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Title: Electrochemical Roughening of Thin-Film Platinum for Neural Probe Arrays and Biosensing Applications

Abstract

In this work, we report a method for electrochemical roughening of thin-film platinum (Pt) electrodes that increases active surface area, decreases electrode impedance, increases charge injection capacity, increases sensitivity of biosensors and improves adhesion of electrochemically deposited films. First, a well-established technique for electrochemical roughening of thick Pt electrodes (wires and foils) by oxidation-reduction pulses was modified for use on thin-film Pt. Optimal roughening of thin-film Pt electrodes with this established protocol in a sulfuric acid solution was found to occur at about four times lower frequency than that typically used for thick Pt. This modification in established procedure created a 21x surface area increase but showed nanoscale cracks from inter-grain Pt dissolution that compromised film integrity. A crack free surface with Pt nanocrystal re-deposition (20–30 nm in size) and higher enhancement in surface area (44x) was obtained when the electrolyte was switched to a non-adsorbing perchloric acid solution. These electrochemically roughened electrodes have charge injection limits comparable to titanium nitride and just below carbon nanotube-based materials. Roughened microelectrodes showed a 2.8x increase in sensitivity to hydrogen peroxide detection, indicative of improved enzymatic biosensor performance. Platinum iridium and iridium oxide coatings on these roughened surfaces showed an improvement in adhesion.

Authors:
; ORCiD logo; ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1464289
Alternate Identifier(s):
OSTI ID: 1467810
Report Number(s):
LLNL-JRNL-746398
Journal ID: ISSN 0013-4651; /jes/165/12/G3125.atom
Grant/Contract Number:  
AC52-07NA27344; 16-ERD-035
Resource Type:
Published Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Name: Journal of the Electrochemical Society Journal Volume: 165 Journal Issue: 12; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING; 77 NANOSCIENCE AND NANOTECHNOLOGY; 59 BASIC BIOLOGICAL SCIENCES; Electrochemical roughening; microelectrode; neuromodulation

Citation Formats

Ivanovskaya, Anna N., Belle, Anna M., Yorita, Allison M., Qian, Fang, Chen, Supin, Tooker, Angela, Lozada, Rose García, Dahlquist, Dylan, and Tolosa, Vanessa. Electrochemical Roughening of Thin-Film Platinum for Neural Probe Arrays and Biosensing Applications. United States: N. p., 2018. Web. doi:10.1149/2.0171812jes.
Ivanovskaya, Anna N., Belle, Anna M., Yorita, Allison M., Qian, Fang, Chen, Supin, Tooker, Angela, Lozada, Rose García, Dahlquist, Dylan, & Tolosa, Vanessa. Electrochemical Roughening of Thin-Film Platinum for Neural Probe Arrays and Biosensing Applications. United States. doi:10.1149/2.0171812jes.
Ivanovskaya, Anna N., Belle, Anna M., Yorita, Allison M., Qian, Fang, Chen, Supin, Tooker, Angela, Lozada, Rose García, Dahlquist, Dylan, and Tolosa, Vanessa. Fri . "Electrochemical Roughening of Thin-Film Platinum for Neural Probe Arrays and Biosensing Applications". United States. doi:10.1149/2.0171812jes.
@article{osti_1464289,
title = {Electrochemical Roughening of Thin-Film Platinum for Neural Probe Arrays and Biosensing Applications},
author = {Ivanovskaya, Anna N. and Belle, Anna M. and Yorita, Allison M. and Qian, Fang and Chen, Supin and Tooker, Angela and Lozada, Rose García and Dahlquist, Dylan and Tolosa, Vanessa},
abstractNote = {In this work, we report a method for electrochemical roughening of thin-film platinum (Pt) electrodes that increases active surface area, decreases electrode impedance, increases charge injection capacity, increases sensitivity of biosensors and improves adhesion of electrochemically deposited films. First, a well-established technique for electrochemical roughening of thick Pt electrodes (wires and foils) by oxidation-reduction pulses was modified for use on thin-film Pt. Optimal roughening of thin-film Pt electrodes with this established protocol in a sulfuric acid solution was found to occur at about four times lower frequency than that typically used for thick Pt. This modification in established procedure created a 21x surface area increase but showed nanoscale cracks from inter-grain Pt dissolution that compromised film integrity. A crack free surface with Pt nanocrystal re-deposition (20–30 nm in size) and higher enhancement in surface area (44x) was obtained when the electrolyte was switched to a non-adsorbing perchloric acid solution. These electrochemically roughened electrodes have charge injection limits comparable to titanium nitride and just below carbon nanotube-based materials. Roughened microelectrodes showed a 2.8x increase in sensitivity to hydrogen peroxide detection, indicative of improved enzymatic biosensor performance. Platinum iridium and iridium oxide coatings on these roughened surfaces showed an improvement in adhesion.},
doi = {10.1149/2.0171812jes},
journal = {Journal of the Electrochemical Society},
number = 12,
volume = 165,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1149/2.0171812jes

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