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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

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Light-Controlled Ionic Transport through Molybdenum Disulfide Membranes.

Yuyu Su¹, Dan Liu¹, Guoliang Yang¹

¹Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong 3220, Victoria, Australia.

ACS Applied Materials & Interfaces

|July 15, 2021

Summary

Molybdenum disulfide (MoS2) membranes show light-controlled ion transport for smart nanofluidics. Their ionic conductivity significantly increases under light, enabling reversible switching for potential applications.

Keywords:

2D membranes MoS2 membranes ionic transport light control nanoconfined channels surface charge

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Two-dimensional (2D) nanomaterials offer unique nanochannels for nanofluidics.
Smart nanofluidic devices leverage intrinsic material properties for advanced control.
Molybdenum disulfide (MoS2) is a promising 2D material with tunable electronic properties.

Purpose of the Study:

To investigate MoS2 membranes for light-controlled nanofluidic applications.
To explore the photoelectrical properties of MoS2 in ionic transport.
To demonstrate reversible and stable light-induced switching of ionic current.

Main Methods:

Fabrication of MoS2 membranes.
Ionic transport measurements in NaCl and KCl solutions under varying light conditions (405 nm and 635 nm).
Analysis of ionic conductivity dependence on light intensity and concentration.

Main Results:

MoS2 membranes exhibit surface charge-governed ionic transport without light.
Ionic conductivity is significantly enhanced (up to 2 orders of magnitude) in low concentration solutions compared to bulk.
Light illumination at 405 nm and 635 nm reversibly enhances ionic conductivity, with current increasing proportionally to light intensity.

Conclusions:

MoS2 membranes possess photoelectrical properties suitable for light-controlled nanofluidics.
The observed reversible light switching of ionic current demonstrates potential for advanced nanofluidic devices.
MoS2 membranes represent a promising platform for developing smart nanofluidic applications.