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Atomically Thin Mica Flakes and Their Application as Ultrathin Insulating Substrates for Graphene

Castellanos-Gomez, A., Wojtaszek, M., Tombros, N., Agrait, N., van Wees, B. J., Rubio-Bollinger, G. & Agraït, N., 5-Sep-2011, In : Small. 7, 17, p. 2491-2497 7 p.

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DOI

  • Andres Castellanos-Gomez
  • Magdalena Wojtaszek
  • Nikolaos Tombros
  • Nicolas Agrait
  • Bart J. van Wees
  • Gabino Rubio-Bollinger
  • Nicolás Agraït

By mechanical exfoliation, it is possible to deposit atomically thin mica flakes down to single-monolayer thickness on SiO(2)/Si wafers. The optical contrast of these mica flakes on top of a SiO(2)/Si substrate depends on their thickness, the illumination wavelength, and the SiO(2) substrate thickness, and can be quantitatively accounted for by a Fresnel-law-based model. The preparation of atomically thin insulating crystalline sheets will enable the fabrication of ultrathin, defect-free insulating substrates, dielectric barriers, or planar electron-tunneling junctions. Additionally, it is shown that few-layer graphene flakes can be deposited on top of a previously transferred mica flake. Our transfer method relies on viscoelastic stamps, as used for soft lithography. A Raman spectroscopy study shows that such an all-dry deposition technique yields cleaner and higher-quality flakes than conventional wet-transfer procedures based on lithographic resists.

Original languageEnglish
Pages (from-to)2491-2497
Number of pages7
JournalSmall
Volume7
Issue number17
Publication statusPublished - 5-Sep-2011

    Keywords

  • FEW-LAYER GRAPHENE, SINGLE-LAYER, FILMS, GRAPHITE, CRYSTALS, SILICON, SHEETS, SIO2

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