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.
|Title of host publication||Unknown Host Publication|
|Place of Publication||345 E 47TH ST, NEW YORK, NY 10017 USA|
|Number of pages||2|
|Publication status||Published - 1997|
|Event||PROCEEDINGS OF THE 18TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOL 18, PTS 1-5 - |
Duration: 1 Jan 1997 → …
|Name||PROCEEDINGS OF THE ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY|
|Conference||PROCEEDINGS OF THE 18TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOL 18, PTS 1-5|
|Period||1/01/97 → …|
McLaughlin, JAD., Hyland, M., McAdams, ET., Holder, D., & Zhou, DM. (1997). Thin film flexible electrodes based on gold/polytetrafluoroethylene layers. In Unknown Host Publication (Vol. 18, pp. 108-109). (PROCEEDINGS OF THE ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY). 345 E 47TH ST, NEW YORK, NY 10017 USA: IEEE.