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Stability of Poly(3,4-ethylene dioxythiophene) Materials Intended for Implants
KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
Biomolecular and Organic Electronics, IFM, Linköping University.
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2010 (English)In: Journal of Biomedical Materials Research - Part B Applied Biomaterials, ISSN 1552-4973, Vol. 93B, no 2, 407-415 p.Article in journal (Refereed) Published
Abstract [en]

This study presents experiments designed to study the stability of the conducting polymer poly(3,4-ethylene dioxythiophene) (PEDOT), under simulated physiological conditions using phosphate-buffered saline (PBS) and hydrogen peroxide (H2O2) (0 01M) at 37 degrees C over a 5- to 6-week period Voltage pulsing in PBS was used as an additional test environment The influence of switching the counter ion used in electropolymerization from polystyrene sulphonate (PSS) to heparin was investigated Absorbance spectroscopy and cyclic voltammetry were used to evaluate the material properties Most of the samples in H2O2 lost both electroactivity and optical absorbance within the study period, but PEDOT.PSS was found slightly more stable than PEDOT heparin. Polymers were relatively stable in PBS throughout the study period, with around 80% of electroactivity remaining after 5 weeks, disregarding delamination, which was a significant problem especially for polymer on indium tin oxide substrates Voltage pulsing in PBS did not increase degradation. The counter ion influenced the time course of degradation in Oxidizing agents.

Place, publisher, year, edition, pages
2010. Vol. 93B, no 2, 407-415 p.
Keyword [en]
PEDOT, stability, degradation, conjugated polymers, neural prosthesis
National Category
Medical Laboratory and Measurements Technologies
Identifiers
URN: urn:nbn:se:kth:diva-19399DOI: 10.1002/jbm.b.31597ISI: 000276715800015Scopus ID: 2-s2.0-77951152997OAI: oai:DiVA.org:kth-19399DiVA: diva2:337446
Note

QC 20150729

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2015-07-29Bibliographically approved

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Thaning, Elin M.Asplund, MariaNyberg, Tobiasvon Holst, Hans
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