Modification of electrical properties of graphene by substrate-induced nanomodulation

Jong Kwon Lee, Shiro Yamazaki, Hoyeol Yun, Jinwoo Park, Gary P. Kennedy, Gyu Tae Kim, Oswald Pietzsch, Roland Wiesendanger, Sangwook Lee, Suklyun Hong, Urszula Dettlaff-Weglikowska, Siegmar Roth

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A periodically modulated graphene (PMG) generated by nanopatterned surfaces is reported to profoundly modify the intrinsic electronic properties of graphene. The temperature dependence of the sheet resistivity and gate response measurements clearly show a semiconductor-like behavior. Raman spectroscopy reveals significant shifts of the G and the 2D modes induced by the interaction with the underlying grid-like nanostructure. The influence of the periodic, alternating contact with the substrate surface was studied in terms of strain caused by bending of graphene and doping through chemical interactions with underlying substrate atoms. Electronic structure calculations performed on a model of PMG reveals that it is possible to tune a band gap within 0.14-0.19 eV by considering both the periodic mechanical bending and the surface coordination chemistry. Therefore, the PMG can be regarded as a further step toward band gap engineering of graphene devices.

Original languageEnglish
Pages (from-to)3494-3500
Number of pages7
JournalNano Letters
Volume13
Issue number8
DOIs
Publication statusPublished - 2013 Aug 14

Keywords

  • Graphene
  • bandgap
  • periodic nanomodulation
  • superstructure

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Lee, J. K., Yamazaki, S., Yun, H., Park, J., Kennedy, G. P., Kim, G. T., Pietzsch, O., Wiesendanger, R., Lee, S., Hong, S., Dettlaff-Weglikowska, U., & Roth, S. (2013). Modification of electrical properties of graphene by substrate-induced nanomodulation. Nano Letters, 13(8), 3494-3500. https://doi.org/10.1021/nl400827p