Subnanometer-wide indium selenide nanoribbons
Indium selenides (In<sub><i>x</i></sub>Se<sub><i>y</i></sub>) have been shown to retain several desirable properties, such as ferroelectricity, tunable photoluminescence through temperature-controlled phase changes, and high electron mobility when conf...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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American Chemical Society
2023
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| Subjects: |
| _version_ | 1797110572473384960 |
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| author | Cull, WJ Skowron, ST Hayter, R Stoppiello, CT Rance, GA Biskupek, J Kudrynskyi, ZR Kovalyuk, ZD Allen, CS Slater, TJA Kaiser, U Patanè, A Khlobystov, AN |
| author_facet | Cull, WJ Skowron, ST Hayter, R Stoppiello, CT Rance, GA Biskupek, J Kudrynskyi, ZR Kovalyuk, ZD Allen, CS Slater, TJA Kaiser, U Patanè, A Khlobystov, AN |
| author_sort | Cull, WJ |
| collection | OXFORD |
| description | Indium selenides (In<sub><i>x</i></sub>Se<sub><i>y</i></sub>) 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 In<sub><i>x</i></sub>Se<sub><i>y</i></sub> by templated growth inside single-walled carbon nanotubes (SWCNTs). Despite the complex polymorphism of In<sub><i>x</i></sub>Se<sub><i>y</i></sub> 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 In<sub><i>x</i></sub>Se<sub><i>y</i></sub>. We show that, by altering synthesis conditions, one of two different stoichiometries of sub-nm In<sub><i>x</i></sub>Se<sub><i>y</i></sub>, namely InSe or β-In<sub>2</sub>Se<sub>3</sub>, can be prepared. Additionally, <i>in situ</i> AC-TEM heating experiments reveal that encapsulated β-In<sub>2</sub>Se<sub>3</sub> undergoes a phase change to γ-In<sub>2</sub>Se<sub>3</sub> 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. |
| first_indexed | 2024-03-07T07:56:41Z |
| format | Journal article |
| id | oxford-uuid:df60310c-c7ff-4529-acee-22904650bca5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:56:41Z |
| publishDate | 2023 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:df60310c-c7ff-4529-acee-22904650bca52023-08-17T10:09:15ZSubnanometer-wide indium selenide nanoribbonsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:df60310c-c7ff-4529-acee-22904650bca5Carbon nanotubesTwo dimensional materialsPhase transitionsEncapsulationTransmission electron microscopyEnglishSymplectic ElementsAmerican Chemical Society2023Cull, WJSkowron, STHayter, RStoppiello, CTRance, GABiskupek, JKudrynskyi, ZRKovalyuk, ZDAllen, CSSlater, TJAKaiser, UPatanè, AKhlobystov, ANIndium selenides (In<sub><i>x</i></sub>Se<sub><i>y</i></sub>) 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 In<sub><i>x</i></sub>Se<sub><i>y</i></sub> by templated growth inside single-walled carbon nanotubes (SWCNTs). Despite the complex polymorphism of In<sub><i>x</i></sub>Se<sub><i>y</i></sub> 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 In<sub><i>x</i></sub>Se<sub><i>y</i></sub>. We show that, by altering synthesis conditions, one of two different stoichiometries of sub-nm In<sub><i>x</i></sub>Se<sub><i>y</i></sub>, namely InSe or β-In<sub>2</sub>Se<sub>3</sub>, can be prepared. Additionally, <i>in situ</i> AC-TEM heating experiments reveal that encapsulated β-In<sub>2</sub>Se<sub>3</sub> undergoes a phase change to γ-In<sub>2</sub>Se<sub>3</sub> 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. |
| spellingShingle | Carbon nanotubes Two dimensional materials Phase transitions Encapsulation Transmission electron microscopy Cull, WJ Skowron, ST Hayter, R Stoppiello, CT Rance, GA Biskupek, J Kudrynskyi, ZR Kovalyuk, ZD Allen, CS Slater, TJA Kaiser, U Patanè, A Khlobystov, AN Subnanometer-wide indium selenide nanoribbons |
| title | Subnanometer-wide indium selenide nanoribbons |
| title_full | Subnanometer-wide indium selenide nanoribbons |
| title_fullStr | Subnanometer-wide indium selenide nanoribbons |
| title_full_unstemmed | Subnanometer-wide indium selenide nanoribbons |
| title_short | Subnanometer-wide indium selenide nanoribbons |
| title_sort | subnanometer wide indium selenide nanoribbons |
| topic | Carbon nanotubes Two dimensional materials Phase transitions Encapsulation Transmission electron microscopy |
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