Title :
Electrochemical stability of poly(ethylene dioxythiophene) electrodes
Author :
Green, Ron ; Chao Duan ; Hassarati, R. ; Goding, J. ; Byrnes-Preston, Phil ; Suaning, G.J. ; Poole-Warren, L. ; Lovell, N.H.
Author_Institution :
Grad. Sch. of Biomed. Eng., Univ. of New South Wales, Sydney, NSW, Australia
fDate :
April 27 2011-May 1 2011
Abstract :
The conducting polymer poly(ethylene dioxythiopene) (PEDOT) has been investigated as a coating for visual prosthesis electrode arrays. The prototype electrode array was coated with PEDOT doped with two conventional anions: paratoluene sulfonate (pTS) and lithium perchlorate (LiClO4). PEDOT variants were analyzed for charge injection limit, electrochemical stability following continuous biphasic stimulation, accelerated ageing and steam sterilization conditions. It was found that PEDOT/LiClO4 was the most stable conducting polymer under chronic stimulation and high temperature circumstances. However, PEDOT/pTS exhibited acceptable stability in comparison to conventional platinum.
Keywords :
bioMEMS; biomedical electrodes; biomedical materials; charge injection; coatings; conducting polymers; electrochemical electrodes; lithium compounds; microelectrodes; neurophysiology; organic compounds; prosthetics; vision defects; LiClO4 doped PEDOT; PEDOT electrode electrochemical stability; accelerated ageing; anion doped PEDOT; charge injection limit; conducting polymer; continuous biphasic stimulation; lithium perchlorate; pTS doped PEDOT; paratoluene sulfonate; poly(ethylene dioxythiophene); steam sterilization conditions; visual prosthesis electrode array coating; Accelerated aging; Electric potential; Electrodes; Polymers; Stability analysis;
Conference_Titel :
Neural Engineering (NER), 2011 5th International IEEE/EMBS Conference on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-4140-2
DOI :
10.1109/NER.2011.5910611
