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.; Kaiser, Ute; Patanè, Amalia; Khlobystov, Andrei N.

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.

Citation

Cull, W. J., Skowron, S. T., Hayter, R., Stoppiello, C. T., Rance, G. A., Biskupek, J., …Khlobystov, A. N. (2023). Subnanometer-Wide Indium Selenide Nanoribbons. ACS Nano, 17(6), 6062-6072. https://doi.org/10.1021/acsnano.3c00670

• Journal Article Type: Article
• Acceptance Date: Mar 9, 2023
• Online Publication Date: Mar 14, 2023
• Publication Date: Mar 28, 2023
• Deposit Date: Apr 3, 2023
• Publicly Available Date: Apr 4, 2023
• Journal: ACS Nano
• Print ISSN: 1936-0851
• Electronic ISSN: 1936-086X
• Publisher: American Chemical Society (ACS)
• Peer Reviewed: Peer Reviewed
• Volume: 17
• Issue: 6
• Pages: 6062-6072
• DOI: https://doi.org/10.1021/acsnano.3c00670
• Keywords: III−VI semiconductor, indium selenide, phase change material, nanoribbons, nanowires, carbon nanotubes
• Public URL: https://nottingham-repository.worktribe.com/output/18529257
• Publisher URL: https://pubs.acs.org/doi/10.1021/acsnano.3c00670