期刊
NANO LETTERS
卷 16, 期 7, 页码 4447-4453出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01594
关键词
graphene; hydrophilicity; Fermi-level engineering; condensation
类别
资金
- ETH Zurich
- Swiss National Science Foundation [200021_146898/1, 200021_146180/1, 200021_144397/1]
- European Research Council [669908 INTICE]
- Marie Curie Actions for People COFUND program [FEL-14 13-1]
- Swiss National Science Foundation (SNF) [200021_146898, 200021_144397, 200021_146180] Funding Source: Swiss National Science Foundation (SNF)
It is generally accepted that the hydrophilic property of graphene can be affected by the underlying substrate. However, the role of intrinsic vs substrate contributions and the related mechanisms are vividly debated. Here, we show that the intrinsic hydrophilicity of graphene can be intimately connected to the position of its Fermi level, which affects the interaction between graphene and water molecules. The underlying substrate, or dopants, can tune hydrophilicity by modulating the Fermi level of graphene. By shifting the Fermi level of graphene away from its Dirac point, via either chemical or electrical voltage doping, we show enhanced hydrophilicity with experiments and first principle simulations. Increased vapor condensation on graphene, induced by a simple shifting of its Fermi level, exemplifies applications in the area of interfacial transport phenomena.
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