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Subnanometer-Wide Indium Selenide Nanoribbons.

William J Cull1, Stephen T Skowron1, Ruth Hayter1

  • 1School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.

ACS Nano
|March 14, 2023
PubMed
Summary

Researchers synthesized ultrathin indium selenide (InSe) nanoribbons within carbon nanotubes. These novel materials exhibit controllable phases and could advance nanoelectronic components.

Keywords:
III−VI semiconductorcarbon nanotubesindium selenidenanoribbonsnanowiresphase change material

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Indium selenides (InSe) possess desirable properties like ferroelectricity and high electron mobility in 2D.
  • Controlling the phase and stoichiometry of ultrathin InSe is crucial for its applications.

Purpose of the Study:

  • To synthesize single-layer, subnanometer-wide InSe using templated growth inside single-walled carbon nanotubes (SWCNTs).
  • To identify and control the phase and stoichiometry of the encapsulated InSe materials.
  • To investigate the thermal stability and phase transitions of the synthesized InSe nanoribbons.

Main Methods:

  • Templated synthesis of InSe within SWCNTs.
  • Aberration-corrected transmission electron microscopy (AC-TEM) for structural identification and in situ heating experiments.
  • X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), energy dispersive X-ray analysis (EDX), and Raman spectroscopy for material characterization.

Main Results:

  • Successful synthesis of single-layer, subnanometer-wide InSe (InSe or β-In2Se3) within SWCNTs.
  • Identification of distinct InSe phases (InSe, β-In2Se3, γ-In2Se3) through AC-TEM and simulations.
  • Observation of a phase transition from β-In2Se3 to γ-In2Se3 at temperatures above 400 °C.
  • Confirmation of material composition and phase using XPS, TGA, EDX, and Raman spectroscopy.

Conclusions:

  • Subnanometer InSe can be controllably synthesized and phased within SWCNTs.
  • These ultrathin InSe nanoribbons exhibit temperature-dependent phase changes.
  • The synthesized materials offer a promising platform for novel nanoelectronic components with phase-change capabilities.