Chemical Stabilization of 1T' Phase Transition Metal Dichalcogenides with Giant Optical Kerr Nonlinearity.

Tan, SJR; Abdelwahab, I; Ding, Z; Zhao, X; Yang, T; Loke, GZJ; Lin, H; Verzhbitskiy, I; Poh, SM; Xu, H; Nai, CT; Zhou, W; Eda, G; Jia, B; Loh, KP

Chemical Stabilization of 1T' Phase Transition Metal Dichalcogenides with Giant Optical Kerr Nonlinearity.

Tan, SJR Abdelwahab, I Ding, Z Zhao, X Yang, T

Loke, GZJ Lin, H Verzhbitskiy, I Poh, SM Xu, H Nai, CT Zhou, W Eda, G Jia, B Loh, KP

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Publisher:: American Chemical Society
Publication Type:: Journal Article
Citation:: Journal of the American Chemical Society, 2017, 139, (6), pp. 2504-2511
Issue Date:: 2017-02-15

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Field	Value	Language
dc.contributor.author	Tan, SJR
dc.contributor.author	Abdelwahab, I
dc.contributor.author	Ding, Z
dc.contributor.author	Zhao, X
dc.contributor.author	Yang, T https://orcid.org/0000-0002-8683-2072
dc.contributor.author	Loke, GZJ
dc.contributor.author	Lin, H
dc.contributor.author	Verzhbitskiy, I
dc.contributor.author	Poh, SM
dc.contributor.author	Xu, H
dc.contributor.author	Nai, CT
dc.contributor.author	Zhou, W
dc.contributor.author	Eda, G
dc.contributor.author	Jia, B
dc.contributor.author	Loh, KP
dc.date.accessioned	2022-09-02T05:40:48Z
dc.date.available	2022-09-02T05:40:48Z
dc.date.issued	2017-02-15
dc.identifier.citation	Journal of the American Chemical Society, 2017, 139, (6), pp. 2504-2511
dc.identifier.issn	0002-7863
dc.identifier.issn	1520-5126
dc.identifier.uri	http://hdl.handle.net/10453/161223
dc.description.abstract	The 2H-to-1T' phase transition in transition metal dichalcogenides (TMDs) has been exploited to phase-engineer TMDs for applications in which the metallicity of the 1T' phase is beneficial. However, phase-engineered 1T'-TMDs are metastable; thus, stabilization of the 1T' phase remains an important challenge to overcome before its properties can be exploited. Herein, we performed a systematic study of the 2H-to-1T' phase evolution by lithiation in ultrahigh vacuum. We discovered that by hydrogenating the intercalated Li to form lithium hydride (LiH), unprecedented long-term (>3 months) air stability of the 1T' phase can be achieved. Most importantly, this passivation method has wide applicability for other alkali metals and TMDs. Density functional theory calculations reveal that LiH is a good electron donor and stabilizes the 1T' phase against 2H conversion, aided by the formation of a greatly enhanced interlayer dipole-dipole interaction. Nonlinear optical studies reveal that air-stable 1T'-TMDs exhibit much stronger optical Kerr nonlinearity and higher optical transparency than the 2H phase, which is promising for nonlinear photonic applications.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	American Chemical Society
dc.relation.ispartof	Journal of the American Chemical Society
dc.relation.isbasedon	10.1021/jacs.6b13238
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences
dc.subject.classification	General Chemistry
dc.title	Chemical Stabilization of 1T' Phase Transition Metal Dichalcogenides with Giant Optical Kerr Nonlinearity.
dc.type	Journal Article
utslib.citation.volume	139
utslib.location.activity	United States
utslib.for	03 Chemical Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-09-02T05:40:43Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	139
utslib.citation.issue	6

Abstract:

The 2H-to-1T' phase transition in transition metal dichalcogenides (TMDs) has been exploited to phase-engineer TMDs for applications in which the metallicity of the 1T' phase is beneficial. However, phase-engineered 1T'-TMDs are metastable; thus, stabilization of the 1T' phase remains an important challenge to overcome before its properties can be exploited. Herein, we performed a systematic study of the 2H-to-1T' phase evolution by lithiation in ultrahigh vacuum. We discovered that by hydrogenating the intercalated Li to form lithium hydride (LiH), unprecedented long-term (>3 months) air stability of the 1T' phase can be achieved. Most importantly, this passivation method has wide applicability for other alkali metals and TMDs. Density functional theory calculations reveal that LiH is a good electron donor and stabilizes the 1T' phase against 2H conversion, aided by the formation of a greatly enhanced interlayer dipole-dipole interaction. Nonlinear optical studies reveal that air-stable 1T'-TMDs exhibit much stronger optical Kerr nonlinearity and higher optical transparency than the 2H phase, which is promising for nonlinear photonic applications.

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http://hdl.handle.net/10453/161223