Rapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy
Huttunen, Mikko J.
Norwood, Robert A.
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationRapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy 2017, 8:15714 Nature Communications
RightsOpen Access: This article is licensed under a Creative Commons Attribution 4.0 International License
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AbstractGrain boundaries have a major effect on the physical properties of two-dimensional layered materials. Therefore, it is important to develop simple, fast and sensitive characterization methods to visualize grain boundaries. Conventional Raman and photoluminescence methods have been used for detecting grain boundaries; however, these techniques are better suited for detection of grain boundaries with a large crystal axis rotation between neighbouring grains. Here we show rapid visualization of grain boundaries in chemical vapour deposited monolayer MoS2 samples with multiphoton microscopy. In contrast to Raman and photoluminescence imaging, third-harmonic generation microscopy provides excellent sensitivity and high speed for grain boundary visualization regardless of the degree of crystal axis rotation. We find that the contrast associated with grain boundaries in the third-harmonic imaging is considerably enhanced by the solvents commonly used in the transfer process of two-dimensional materials. Our results demonstrate that multiphoton imaging can be used for fast and sensitive characterization of two-dimensional materials.
VersionFinal published version
SponsorsAcademy of Finland [276376, 284548, 295777, 304666]; TEKES (NP-Nano, OPEC); European Union ; Finnish Cultural Foundation; AFOSR COMAS MURI [FA9550-10-1-0558]; ONR NECom MURI; CIAN NSF ERC [EEC-0812072]; TRIF Photonics from the state of Arizona