Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-09-09
Small. Vol. 7, No. 17, 2491--2497 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 5 figures, 1 graphical abstract
Scientific paper
10.1002/smll.201100733
We show that it is possible to deposit, by mechanical exfoliation on SiO2/Si wafers, atomically thin mica flakes down to a single monolayer thickness. The optical contrast of these mica flakes on top of a SiO2/Si substrate, which depends on their thickness, the illumination wavelength and the SiO2 substrate thickness, 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, we show that few-layer graphene flakes can be deposited on top of a previously transferred mica flake. Our transfer method relies on viscoelastic stamps, as those 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.
Agrait Nicolas
Castellanos-Gomez Andres
Rubio-Bollinger Gabino
Tombros Nikolaos
van Wees Bart Jan
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