. Keiper, R. D. Ponce Wong, A. B. Pak, J. Abbas; The effects of bending on the resistance of elastically stretchable metal conductors, and a comparison with stretching. Appl. Phys. Lett. 29 May 2017; 110 (22): 221906. https://doi.org/10.1063/1.4984207
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