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Highly Efficient Ionic Photocurrent Generation through WS2 -Based 2D Nanofluidic Channels.

Pan Jia1,2, Qi Wen1, Dan Liu3

  • 1CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 13, 2019
PubMed
Summary

Researchers developed new 2D WS2 nanofluidic membranes for light-driven ion transport. These membranes show significantly enhanced cationic flow and faster photo-responsiveness compared to graphene, enabling new light-controlled nanofluidic devices.

Keywords:
2D layered materialsWS2ion transportlightnanofluidics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Two-dimensional (2D) layered materials offer unique control over transmembrane ion transport in vertical and horizontal directions.
  • Light-driven active transport in synthetic nanofluidic systems is an emerging area of research.

Purpose of the Study:

  • To investigate the photoelectric semiconducting properties of 2D transition metal dichalcogenides for light-driven ion transport.
  • To report the generation of directional and enhanced cationic flow using WS2-based 2D nanofluidic membranes under asymmetric visible light illumination.

Main Methods:

  • Fabrication of WS2-based 2D nanofluidic membranes utilizing their photoelectric semiconducting properties.
  • Asymmetric visible light illumination to induce and measure ionic photocurrent.
  • Characterization of ionic photocurrent magnitude and photo-responsiveness compared to graphene-based materials.

Main Results:

  • Achieved tens of times enhancement in ionic photocurrent magnitude compared to graphene-based materials.
  • Demonstrated 2-3.5 times faster photo-responsiveness in WS2 membranes.
  • Attributed enhancement to the coexistence of semiconducting and metallic WS2 nanosheets and high ionic conductance.

Conclusions:

  • WS2-based 2D nanofluidic membranes enable highly efficient light-driven cationic flow.
  • Developed fundamental elements for light-controlled nanofluidic circuits, including photonic ion switches, diodes, and transistors.
  • Highlighted potential for high-performance light-harvesting nanofluidic systems for artificial photosynthesis and sunlight-driven desalination.