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Amorphous carbon interlayers for gold on elastomer stretchable conductors

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Manzoor, MU, Tuinea-Bobe, CL, McKavanagh, F, Byrne, CP, Dixon, D, Maguire, PD and Lemoine, P (2011) Amorphous carbon interlayers for gold on elastomer stretchable conductors. Journal of Phys D, Applied Physics , 44 (24). 245301-9pp. [Journal article]

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URL: http://iopscience.iop.org/0022-3727/44/24/245301/pdf/0022-3727_44_24_245301.pdf

DOI: doi:10.1088/0022-3727/44/24/245301

Abstract

Gold on polydimethylsiloxane (PDMS) stretchable conductors were prepared using a novelapproach by interlacing an hydrogenated amorphous carbon (a-C :H) layer between thedeposited metal layer and the elastomer. AFM analysis of the a-C :H film surface before gold deposition shows nanoscale buckling, the corresponding increase in specific surface area corresponds to a strain compensation for the first 4–6% of bi-axial tensile loading. Without this interlayer, the deposited gold films show much smaller and uni-directional ripples as well as more cracks and delaminations. With a-C :H interlayer, the initial electrical resistivity of the metal film decreases markedly (280-fold decrease to 8 × 10−6cm). This is not due to conduction within the carbon interlayer; both a-C :H/PDMS and PDMS substrates are electrically insulating. Upon cyclic tensile loading, both films become more resistive, but return to their initial state after 20 tensile cycles up to 60% strain. Profiling experiments using secondary ion mass spectroscopy and x-ray photoelectron spectroscopy indicate that the a-C :H layer intermixes with the PDMS, resulting in a graded layer of decreasing stiffness. We believe that both this graded layer and the surface buckling contribute to the observed improvement in the electrical performance of these stretchable conductors.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:19976
Deposited By:Dr Patrick Lemoine
Deposited On:13 Sep 2011 15:14
Last Modified:03 Jan 2012 11:01

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