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Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes

[Image: see text] MXenes are a growing family of 2D transition-metal carbides and nitrides, which display excellent performance in myriad of applications. Theoretical calculations suggest that manipulation of the MXene surface termination (such as =O or −F) could strongly alter their functional prop...

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Autores principales: Hart, James L., Hantanasirisakul, Kanit, Gogotsi, Yury, Taheri, Mitra L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9585631/
https://www.ncbi.nlm.nih.gov/pubmed/36281254
http://dx.doi.org/10.1021/acsnanoscienceau.2c00024
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author Hart, James L.
Hantanasirisakul, Kanit
Gogotsi, Yury
Taheri, Mitra L.
author_facet Hart, James L.
Hantanasirisakul, Kanit
Gogotsi, Yury
Taheri, Mitra L.
author_sort Hart, James L.
collection PubMed
description [Image: see text] MXenes are a growing family of 2D transition-metal carbides and nitrides, which display excellent performance in myriad of applications. Theoretical calculations suggest that manipulation of the MXene surface termination (such as =O or −F) could strongly alter their functional properties; however, experimental control of the MXene surface termination is still in the developmental stage. Here, we demonstrate that annealing MXenes in an Ar + O(2) low-power plasma results in increased =O functionalization with minimal formation of secondary phases. We apply this method to two MXenes, Ti(2)CT(x) and Mo(2)TiC(2)T(x) (T(x) represents the mixed surface termination), and show that in both cases, the increased =O content increases the electrical resistance and decreases the surface transition-metal’s electron count. For Mo(2)TiC(2)O(x), we show that the O content can be reversibly altered through successive vacuum and plasma annealing. This work provides an effective way to tune MXene surface functionalization, which may unlock exciting surface-dependent properties.
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spelling pubmed-95856312022-10-22 Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes Hart, James L. Hantanasirisakul, Kanit Gogotsi, Yury Taheri, Mitra L. ACS Nanosci Au [Image: see text] MXenes are a growing family of 2D transition-metal carbides and nitrides, which display excellent performance in myriad of applications. Theoretical calculations suggest that manipulation of the MXene surface termination (such as =O or −F) could strongly alter their functional properties; however, experimental control of the MXene surface termination is still in the developmental stage. Here, we demonstrate that annealing MXenes in an Ar + O(2) low-power plasma results in increased =O functionalization with minimal formation of secondary phases. We apply this method to two MXenes, Ti(2)CT(x) and Mo(2)TiC(2)T(x) (T(x) represents the mixed surface termination), and show that in both cases, the increased =O content increases the electrical resistance and decreases the surface transition-metal’s electron count. For Mo(2)TiC(2)O(x), we show that the O content can be reversibly altered through successive vacuum and plasma annealing. This work provides an effective way to tune MXene surface functionalization, which may unlock exciting surface-dependent properties. American Chemical Society 2022-06-28 /pmc/articles/PMC9585631/ /pubmed/36281254 http://dx.doi.org/10.1021/acsnanoscienceau.2c00024 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Hart, James L.
Hantanasirisakul, Kanit
Gogotsi, Yury
Taheri, Mitra L.
Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title_full Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title_fullStr Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title_full_unstemmed Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title_short Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes
title_sort termination-property coupling via reversible oxygen functionalization of mxenes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9585631/
https://www.ncbi.nlm.nih.gov/pubmed/36281254
http://dx.doi.org/10.1021/acsnanoscienceau.2c00024
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