Identifying hexagonal boron nitride monolayers by transmission electron microscopy

Michael L. Odlyzko, K. Andre Mkhoyan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)558-567
Number of pages10
JournalMicroscopy and Microanalysis
Volume18
Issue number3
DOIs
StatePublished - Jun 1 2012

Keywords

  • ADF
  • BN
  • STEM
  • diffraction
  • multislice
  • tilt

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