石墨烯
润湿
材料科学
接触角
纳米技术
基质(水族馆)
扫描电子显微镜
化学工程
复合材料
海洋学
地质学
工程类
作者
Jincan Zhang,Kaicheng Jia,Yongfeng Huang,Xiaoting Liu,Qiuhao Xu,Wendong Wang,Rui Zhang,Bingyao Liu,Liming Zheng,Heng Chen,Peng Gao,Sheng Meng,Li Lin,Hailin Peng,Zhongfan Liu
标识
DOI:10.1002/adma.202103620
摘要
The wettability of graphene remains controversial owing to its high sensitivity to the surroundings, which is reflected by the wide range of reported water contact angle (WCA). Specifically, the surface contamination and underlying substrate would strongly alter the intrinsic wettability of graphene. Here, the intrinsic wettability of graphene is investigated by measuring WCA on suspended, superclean graphene membrane using environmental scanning electron microscope. An extremely low WCA with an average value ≈30° is observed, confirming the hydrophilic nature of pristine graphene. This high hydrophilicity originates from the charge transfer between graphene and water molecules through H-π interaction. The work provides a deep understanding of the water-graphene interaction and opens up a new way for measuring the surface properties of 2D materials.
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