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Wettability of graphene and interfacial water structure

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Title
Wettability of graphene and interfacial water structure
Author(s)
Donghwan Kim; Eunchan Kim; Park, Sohyun; Seungah Kim; Min, Byoung Koun; Yoon, Hyo Jae; Kyungwon Kwak; Minhaeng Cho
Subject
SURFACE, ; ORIENTATION, ; ENERGY, ; TRANSPARENCY, ; SPECTROSCOPY
Publication Date
2021-06-10
Journal
CHEM, v.7, no.6, pp.1602 - 1614
Publisher
Elsevier Inc.
Abstract
© 2021 Elsevier Inc.Understanding the wettability of graphene is important for various applications, such as water desalination, energy storage, and catalysis. However, the detailed water hydrogen-bonding structure at the water-graphene interface is not yet fully understood. Using vibrational sum-frequency-generation (VSFG) spectroscopy, we elucidate the water structure at a water-graphene interface. As the number of graphene layers increases, water molecules with dangling OH groups become more populated, indicating the transition from transparency to translucency. We compare the water contact angles on the graphene surfaces with VSFG results, showing an excellent correlation between the water adhesion energy of graphene and the fraction of dangling OH groups estimated from the VSFG spectrum. This observation suggests that the VSFG could be an incisive technique for measuring water's adhesion energy on any spatially confined interface where the water contact angle cannot be measured. We anticipate that the VSFG results will help to elucidate the wettability of low-dimensional materials. Video Abstract:
URI
https://pr.ibs.re.kr/handle/8788114/9902
DOI
10.1016/j.chempr.2021.03.006
ISSN
2451-9294
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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