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Three dimensionally-ordered 2D MoS

Md Ashraful Islam1, Jung Han Kim, Tae-Jun Ko

  • 1NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA. yeonwoong.jung@ucf.edu.

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|September 14, 2018
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Summary
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Researchers developed flexible, vertically-aligned 2D molybdenum disulfide (2D MoS2) on elastomeric substrates. This novel material shows over 10x improved sensitivity for flexible humidity sensing compared to traditional horizontal layers.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Two-dimensional (2D) transition metal dichalcogenide (2D TMD) layer orientation dictates material properties.
  • Vertically-aligned 2D TMDs offer enhanced adsorption due to exposed edge sites.
  • Integration onto flexible substrates expands application potential for 2D TMDs.

Purpose of the Study:

  • To report a novel form of three-dimensionally ordered, vertically-aligned 2D molybdenum disulfide (2D MoS2) on elastomeric substrates.
  • To explore the tunable multi-functionalities and technological promise of this new material.
  • To demonstrate enhanced performance in flexible electronic applications.

Main Methods:

  • Large-scale (>2 cm2) vertically-aligned 2D MoS2 growth using a 3D patterned silicon dioxide (SiO2) template.
  • Direct transfer and integration onto flexible polydimethylsiloxane (PDMS) substrates leveraging differential water-wettability.
  • Characterization using spectroscopy and microscopy; examination of stretch-driven optical and surface property tunability.

Main Results:

  • Successful fabrication of structurally intact, vertically-aligned 2D MoS2 on flexible PDMS.
  • Demonstrated unique tunability of optical and surface properties upon stretching.
  • Achieved >10 times improved sensitivity in flexible humidity sensing compared to horizontal 2D MoS2.

Conclusions:

  • Vertically-aligned 2D MoS2 integrated on elastomeric substrates represent a promising new material platform.
  • The material exhibits tunable properties and significantly enhanced performance for flexible sensing applications.
  • This work highlights the potential of unconventional flexible technologies utilizing ordered 2D materials.