Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/43912

TitleElectrochemical characterization of nanostructured Ag:TiN thin films produced by glancing angle deposition on polyurethane substrates for bio-electrode applications
Author(s)Pedrosa, Paulo
Machado, Diogo
Fiedler, Patrique
Vasconcelos, Beatriz
Alves, Eduardo
Barradas, Nuno P.
Martin, Nicolas
Haueisen, Jens
Vaz, F.
Fonseca, Carlos
KeywordsElectrochemical impedance spectroscopy
Voltammetry
TiN
Ag-doping
Glancing angle deposition
Dry electrode
Issue date2016
PublisherElsevier
JournalJournal of Electroanalytical Chemistry
CitationPedrosa, P., Machado, D., Fiedler, P., Vasconcelos, B., Alves, E., Barradas, N. P., . . . Fonseca, C. (2016). Electrochemical characterization of nanostructured Ag:TiN thin films produced by glancing angle deposition on polyurethane substrates for bio-electrode applications. Journal of Electroanalytical Chemistry, 768, 110-120. doi: 10.1016/j.jelechem.2016.03.005
Abstract(s)Flexible polyurethane substrates were coated with Ag:TiN thin films (N/Ti atomic ratio = 0.7; 10 at.% Ag), with different column inclinations (α = 0°, 40° and 80°) and architectures (columnar, zigzag with 2 and 4 periods), using the Glancing Angle Deposition (GLAD) technique. The coatings were characterized in order to assess the best thin film architecture to suit the bio-potential electrode applications. An abrupt increase of porosity of the samples was perceivable with increasing α angles (particularly from 40° to 80°). Hence, the sputtered films could be divided into dense (Ag:TiN 0° and Ag:TiN 40°) and porous (Ag:TiN 80°, Ag:TiN 80° 2Z and Ag:TiN 80° 4Z) samples. The electrochemical behaviour of the sampleswas consistently linked to the porosity differences,which was accompanied by an increase of the surface Ag content. Furthermore, the porous samples exhibited lower impedances (~104 Ωcm2 at 2 MHz), as well as electrochemical noise and drift rate values similar to those of the commercial Ag/AgCl electrodes. Hence, the porous Ag:TiN 80°, Ag:TiN 80° 2Z and Ag:TiN 80° 4Z porous Ag:TiN GLAD coatings seem to be the most promising architectures for the envisaged bio-potential electrode applications.
TypeArticle
URIhttp://hdl.handle.net/1822/43912
DOI10.1016/j.jelechem.2016.03.005
ISSN1572-6657
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S1572665716300947
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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