論文

査読有り
2015年4月

Probing interlayer interactions between graphene and metal substrates by supersonic rare-gas atom scattering

PHYSICAL REVIEW B
  • H. Shichibe
  • ,
  • Y. Satake
  • ,
  • K. Watanabe
  • ,
  • A. Kinjyo
  • ,
  • A. Kunihara
  • ,
  • Y. Yamada
  • ,
  • M. Sasaki
  • ,
  • W. W. Hayes
  • ,
  • J. R. Manson

91
15
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.91.155403
出版者・発行元
AMER PHYSICAL SOC

We demonstrate that highly surface-sensitive supersonic rare-gas (He, Ar, and Xe) atom scattering, in both the quantum and classical regimes, can probe and quantify the interlayer interactions between graphene monolayers and metal substrates in terms of the Debye temperature corresponding to the surface normal vibration, and the surface effective mass. As models of the strongly and weakly interacting graphene, we investigated two systems, graphene on Ru(0001) and Pt(111), respectively. The experimental data for Ar and Xe are compared with the results from theoretical simulations based on the classical smooth surface model. For gr/Pt(111) we find that the scattering pattern of the rare-gas beam, including the Debye-Waller attenuation of the He beam, are quite similar to that from highly oriented pyrolytic graphite (HOPG); this suggests that the graphene-Pt(111) interaction is much like a van der Waals interaction. On the contrary, for the gr/Ru(0001) system, we find a smaller Debye-Waller attenuation and a larger surface effective mass, indicating that graphene on Ru(0001) is tightly bonded to the substrate. Furthermore, asymmetrical spectral shapes in the Ar and Xe scattering spectra from gr/Ru(0001) are interpreted as a result of the lateral distribution of the interlayer interaction corresponding to the moire pattern. It is found that the "valley" region of the moire pattern has high effective mass reflecting stronger bonding to the substrate, contributing to the high reflectivity of the He beam reported for this system. On the other hand, the effective mass of the "hill" region is found to be similar to that of HOPG, indicating that this region is well decoupled from the substrate. These results demonstrate a unique capability of atom scattering to probe and evaluate the molecule-substrate interaction and its spatial distributions.

Web of Science ® 被引用回数 : 20

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.91.155403
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000352188700005&DestApp=WOS_CPL

エクスポート
BibTeX RIS