{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:33:51Z","timestamp":1760150031107,"version":"build-2065373602"},"reference-count":58,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2023,10,8]],"date-time":"2023-10-08T00:00:00Z","timestamp":1696723200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Regional Development Fund (ERDF) through the Operational Programme for Competitiveness and Internationalization","award":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"],"award-info":[{"award-number":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"]}]},{"name":"NanoStim","award":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"],"award-info":[{"award-number":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"]}]},{"name":"NanoID","award":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"],"award-info":[{"award-number":["COMPETE 2020","POCI-01-0247-FEDER-045908","NORTE-01-0247-FEDER-046985"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This study aims to evaluate the lifespan of Ti-Ag dry electrodes prepared using flexible polytetrafluoroethylene (PTFE) substrates. Following previous studies, the electrodes were designed to be integrated into wearables for remote electromyography (EMG) monitoring and electrical stimulation (FES) therapy. Four types of Ti-Ag electrodes were prepared by DC magnetron sputtering, using a pure-Ti target doped with a growing number of Ag pellets. After extensive characterization of their chemical composition and (micro)structural evolution, the Ti-Ag electrodes were immersed in an artificial sweat solution (standard ISO-3160-2) at 37 \u00b0C with constant stirring. Results revealed that all the Ti-Ag electrodes maintained their integrity and functionality for 24 h. Although there was a notable increase in electrical resistivity beyond this timeframe, the acquisition and transmission of (bio)signals remained viable for electrodes with Ag\/Ti ratios below 0.23. However, electrodes with higher Ag content (Ag\/Ti = 0.31) became insulators after 7 days of immersion due to excessive Ag release into the sweat solution. This study concludes that higher Ag\/Ti atomic ratios result in heightened corrosion processes on the electrode\u2019s surface, consequently diminishing their lifespan despite the advantages of incorporating Ag into their composition. This research highlights the critical importance of evaluating electrode longevity, especially in remote biomedical applications like smart wearables, where electrode performance over time is crucial for reliable and sustained monitoring and stimulation.<\/jats:p>","DOI":"10.3390\/s23198321","type":"journal-article","created":{"date-parts":[[2023,10,9]],"date-time":"2023-10-09T06:16:48Z","timestamp":1696832208000},"page":"8321","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Enhancing the Longevity and Functionality of Ti-Ag Dry Electrodes for Remote Biomedical Applications: A Comprehensive Study"],"prefix":"10.3390","volume":"23","author":[{"given":"Daniel","family":"Carvalho","sequence":"first","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5460-4481","authenticated-orcid":false,"given":"Sandra","family":"Marques","sequence":"additional","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7282-4803","authenticated-orcid":false,"given":"Giorgia","family":"Siqueira","sequence":"additional","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5294-0112","authenticated-orcid":false,"given":"Armando","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"},{"name":"LaPMET\u2014Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057 Braga, Portugal"}]},{"given":"Jo\u00e3o","family":"Santos","sequence":"additional","affiliation":[{"name":"Chemistry Centre, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2415-6056","authenticated-orcid":false,"given":"Dulce","family":"Geraldo","sequence":"additional","affiliation":[{"name":"Chemistry Centre, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0732-1774","authenticated-orcid":false,"given":"Cid\u00e1lia R.","family":"Castro","sequence":"additional","affiliation":[{"name":"Institute for Polymers and Composites, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"given":"Ana V.","family":"Machado","sequence":"additional","affiliation":[{"name":"Polymer Engineering Department, Institute for Polymers and Composites, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5506-996X","authenticated-orcid":false,"given":"Filipe","family":"Vaz","sequence":"additional","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"},{"name":"LaPMET\u2014Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8266-0111","authenticated-orcid":false,"given":"Cl\u00e1udia","family":"Lopes","sequence":"additional","affiliation":[{"name":"Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal"},{"name":"LaPMET\u2014Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057 Braga, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"119226","DOI":"10.1016\/j.techfore.2018.02.018","article-title":"E-health and wellbeing monitoring using smart healthcare devices: An empirical investigation","volume":"153","author":"Papa","year":"2020","journal-title":"Technol. 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