期刊
NANO RESEARCH
卷 8, 期 9, 页码 3020-3026出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0807-x
关键词
graphene; non-contact atomic force microscopy (NC-AFM, KPFM); liquid-solid interface structure; electronic transport in nanoscale materials and structures
类别
资金
- Deutsche Forschungsgemeinschaft [SPP 1459]
- Hans Muhlenhoff-Stiftung
- Ministry of Education and Science of the Russian Federation [K2-2015-033]
- Russian Science Foundation [14-13-00139]
- Russian Science Foundation [14-13-00139] Funding Source: Russian Science Foundation
By the use of non-contact atomic force microscopy (NC-AFM) and Kelvin probe force microscopy (KPFM), we measure the local surface potential of mechanically exfoliated graphene on the prototypical insulating hydrophilic substrate of CaF2(111). Hydration layers confined between the graphene and the CaF2 substrate, resulting from the graphene's preparation under ambient conditions on the hydrophilic substrate surface, are found to electronically modify the graphene as the material's electron density transfers from graphene to the hydration layer. Density functional theory (DFT) calculations predict that the first 2 to 3 water layers adjacent to the graphene hole-dope the graphene by several percent of a unit charge per unit cell.
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