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Electric field interference and bimodal particle translocation in nano-integrated multipores

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Abstract

Parallel integration of multiple channels is a fundamental strategy for high-throughput particle detection in solid-state nanopores wherein understanding and control of crosstalk is an important issue for the post resistive pulse analysis. Here we report on a prominent effect of cross-channel electric field interference on the ionic current blockade by nanoparticles in nano-spaced pore arrays in a thin Si3N4 membrane. We systematically investigated the variations in resistive pulse profiles in multipore systems of various inter-channel distances. Although each pore acted independently when they were formed at excessively far distances, we observed significant cross-pore electrostatic interactions under close-integration that led the multipores to virtually act as a single-pore of equivalent area. As a result of the interference, the resistive pulse height demonstrated bimodal distributions due to the pronounced particle trajectory-dependence of the ionic blockade effects. Most importantly, the overcrowded multi-channel structure was found to deliver significant crosstalk with serious degradation of the sensor sensitivity to particle sizes. The present results provide a guide to design multipore structures regarding the trade-off between the detection throughput and sensor sensitivity.

Graphical abstract: Electric field interference and bimodal particle translocation in nano-integrated multipores

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Publication details

The article was received on 25 Oct 2018, accepted on 18 Jan 2019 and first published on 22 Feb 2019


Article type: Communication
DOI: 10.1039/C8NR08632J
Citation: Nanoscale, 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Electric field interference and bimodal particle translocation in nano-integrated multipores

    M. Tsutsui, K. Yokota, T. Nakada, A. Arima, W. Tonomura, M. Taniguchi, T. Washio and T. Kawai, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR08632J

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