CUED Publications database

Geometrical Effect in 2D Nanopores

Liu, K and Lihter, M and Sarathy, A and Caneva, S and Qiu, H and Deiana, D and Tileli, V and Alexander, DTL and Hofmann, S and Dumcenco, D and Kis, A and Leburton, J-P and Radenovic, A (2017) Geometrical Effect in 2D Nanopores. Nano Letters, 17. pp. 4223-4230.

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A long-standing problem in the application of solid-state nanopores is the lack of the precise control over the geometry of artificially formed pores compared to the well-defined geometry in their biological counterpart, that is, protein nanopores. To date, experimentally investigated solid-state nanopores have been shown to adopt an approximately circular shape. In this Letter, we investigate the geometrical effect of the nanopore shape on ionic blockage induced by DNA translocation using triangular h-BN nanopores and approximately circular molybdenum disulfide (MoS2) nanopores. We observe a striking geometry-dependent ion scattering effect, which is further corroborated by a modified ionic blockage model. The well-acknowledged ionic blockage model is derived from uniform ion permeability through the 2D nanopore plane and hemisphere like access region in the nanopore vicinity. On the basis of our experimental results, we propose a modified ionic blockage model, which is highly related to the ionic profile caused by geometrical variations. Our findings shed light on the rational design of 2D nanopores and should be applicable to arbitrary nanopore shapes.

Item Type: Article
Uncontrolled Keywords: 2D materials Solid-state nanopores hexagonal boron nitride (h-BN) high-resolution transmission electron microscopy (HRTEM) ion transport molybdenum disulfide (MoS2)
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:55
Last Modified: 13 Apr 2021 09:20
DOI: 10.1021/acs.nanolett.7b01091