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Chemphyschem. 2017 Jan 25. doi: 10.1002/cphc.201601180. [Epub ahead of print]

Optimizing in Vitro Impedance and Physico-Chemical Properties of Neural Electrodes by Electrophoretic Deposition of Pt Nanoparticles.

Author information

  • 1Technical Chemistry I and, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse 7, 45141, Essen, Germany.
  • 2Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.

Abstract

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.

KEYWORDS:

X-ray photoelectron spectroscopy; cyclic voltammetry; electrophoretic deposition; nanoparticle coating; pulsed laser ablation in liquids

PMID:
28122149
DOI:
10.1002/cphc.201601180
[PubMed - as supplied by publisher]
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