Библиографическое описание:Hole-doping of mechanically exfoliated graphene by confined hydration layers / T. R.J. Bollmann [et al.]. - Текст : непосредственный // Nano Res. - 2015. - Vol. 8, Is. 9. - P. 3020-3026. - Cited Reference Count: 42. - Гранты: This work was supported by the SPP 1459 of the Deutsche Forschungsgemeinschaft. We thank O. Ochedowski for help in sample preparation. M. T. gratefully appreciates support from the Hans Muhlenhoff-Stiftung. We are grateful to the "Chebishev" and "Lomonosov" supercomputers of Moscow State University and the Joint Supercomputer Center of the Russian Academy of Sciences for the possibility of using a cluster computer for quantum-chemical calculations. P. B. S. gratefully acknowledges the financial support of the Ministry of Education and Science of the Russian Federation in the framework of the Increase Competitiveness Program of NUST "MISiS" (No. K2-2015-033). L. Y. A. acknowledges the support from the Russian Science Foundation (No. 14-13-00139). - Финансирующая организация: 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]. - SEP. - ISSN 1998-0124. - ISSN 1998-0000, DOI 10.1007/s12274-015-0807-x.
Аннотация: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.
Ключевые слова:graphene, non-contact atomic force microscopy (NC-AFM, KPFM), liquid-solid interface structure, electronic transport in nanoscale materials and structures
Рубрики:ATOMIC-FORCE MICROSCOPY, INITIO MOLECULAR-DYNAMICS, RAMAN-SPECTROSCOPY, AMBIENT CONDITIONS, WATER, MICA, SUBSTRATE
