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Direct Observation of Atomic-Scale Gliding on Hydrophilic Surfaces

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Title
Direct Observation of Atomic-Scale Gliding on Hydrophilic Surfaces
Author(s)
Tae Won Go; Hyunsoo Lee; Hyunhwa Lee; Hee Chan Song; Jeong Young Park
Publication Date
2022-07
Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.13, no.29, pp.6612 - 6618
Publisher
AMER CHEMICAL SOC
Abstract
Nanoscale friction behavior on hydrophilic surfaces (HS), influenced by a probe gliding on a confined water layer, has been investigated with friction force microscopy under various relative humidity (RH) conditions. The topographical and frictional responses of the mechanically exfoliated single-layer graphene (SLG) on native-oxide-covered silicon (SiO2/Si) and mica were both influenced by RH conditions. The ordinary phenomena at ambient conditions (i.e., higher friction on a HS than on a SLG due to different hydrophilicity), nondistinguishable height, friction of SLG with SiO2/Si at high RH (> 98%), and the superlubricating behavior of friction on a HS were observed. Furthermore, the subdomain within SLG, consisting of an ice-like water layer intercalated between SLG and SiO2/Si, showed friction enhancement. These results suggest that the abundant water molecules at the interface of the probe and a HS can make a slippery surface that overcomes capillary and viscosity effects through the gliding motion of the probe.
URI
https://pr.ibs.re.kr/handle/8788114/12386
DOI
10.1021/acs.jpclett.2c01895
ISSN
1948-7185
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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