Subnanometer-Wide Indium Selenide Nanoribbons

Cull, William J., Skowron, Stephen T., Hayter, Ruth, Stoppiello, Craig T., Rance, Graham A., Biskupek, Johannes, Kudrynskyi, Zakhar R., Kovalyuk, Zakhar D., Allen, Christopher S., Slater, Thomas J. A. ORCID: https://orcid.org/0000-0003-0372-1551, Kaiser, Ute, Patanè, Amalia and Khlobystov, Andrei N. 2023. Subnanometer-Wide Indium Selenide Nanoribbons. ACS Nano 17 (6) , pp. 6062-6072. 10.1021/acsnano.3c00670

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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.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	1936-0851
Funders:	EPSRC
Date of First Compliant Deposit:	6 April 2023
Date of Acceptance:	9 March 2023
Last Modified:	04 May 2023 01:30
URI:	https://orca.cardiff.ac.uk/id/eprint/158457

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