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Optimizing in Vitro Impedance and Physico‐Chemical Properties of Neural Electrodes by Electrophoretic Deposition of Pt Nanoparticles
Author(s) -
Koenen Sven,
Rehbock Christoph,
Heissler Hans E.,
Angelov Svilen D.,
Schwabe Kerstin,
Krauss Joachim K.,
Barcikowski Stephan
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201601180
Subject(s) - electrophoretic deposition , electrode , nanoparticle , electrophoresis , electrical impedance , deposition (geology) , materials science , nanotechnology , chemistry , chemical engineering , analytical chemistry (journal) , chromatography , coating , paleontology , engineering , sediment , electrical engineering , biology
Neural electrodes suffer from an undesired incline in impedance when in permanent contact with human tissue. Nanostructures, induced by electrophoretic deposition (EPD) of ligand‐free laser‐generated nanoparticles (NPs) on the electrodes are known to stabilize impedance in vivo. Hence, Pt surfaces were systematically EPD‐coated with Pt NPs and evaluated for impedance as well as surface coverage, contact angle, electrochemically active surface area (ECSA) and surface oxidation. The aim was to establish a systematic correlation between EPD process parameters and physical surface properties. The findings clearly reveal a linear decrease in impedance with increasing surface coverage, which goes along with a proportional reduction of the contact angle and an increase in ECSA and surface oxidation. EPD process parameters, prone to yield surface coatings with low impedance, are long deposition times (40–60 min), while high colloid concentrations (>250 μg mL −1 ) and electric field strengths (>25 V cm −1 ) should be avoided due to detrimental NP assemblage effects.