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., Kudrynskyi, Z. R., Kovalyuk, Z. D., Allen, C. S., Slater, T. J. A., Kaiser, U., Patanè, A., & 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
• 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