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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Published on: October 31, 2013

Stochastic Ionic Transport in Single Atomic Zero-Dimensional Pores.

Jothi Priyanka Thiruraman, Paul Masih Das, Marija Drndić

|August 14, 2020

Summary

Researchers created single atomic pores in molybdenum disulfide (MoS2) using aberration-corrected scanning transmission electron microscopy (AC-STEM). These 0D pores exhibit ion transport properties similar to biological ion channels, independent of ion concentration and type.

Keywords:

angstrom-size pore atomic pore nanopore sub-nm pore transition metal dichalcogenides two-dimensional material zero-dimensional pore

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Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Two-dimensional (2D) materials like molybdenum disulfide (MoS2) offer unique platforms for nanoscale devices.
Understanding atomic-scale pores is crucial for developing advanced filtration and sensing technologies.
Previous studies predicted strong dependence of transport properties on pore size and configuration.

Purpose of the Study:

To fabricate and characterize single atomic zero-dimensional (0D) pores in monolayer MoS2.
To investigate the transport properties of these atomic pores.
To explore their potential as solid-state analogues of biological ion channels.

Main Methods:

Fabrication of 0D pores using aberration-corrected scanning transmission electron microscopy (AC-STEM).
Atomic-scale characterization of pore structure and configurations (zigzag, armchair, mixed).
Measurement of electrical conductance and current-voltage (I-V) characteristics.

Main Results:

Successfully created 0D pores with 1-5 missing Mo atoms (0.5-1.2 nm size) in monolayer MoS2.
Observed average conductance in the range of 0.6-1 nS, comparable to biological pores.
Transport properties showed independence from bulk molarity (10 mM to 3 M KCl) and cation type (K+, Li+, Mg2+).

Conclusions:

Experimental foundation laid for understanding confinement effects in atomic-scale 2D material pores.
Demonstrated the potential of 0D MoS2 pores as solid-state analogues of biological ion channels.
Opens avenues for novel applications in sensing, filtration, and biomimetic devices.