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Polypyrrole‐coated electrodes show thickness‐dependent stability in different conditions during 42‐day follow‐up in vitro
Author(s) -
Alarautalahti V.,
Hiltunen M.,
Onnela N.,
Nymark S.,
Kellomäki M.,
Hyttinen J.
Publication year - 2018
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.34024
Subject(s) - polypyrrole , electrode , coating , materials science , platinum , biomedical engineering , composite material , degradation (telecommunications) , electrical impedance , chemistry , polymerization , electronic engineering , polymer , electrical engineering , medicine , biochemistry , catalysis , engineering
Electroconductive polypyrrole/dodecylbenzenesulphonate (PPy/DBS) has been proposed as novel electrode coating for biomedical applications. However, as yet, little is known about its long‐term stability in moist conditions. This study compares the stability of PPy/DBS‐coated platinum electrodes that are either dry‐stored, incubated, or both incubated and electrically stimulated. The electrical and material properties of three different coating thicknesses were monitored for 42 days. Initially, the PPy/DBS‐coating decreased the low frequency impedance of the platinum electrodes by 52% to 79%. The dry‐stored electrodes remained stable during the follow‐up, whereas the properties of all the incubated electrodes were altered in three stages with thickness‐dependent duration: stabilization, stable, and degradation. The coated electrodes would be applicable for short‐term, low‐frequency in vitro measurements of up to 14 days without electrical stimulation, and up to 7 days with stimulation. The coating thickness is bound to other coating properties, and should therefore be selected according to the specific target application. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2202–2213, 2018.