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 language | English (US) |
---|---|
Pages (from-to) | 117-124 |
Number of pages | 8 |
Journal | Carbon |
Volume | 43 |
Issue number | 1 |
DOIs | |
State | Published - 2005 |
Funding
We are grateful to K.E. Kelly (University of Utah) for providing us with the soot samples. Financial support by the National Science Foundation, Grant # CHE-0891333 is gratefully acknowledged. Data taken using the X-1A STXM developed by the group of J. Kirz and C. Jacobsen at SUNY Stony Brook [16,17] , with support from the Office of Biological and Environmental Research, U.S. DOE under contract DE-FG02-89ER60858, and the NSF under grant DBI-9605045. Zone plates were developed by S. Spector and C. Jacobsen of Stony Brook and D. Tennant of Lucent Technologies Bell Labs [18] , with support from the NSF under grant ECS-9510499. NSLS is operated by the SUNY for the U.S. Dept. of Energy, Contract # DE-AC02-76CH-00016. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences Division, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098 at Lawrence Berkeley National Laboratory.
Keywords
- A. Soot
- B. Combustion
- C. Electron energy loss spectroscopy
- D. Functional groups
ASJC Scopus subject areas
- General Chemistry
- General Materials Science