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Rapid Characterization of Ultrathin Layers of Chalcogenides on SiO 2 /Si Substrates
Author(s) -
Late Dattatray J.,
Liu Bin,
Matte H. S. S. Ramakrishna,
Rao C. N. R.,
Dravid Vinayak P.
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201102913
Subject(s) - materials science , raman spectroscopy , characterization (materials science) , graphene , atomic force microscopy , microscopy , optical microscope , thin film , spectroscopy , nanotechnology , reflection (computer programming) , optoelectronics , thin layers , optics , composite material , scanning electron microscope , physics , quantum mechanics , computer science , programming language
Abstract There has been emerging interest in exploring single‐sheet 2D layered structures other than graphene to explore potentially interesting properties and phenomena. The preparation, isolation and rapid unambiguous characterization of large size ultrathin layers of MoS 2 , GaS, and GaSe deposited onto SiO 2 /Si substrates is reported. Optical color contrast is identified using reflection optical microscopy for layers with various thicknesses. The optical contrast of these thin layers is correlated with atomic force microscopy (AFM) and Raman spectroscopy to determine the exact thickness and to calculate number of the atomic layers present in the thin flakes and sheets. Collectively, optical microscopy, AFM, and Raman spectroscopy combined with Raman imaging data are analyzed to determine the thickness (and thus, the number of unit layers) of the MoS 2 , GaS, and GaSe ultrathin flakes in a fast, non‐destructive, and unambiguous manner. These findings may enable experimental access to and unambiguous determination of layered chalcogenides for scientific exploration and potential technological applications.