In situ analysis of gas composition by electron energy-loss spectroscopy for environmental transmission electron microscopy

Peter Crozier, Santhosh Chenna

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

We have developed methods for using in situ electron energy-loss spectroscopy (EELS) to perform quantitative analysis of gas in an environmental transmission electron microscope. Inner-shell EELS was able to successfully determine the composition of gas mixtures with an accuracy of about 15% or better provided that some precautions are taken during the acquisition to account for the extended gas path lengths associated with the reaction cell. The unique valence-loss spectrum associated with many gases allowed simple methodologies to be developed to determine gas composition from the low-loss region of the spectrum from a gas mixture. The advantage of the valence loss approach is that it allows hydrogen to be detected and quantified. EELS allows real-time analysis of the volume of gas inside the reaction cell and can be performed rapidly with typical acquisition times of a few seconds or less. This in situ gas analysis can also be useful for revealing mass transport issues associated with the differential gas diffusion through the system.

Original languageEnglish (US)
Pages (from-to)177-185
Number of pages9
JournalUltramicroscopy
Volume111
Issue number3
DOIs
StatePublished - Feb 1 2011

Keywords

  • Catalysts
  • EELS
  • Environmental
  • Gas
  • In situ
  • TEM

ASJC Scopus subject areas

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

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