Dynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2

Handle URI:
http://hdl.handle.net/10754/622708
Title:
Dynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2
Authors:
Ly, Thuc Hue; Zhao, Jiong; Cichocka, Magdalena Ola; Li, Lain-Jong ( 0000-0002-4059-7783 ) ; Lee, Young Hee
Abstract:
Whether and how fracture mechanics needs to be modified for small length scales and in systems of reduced dimensionality remains an open debate. Here, employing in situ transmission electron microscopy, atomic structures and dislocation dynamics in the crack tip zone of a propagating crack in two-dimensional (2D) monolayer MoS2 membrane are observed, and atom-to-atom displacement mapping is obtained. The electron beam is used to initiate the crack; during in situ observation of crack propagation the electron beam effect is minimized. The observed high-frequency emission of dislocations is beyond previous understanding of the fracture of brittle MoS2. Strain analysis reveals dislocation emission to be closely associated with the crack propagation path in nanoscale. The critical crack tip plastic zone size of nearly perfect 2D MoS2 is between 2 and 5 nm, although it can grow to 10 nm under corrosive conditions such as ultraviolet light exposure, showing enhanced dislocation activity via defect generation.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Ly TH, Zhao J, Cichocka MO, Li L-J, Lee YH (2017) Dynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2. Nature Communications 8: 14116. Available: http://dx.doi.org/10.1038/ncomms14116.
Publisher:
Springer Nature
Journal:
Nature Communications
Issue Date:
18-Jan-2017
DOI:
10.1038/ncomms14116
Type:
Article
ISSN:
2041-1723
Sponsors:
This work was supported by the Institute for Basic Science (IBS-R011-D1). We also thank Dr Yu Zhiyang for useful discussions.
Additional Links:
http://www.nature.com/articles/ncomms14116
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLy, Thuc Hueen
dc.contributor.authorZhao, Jiongen
dc.contributor.authorCichocka, Magdalena Olaen
dc.contributor.authorLi, Lain-Jongen
dc.contributor.authorLee, Young Heeen
dc.date.accessioned2017-01-22T10:45:41Z-
dc.date.available2017-01-22T10:45:41Z-
dc.date.issued2017-01-18en
dc.identifier.citationLy TH, Zhao J, Cichocka MO, Li L-J, Lee YH (2017) Dynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2. Nature Communications 8: 14116. Available: http://dx.doi.org/10.1038/ncomms14116.en
dc.identifier.issn2041-1723en
dc.identifier.doi10.1038/ncomms14116en
dc.identifier.urihttp://hdl.handle.net/10754/622708-
dc.description.abstractWhether and how fracture mechanics needs to be modified for small length scales and in systems of reduced dimensionality remains an open debate. Here, employing in situ transmission electron microscopy, atomic structures and dislocation dynamics in the crack tip zone of a propagating crack in two-dimensional (2D) monolayer MoS2 membrane are observed, and atom-to-atom displacement mapping is obtained. The electron beam is used to initiate the crack; during in situ observation of crack propagation the electron beam effect is minimized. The observed high-frequency emission of dislocations is beyond previous understanding of the fracture of brittle MoS2. Strain analysis reveals dislocation emission to be closely associated with the crack propagation path in nanoscale. The critical crack tip plastic zone size of nearly perfect 2D MoS2 is between 2 and 5 nm, although it can grow to 10 nm under corrosive conditions such as ultraviolet light exposure, showing enhanced dislocation activity via defect generation.en
dc.description.sponsorshipThis work was supported by the Institute for Basic Science (IBS-R011-D1). We also thank Dr Yu Zhiyang for useful discussions.en
dc.publisherSpringer Natureen
dc.relation.urlhttp://www.nature.com/articles/ncomms14116en
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleDynamical observations on the crack tip zone and stress corrosion of two-dimensional MoS2en
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalNature Communicationsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionIBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University, Suwon 440-746, Koreaen
dc.contributor.institutionDepartment of Energy Science, Sungkyunkwan University, Suwon 440-746, Koreaen
kaust.authorLi, Lain-Jongen
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