石墨烯
云母
吸附
材料科学
纳米技术
化学工程
原子力显微镜
纳米结构
化学物理
化学
复合材料
有机化学
工程类
作者
Hsien‐Chen Ko,Wei‐Hao Hsu,Chih‐Wen Yang,Chung-Kai Fang,Yi‐Hsien Lu,Ing‐Shouh Hwang
出处
期刊:Langmuir
[American Chemical Society]
日期:2016-06-16
卷期号:32 (43): 11164-11171
被引量:26
标识
DOI:10.1021/acs.langmuir.6b01656
摘要
The contact of water with graphene is of fundamental importance and of great interest for numerous promising applications, but how graphene interacts with water remains unclear. Here we used atomic force microscopy (AFM) to investigate hydrophilic mica substrates with some regions covered by mechanically exfoliated graphene layers in water. In water containing air gas close to the saturation concentration (within ∼40%), cap-shaped nanostructures (or interfacial nanobubbles) and ordered-stripe domains were observed on graphene-covered regions but not on pure mica regions. These structures did not appear on graphene when samples were immersed in highly degassed water, indicating that their formation was caused by the adsorption of gas dissolved in water. Thus, atomically thin graphene, even at a narrow width of 20 nm, changes the local surface chemistry of a highly hydrophilic substrate. Furthermore, surface hydrophobicity significantly affects gas adsorption, which has broad implications for diverse phenomena in water.
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