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Interference of electrochemical ion diffusion in nanopore sensing.


ABSTRACT: Stable and fast-responding ionic current is a prerequisite for reliable measurements of small objects with a nanopore. Here, we report on the interference of ion diffusion kinetics at liquid-electrode interfaces in nanopore sensing. Using platinum as electrodes, we observed a slow and large decrease in the ionic current through a nanopore in a salt solution suggestive of the considerable influence of the growing impedance at the liquid-metal interfaces via Cottrell diffusion. When detecting nanoparticles, the resistive pulses became weaker following the steady increase in the resistance at the partially polarizable electrodes. The interfacial impedance was also demonstrated to couple with the nanopore chip capacitance thereby degraded the temporal resolution of the ionic current measurements in a time-varying manner. These findings can be useful for choosing the suitable size and material of electrodes for the single-particle and -molecule analyses by ionic current.

SUBMITTER: Leong IW 

PROVIDER: S-EPMC9485904 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Interference of electrochemical ion diffusion in nanopore sensing.

Leong Iat Wai IW   Leong Iat Wai IW   Kishimoto Shohei S   Tsutsui Makusu M   Taniguchi Masateru M  

iScience 20220905 10


Stable and fast-responding ionic current is a prerequisite for reliable measurements of small objects with a nanopore. Here, we report on the interference of ion diffusion kinetics at liquid-electrode interfaces in nanopore sensing. Using platinum as electrodes, we observed a slow and large decrease in the ionic current through a nanopore in a salt solution suggestive of the considerable influence of the growing impedance at the liquid-metal interfaces via Cottrell diffusion. When detecting nano  ...[more]

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