Kim, Donghwan Kim, Eunchan Park, Sohyun Kim, Seungah Min, Byoung Koun Yoon, Hyo Jae Kwak, Kyungwon Cho, Minhaeng 2024-01-19T14:31:56Z 2024-01-19T14:31:56Z 2022-01-25 2021-06 2451-9308 https://pubs.kist.re.kr/handle/201004/116886 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. English CELL PRESS Wettability of graphene and interfacial water structure Article 10.1016/j.chempr.2021.03.006 1 CHEM, v.7, no.6, pp.1602 - 1614 CHEM 7 6 1602 1614 N scie scopus 000660002500021 2-s2.0-85104930808 Chemistry, Multidisciplinary Chemistry Article SURFACE ORIENTATION ENERGY TRANSPARENCY SPECTROSCOPY interfacial water structure measurement of water contact angle SDG6: Clean water and sanitation SDG7: Affordable and clean energy SDG9: Industry, innovation, and infrastructure vibrational sum-frequency-generation spectroscopy VSFG WCA wettability of graphene