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Thin film flexible electrodes based on gold/polytetrafluoroethylene layers

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

McLaughlin, JAD, Hyland, M, McAdams, ET, Holder, D and Zhou, DM (1997) Thin film flexible electrodes based on gold/polytetrafluoroethylene layers. In: PROCEEDINGS OF THE 18TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOL 18, PTS 1-5. IEEE. Vol 18 2 pp. [Conference contribution]

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Abstract

Thin film gold electrodes on flexible Poltetrafluoroethylene (PTFE) substrates are produced for medical implantation, The electrical interface impedance of the electrodes is measured in vitro as a function of surface roughness of the gold as quantified using atomic force microscopy. Alternating current (A.C) impedance measurements show a linear relationship between tile reactive component of the impedance and the surface roughness, Surface features below 42 nm root mean square deviation from the average surface height are shown to result in it reduction in interface impedance and improved impedance matching to a 1% NaCl solution. The surface roughness of the gold is controlled using an electrolytic etch in a NaCl solution allowing the electrical characteristics of the interface to be influenced, Plasma modification of the PTFE substrate is seen to increase the surface energy by changing the chemical nature of tile polymer and lead to enhanced adhesion of the gold layers, Applications of such techniques are expected to improve the current design of physiolgcal signal sensors as well as enhance the reproduabilty of biosensing devices.

Item Type:Conference contribution (Paper)
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:18924
Deposited By:Mrs Ann Blair
Deposited On:19 Jul 2011 08:59
Last Modified:19 Jul 2011 08:59

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