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1 results

  • Identifying Hexagonal Boron Nitride Monolayers by Transmission Electron Microscopy

  • Michael L. Odlyzko, K. Andre Mkhoyan
  • Journal:
    Microscopy and Microanalysis / Volume 18 / Issue 3 / June 2012
    Published online by Cambridge University Press:
    12 April 2012, pp. 558-567
    Print publication:
    June 2012

  • Multislice simulations in the transmission electron microscope (TEM) were used to examine changes in annular-dark-field scanning TEM (ADF-STEM) images, conventional bright-field TEM (BF-CTEM) images, and selected-area electron diffraction (SAED) patterns as atomically thin hexagonal boron nitride (h-BN) samples are tilted up to 500 mrad off of the [0001] zone axis. For monolayer h-BN the contrast of ADF-STEM images and SAED patterns does not change with tilt in this range, while the contrast of BF-CTEM images does change; h-BN multilayer contrast varies strongly with tilt for ADF-STEM imaging, BF-CTEM imaging, and SAED. These results indicate that tilt series analysis in ADF-STEM image mode or SAED mode should permit identification of h-BN monolayers from raw TEM data as well as from quantitative post-processing.