Subnanometer-wide indium selenide nanoribbons

DOI: 10.1021/acsnano.3c00670

Authors: William J. Cull (University of Nottingham) , Stephen T. Skowron (University of Nottingham) , Ruth Hayter (University of Nottingham) , Craig T. Stoppiello (University of Nottingham) , Graham A. Rance (University of Nottingham) , Johannes Biskupek (University of Ulm) , Zakhar R. Kudrynskyi (University of Nottingham) , Zakhar D. Kovalyuk (Institute for Problems of Materials Science, National Academy of Sciences of Ukraine) , Christopher S. Allen (Diamond Light Source) , Thomas J. Slater (Diamond Light Source) , Ute Kaiser (University of Ulm) , Amalia Patanè (University of Nottingham) , Andrei N. Khlobystov (University of Nottingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Nano

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 25251

Abstract: Indium selenides (InxSey) have been shown to retain several desirable properties, such as ferroelectricity, tunable photoluminescence through temperature-controlled phase changes, and high electron mobility when confined to two dimensions (2D). In this work we synthesize single-layer, ultrathin, subnanometer-wide InxSey by templated growth inside single-walled carbon nanotubes (SWCNTs). Despite the complex polymorphism of InxSey we show that the phase of the encapsulated material can be identified through comparison of experimental aberration-corrected transmission electron microscopy (AC-TEM) images and AC-TEM simulations of known structures of InxSey. We show that, by altering synthesis conditions, one of two different stoichiometries of sub-nm InxSey, namely InSe or β-In2Se3, can be prepared. Additionally, in situ AC-TEM heating experiments reveal that encapsulated β-In2Se3 undergoes a phase change to γ-In2Se3 above 400 °C. Further analysis of the encapsulated species is performed using X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), energy dispersive X-ray analysis (EDX), and Raman spectroscopy, corroborating the identities of the encapsulated species. These materials could provide a platform for ultrathin, subnanometer-wide phase-change nanoribbons with applications as nanoelectronic components.

Journal Keywords: III−VI semiconductor; indium selenide; phase change material; nanoribbons; nanowires; carbon nanotubes

Diamond Keywords: Semiconductors

Subject Areas: Materials, Physics

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E02-JEM ARM 300CF

Added On: 15/03/2023 09:09

Documents:
acsnano.3c00670.pdf

Discipline Tags:

Physics Electronics Materials Science Nanoscience/Nanotechnology

Technical Tags:

Microscopy Electron Microscopy (EM) Transmission Electron Microscopy (TEM)