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2D WS2 liquid crystals: tunable functionality enabling diverse applications.

Benjamin T Hogan1, Evgeniya Kovalska, Maria O Zhukova

  • 1University of Exeter, North Park Road, Exeter, UKEX4 4QF. bh341@exeter.ac.uk a.baldycheva@exeter.ac.uk.

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|September 5, 2019
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Summary
This summary is machine-generated.

Researchers observed liquid crystalline dispersions of tungsten disulfide (WS2) flakes in organic solvents. These liquid crystals exhibit tunable dichroism, enabling applications in advanced electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Tungsten disulfide (WS2) is a layered material with unique optoelectronic properties.
  • Liquid crystalline phases offer ordered structures for advanced material applications.

Purpose of the Study:

  • To report the first observation of liquid crystalline dispersions of liquid phase-exfoliated WS2 flakes.
  • To investigate the optical properties, specifically birefringence and dichroism, of these WS2 liquid crystals.
  • To explore the magnetic field-induced switching of circular dichroism and its tunability.

Main Methods:

  • Liquid phase exfoliation of WS2.
  • Dispersion of WS2 flakes in organic solvents to form liquid crystals.
  • Optical measurements including linear and circular dichroism.
  • Application of an external magnetic field (±1.5 T) to study switching behavior.

Main Results:

  • Successful formation of liquid crystalline dispersions of WS2 flakes in various organic solvents.
  • Observation of significant linear dichroism across the visible spectrum.
  • Broad-band circular dichroism observed between 500-800 nm.
  • Demonstration of ON/OFF switching of circular dichroism using a magnetic field, with tunable wavelength ranges based on solvent selection.

Conclusions:

  • Liquid crystalline dispersions of WS2 flakes exhibit tunable optical properties.
  • The magnetic field-switchable circular dichroism, combined with WS2's photoluminescence, opens avenues for novel devices.
  • Potential applications include large-area deposition for photovoltaic and terahertz devices.