Micro-wrinkling and delamination-induced buckling of stretchable electronic structures

This paper presents the results of experimental and theoretical/computational micro-wrinkles and buckling on the surfaces of stretchable poly-dimethylsiloxane (PDMS) coated with nano-scale Gold (Au) layers. The wrinkles and buckles are formed by the unloading of pre-stretched PDMS/Au structure after...

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Bibliographic Details
Published in:Journal of applied physics 2015-06, Vol.117 (23)
Main Authors: Oyewole, O. K., Yu, D., Du, J., Asare, J., Oyewole, D. O., Anye, V. C., Fashina, A., Zebaze Kana, M. G., Soboyejo, W. O.
Format: Article
Language:English
Subjects:
Applied physics
ATOMIC FORCE MICROSCOPY
BUCKLING
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
CRACK PROPAGATION
Electronic devices
ELECTRONIC STRUCTURE
EVAPORATION
Fasteners
FINITE ELEMENT METHOD
GOLD
Interfacial cracks
LAYERS
Mathematical models
Microscopy
NANOSTRUCTURES
Polydimethylsiloxane
SCANNING ELECTRON MICROSCOPY
Silicone resins
Wrinkling
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Summary:This paper presents the results of experimental and theoretical/computational micro-wrinkles and buckling on the surfaces of stretchable poly-dimethylsiloxane (PDMS) coated with nano-scale Gold (Au) layers. The wrinkles and buckles are formed by the unloading of pre-stretched PDMS/Au structure after the evaporation of nano-scale Au layers. They are then characterized using atomic force microscopy and scanning electron microscopy. The critical stresses required for wrinkling and buckling are analyzed using analytical models. The possible interfacial cracking that can occur along with film buckling is also studied using finite element simulations of the interfacial crack growth. The implications of the results are discussed for potential applications of micro-wrinkles and micro-buckles in stretchable electronic structures and biomedical devices.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4922665