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A comprehensive analysis of charge transport in these systems requires a combination of various measurement methods, instruments and electrode designs. Measurements under direct current (DC) typically focus on charge transport without distinguishing between charged species, requiring alternating current (AC) and electrochemical methods to probe additional phenomena. Here, ionic and electronic charge transport mechanisms are separately studied within nanowires on interdigitated micro\u2010electrodes under DC. This study also deconvolutes the effects of humidity, salts and polyethylene glycol (PEG) on protein conductivity. As a model system, the M13 bacteriophage, a filamentous protein assembly that is an ideal scaffold for engineering charge transport is used. The M13 phage is also compared with two previously studied conductive protein fibers,\n                    <jats:italic>Geobacter<\/jats:italic>\n                    \u2010derived protein nanowires (e\u2010PN) and engineered aromatic curli fibers. This study observes both transient ionic charge transport and steady\u2010state electronic conductivity in the M13 phage and curli fibers, whereas e\u2010PN materials predominantly exhibited electronic charge transport. The results show that transient and steady\u2010state examinations of sensitive DC measurements in protein fibers help better understand mixed transport in these materials with particularly low conductivity.\n                  <\/jats:p>","DOI":"10.1002\/adma.202507906","type":"journal-article","created":{"date-parts":[[2025,9,6]],"date-time":"2025-09-06T09:05:54Z","timestamp":1757149554000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Mixed Ionic and Electronic Charge Transport in Conductive Protein Fibers Revealed with DC Electrical Measurements"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3274-4701","authenticated-orcid":false,"given":"Daniel","family":"Modafferi","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering McGill University  3610 University Street Montr\u00e9al QC H3A 0C5 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