Z contrast of platinum and palladium catalysts

M. M.J. Treacy, A. Howie, C. J. Wilson

Research output: Contribution to journalArticle

120 Scopus citations

Abstract

The usefulness of Crewe's Z-contrast technique for the study of small catalyst particles in the scanning transmission electron microscope is investigated and discussed. By forming suitable combinations of the annular dark-field and energy-loss signals, structural details in platinum particles as small as 2 nm may be imaged, and clusters of image size approaching the probe dimensions (0·5 nm), not visible in the bright-field images, may be detected. In the case of crystalline supports, about 10% of the particles are obscured by strong diffraction contrast in the substrate, although it is found that contrast variations arising from thickness variations in the substrate are suppressed in the energy-loss signal. Particle sizes in the various signals employed are compared.

Original languageEnglish (US)
Pages (from-to)569-585
Number of pages17
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume38
Issue number5
DOIs
StatePublished - Nov 1978
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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