Advantages of soft X-ray absorption over TEM-EELS for solid carbon studies - A comparative study on diesel soot with EELS and NEXAFS

A. Braun*, F. E. Huggins, N. Shah, Y. Chen, S. Wirick, S. B. Mun, C. Jacobsen, G. P. Huffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

Diesel soot was investigated with electron energy loss spectroscopy (EELS) and near edge X-ray absorption fine structure spectroscopy (NEXAFS). The EELS spectra were obtained in connection with transmission electron microscopy studies, whereas the NEXAFS were obtained from a scanning transmission X-ray microscope (STXM) and from a conventional NEXAFS beamline at two synchrotron facilities. The X-ray absorption spectra show molecular species, aliphatics, such as carboxyl, and C-H bonds, which are not visible in EELS spectra of the same material. In particular, EELS fails to detect surface-functional groups, which can be detected with NEXAFS. Since numerous works on molecular carbon structure determined with TEM-EELS have been published, it is possible that these results have to be reassessed.

Original languageEnglish (US)
Pages (from-to)117-124
Number of pages8
JournalCarbon
Volume43
Issue number1
DOIs
StatePublished - Jan 1 2005

Keywords

  • A. Soot
  • B. Combustion
  • C. Electron energy loss spectroscopy
  • D. Functional groups

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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