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Energy-Filtered Imaging of Colloidal Cobalt Metal Particles

Published online by Cambridge University Press:  02 July 2020

M.M. Disko ,
J. Popplewell ,
K.O’ Grady  and
J. Hutchings
M.M. Disko
Affiliation:
ExxonMobil Research & Engineering Company, Annandale, New Jersey, 08801
J. Popplewell
Affiliation:
ExxonMobil Research & Engineering Company, Annandale, New Jersey, 08801
K.O’ Grady
Affiliation:
Dept of Physics, The University of York, Heslington, York, YO10 5DD, UK
J. Hutchings
Affiliation:
Dept of Physics, The University of York, Heslington, York, YO10 5DD, UK
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Abstract

Supported transition metal particles are often used as heterogeneous catalysts. Elemental mapping with energy-filtered transmission electron microscopy (EFTEM) offers distinct advantages over conventional TEM and x-ray analysis for these systems. Thickness maps, metal identification, support identification, and direct imaging of oxide layers all represent key new information made possible with EFTEM. Energy-filtered transmission electron microscopy with an omega filter has been used to show Ni, Cu and Cr distributions in an alumina-supported catalyst. in this paper we look at analogous cobalt particles from a colloidal suspension supported on a carbon film.

Energy-filtered TEM maps were obtained using a Gatan Image Filter at 200 kV integrated with an FEI CM200FEG microscope. The colloidal cobalt particles have a nominal diameter of 10 nm, providing an excellent model system when supported on thin amorphous carbon supports. Figures 1 - 3 show cobalt L23, oxygen K and elastic micrographs of partially oxidized cobalt particles (native oxide present after drying).

Type
Characterization of Catalysts (Organized by S. Bradley)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1090 - 1091
Copyright
Copyright © Microscopy Society of America 2001

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References

references

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