Nanoscale friction of CVD single-layer MoS2 with controlled defect formation

Choi, Min Gi; Belianinov, Alex; Pawlicki, Alison; Park, Seonha; Lee, Habeom; Ovchinnikova, Olga S.; Kim, Songkil

doi:10.1016/j.surfin.2021.101437

Nanoscale friction of CVD single-layer MoS₂ with controlled defect formation

Journal Article · Sat Sep 04 00:00:00 EDT 2021 · Surfaces and Interfaces

DOI:https://doi.org/10.1016/j.surfin.2021.101437· OSTI ID:1823324

Choi, Min Gi ^[1]; ^[2]; Pawlicki, Alison ^[3]; Park, Seonha ^[1]; Lee, Habeom ^[1]; ^[4]; ^[1]

Pusan National Univ., Busan (South Korea)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Two-dimensional (2D) layered nanomaterials such as graphene, molybdenum disulfide (MoS₂), or tungsten disulfide offer a promising solution in areas of solid-state lubrication, due to their excellent mechanical properties as well as low friction. However, defects can influence their friction and reduce their superior tribological properties. Thus, it is crucial to understand the effects of defects on sliding behavior in 2D nanomaterials, to foster a functional strategy for utilizing 2D nanomaterials as solid-state tribological films. In this study, frictional effects of defects, grain boundaries, and atomic-scale structural defects were explored on chemical vapor deposition (CVD) grown single layer MoS₂. Selective patterning of defects into MoS₂ was accomplished via controlled irradiation of helium ions with varying ion doses. The friction of MoS₂ was characterized by friction force microscopy (FFM) and was found that friction depends on the defect formation controlled by helium ion irradiation. This approach offers a correlation between surface topography, defects and friction. Understanding the relative friction of MoS₂ in the presence of different levels of defects is foundational to studying tribological properties of a single layer MoS₂ at both nanoscales and macroscales.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Research Foundation (NRF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1823324

Alternate ID(s):: OSTI ID: 1862602

Journal Information:: Surfaces and Interfaces, Journal Name: Surfaces and Interfaces Vol. 26; ISSN 2468-0230

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Controlled defect formation
Friction force microscopy (FFM)
Helium ion beam irradiation
Molybdenum disulfide (MoS2)
Nanoscale friction