Rapid Measurement of Nanoparticle Thickness Profiles

Hadas Katz-Boon, Chris J. Rossouw, Christian Dwyer, Joanne Etheridge

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

A method to measure the thickness of a single-crystal nanoparticle in the direction parallel to the incident beam from annular dark field scanning transmission electron microscope (ADF-STEM) images is reported, providing a map of thickness versus position across the nanoparticle-a 'thickness profile' image. The method is rapid and hence suitable for surveying large numbers of nanoparticles. The method measures the intensity scattered to a characterised ADF detector and compares this to the incident beam intensity, to obtain a normalized ADF image. The normalised intensity is then converted to thickness via dynamical ADF image simulations. The method is accurate within 10% and the precision is dominated primarily by 'shot noise'. Merits and limitations of this method are discussed. A method to calibrate the response function of the ADF detector without external equipment is also described, which is applicable to the entire range of gain and background settings.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalUltramicroscopy
Volume124
DOIs
StatePublished - Jan 1 2013
Externally publishedYes

Keywords

  • Annular dark field (ADF) detector Characterisation
  • Gold nanorods
  • Nanoparticles
  • Quantitative ADF-STEM
  • Thickness profile determination

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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