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Filaments are electrochemically formed at hundreds of <jats:italic>xy<\/jats:italic> locations on a <jats:bold>\u2248<\/jats:bold>40 nm thick polymer electrolyte, polyethylene glycol diacrylate (PEGDA)\/[BMIM]PF<jats:sub>6<\/jats:sub>. Although the formation time generally decreases with increasing bias from 0.7 to 3.0 V, an unexpected non\u2010monotonic maximum is observed <jats:bold>\u2248<\/jats:bold>2.0 V. At voltages approaching this region of inverted kinetics, IL electric double layers (EDLs) become detectable; thus, the increased nanofilament formation time can be attributed to electric field screening, which hinders silver electromigration and deposition. Scanning electron microscopy confirms that nanofilaments formed in this inverted region have significantly more lateral and diffuse features. Time\u2010dependent formation currents reveal two types of nanofilament growth dynamics: abrupt, where the resistance decreases sharply over as little as a few ms, and gradual where it decreases more slowly over hundreds of ms. Whether the resistance change is abrupt or gradual depends on the extent to which the EDL screens the electric field. Tuning the formation time and growth dynamics using an IL opens the range of accessible resistance states, which is useful for neuromorphic applications.<\/jats:p>","DOI":"10.1002\/adfm.201907950","type":"journal-article","created":{"date-parts":[[2019,11,28]],"date-time":"2019-11-28T07:41:07Z","timestamp":1574926867000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Silver Nanofilament Formation Dynamics in a Polymer\u2010Ionic Liquid Thin Film by Direct Write"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9882-4440","authenticated-orcid":false,"given":"Zhongmou","family":"Chao","sequence":"first","affiliation":[{"name":"Department of Chemical and Petroleum Engineering University of Pittsburgh  Pittsburgh PA 15261 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3060-2945","authenticated-orcid":false,"given":"Kutay 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University of Pittsburgh  Pittsburgh PA 15261 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7440-5727","authenticated-orcid":false,"given":"Christopher E.","family":"Wilmer","sequence":"additional","affiliation":[{"name":"Department of Chemical and Petroleum Engineering University of Pittsburgh  Pittsburgh PA 15261 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9052-0349","authenticated-orcid":false,"given":"Paul W.","family":"Bohn","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering University of Notre Dame  Notre Dame IN 46556 USA"},{"name":"Department of Chemistry and Biochemistry University of Notre Dame  Notre Dame IN 46556 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8948-1442","authenticated-orcid":false,"given":"David 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