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

fYear

2011

fDate

April 27 2011-May 1 2011

Firstpage

566

Lastpage

569

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Neural Engineering (NER), 2011 5th International IEEE/EMBS Conference on

Conference_Location

Cancun

ISSN

1948-3546

Print_ISBN

978-1-4244-4140-2

Type

conf

DOI

10.1109/NER.2011.5910611

Filename

5910611