Ion current rectification in funnel-shaped nanochannels: Hysteresis and inversion effects

Leon Rosentsvit, Wei Wang, Jarrod Schiffbauer, Hsueh Chia Chang, Gilad Yossifon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Ion current rectification inversion is observed in a funnel-shaped nanochannel above a threshold voltage roughly corresponding to the under-limiting to over-limiting current transition. Previous experimental studies have examined rectification at either low-voltages (under-limiting current region) for conical nanopores/funnel-shaped nanochannels or at high-voltages (over-limiting region) for straight nanochannels with asymmetric entrances or asymmetric interfacing microchannels. The observed rectification inversion occurs because the system resistance is shifted, beyond a threshold voltage, from being controlled by intra-channel ion concentration-polarization to that controlled by external concentration-polarization. Additionally, strong hysteresis effects, due to residual concentration-polarization, manifest themselves through the dependence of the transient current rectification on voltage scan rate.

Original languageEnglish
Article number224706
JournalJournal of Chemical Physics
Volume143
Issue number22
DOIs
StatePublished - 14 Dec 2015
Externally publishedYes

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