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https://hdl.handle.net/1822/43912
Título: | Electrochemical characterization of nanostructured Ag:TiN thin films produced by glancing angle deposition on polyurethane substrates for bio-electrode applications |
Autor(es): | Pedrosa, Paulo Machado, Diogo Fiedler, Patrique Vasconcelos, Beatriz Alves, Eduardo Barradas, Nuno P. Martin, Nicolas Haueisen, Jens Vaz, F. Fonseca, Carlos |
Palavras-chave: | Electrochemical impedance spectroscopy Voltammetry TiN Ag-doping Glancing angle deposition Dry electrode |
Data: | 2016 |
Editora: | Elsevier 1 |
Revista: | Journal of Electroanalytical Chemistry |
Citação: | Pedrosa, 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 |
Resumo(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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/43912 |
DOI: | 10.1016/j.jelechem.2016.03.005 |
ISSN: | 1572-6657 |
Versão da editora: | http://www.sciencedirect.com/science/article/pii/S1572665716300947 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - GRF - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S1572665716300947-main.pdf Acesso restrito! | 1,36 MB | Adobe PDF | Ver/Abrir |