Nanoscale Friction on Confined Water Layers Intercalated between MoS 2 Flakes and Silica

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Title
Nanoscale Friction on Confined Water Layers Intercalated between MoS 2 Flakes and Silica
Author(s)
Hyunsoo Lee; Hochan Jeong; Joonki Suh; Won Hui Doh; Jaeyoon Baik; Hyun-Joon Shin; Jae-Hyeon Ko; Junqiao Wu; Yong-Hyun Kim; Jeong Young Park
Publication Date
2019-04
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.123, no.14, pp.8827 - 8835
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society. Frictional energy dissipation at the interfaces of two-dimensional (2D) materials through the excitation and transfer processes of kinetic energy into the bulk can be easily influenced by an intercalated water film. An enhancement of friction on water-intercalated graphene has been observed. Is this frictional enhancement by confined water a general phenomenon? We address this issue by investigating the frictional behavior of confined water layers intercalated between single-layer molybdenum disulfide (MoS 2 ), synthesized using chemical vapor deposition, and a silica substrate. The icelike water was intercalated by exposure to high-humidity air. We found that the intercalated water molecules morphologically deform the 2D MoS 2 sheet, forming distinct subdomains after the exposure to high humidity. We found that the adsorption of the icelike water layer between the MoS 2 and the silica leads to friction enhancement, compared with a pristine MoS 2 /silica sample, which is associated with additional phononic friction energy dissipation at the solid-liquid interface, as indicated by the phonon distribution analysis from the empirical force-field calculations. Moreover, the atomic stick-slip behavior shows that the lattice orientation of the hydrophilic MoS 2 affects water molecule diffusion at the interface of the MoS 2 /silica substrate. Chemical mapping of the water-intercalated MoS 2 on silica using scanning photoelectron microscopy and vacuum annealing processes shows water intercalation without changing the intrinsic composition of the MoS 2 on silica
URI
https://pr.ibs.re.kr/handle/8788114/5996
ISSN
1932-7447
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
J. Phys. Chem. C 2019, 123, 8827−8835.pdfDownload

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