Silver Nanofilament Formation Dynamics in a Polymer-Ionic Liquid Thin Film by Direct Write

被引:7
作者
Chao, Zhongmou [1 ]
Sezginel, Kutay B. [1 ]
Xu, Ke [1 ]
Crouch, Garrison M. [3 ]
Gray, Abigale E. [1 ]
Wilmer, Christopher E. [1 ,2 ]
Bohn, Paul W. [3 ,4 ]
Go, David B. [3 ,5 ]
Fullerton-Shirey, Susan K. [1 ,2 ]
机构
[1] Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15261 USA
[2] Univ Pittsburgh, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA
[3] Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
[4] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA
[5] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA
关键词
electric double layer; ionic liquid; neuromorphic computing; polymer electrolyte; silver nanofilament; ELECTRIC DOUBLE-LAYER; POLY(ETHYLENE OXIDE); ELECTROLYTE; GROWTH; FILAMENT;
D O I
10.1002/adfm.201907950
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Silver nanofilament formation dynamics are reported for an ionic liquid (IL)-filled solid polymer electrolyte prepared by a direct-write process using a conductive atomic force microscope (C-AFM). Filaments are electrochemically formed at hundreds of xy locations on a approximate to 40 nm thick polymer electrolyte, polyethylene glycol diacrylate (PEGDA)/[BMIM]PF6. Although the formation time generally decreases with increasing bias from 0.7 to 3.0 V, an unexpected non-monotonic maximum is observed approximate to 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-dependent 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.
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页数:8
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