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Alternative methods of identifying the oxidation of metallic nanoparticles embedded in a matrix

✍ Scribed by Feng Wang; Marek Malac; Ray F. Egerton

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
780 KB
Volume
38
Category
Article
ISSN
0968-4328

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✦ Synopsis

We compare methods for valence-state analysis based on energy-loss near-edge structure (ELNES), including the white-line ratio (WLR), pre-edge peak (prepeak) and post-edge peak (postpeak) techniques. Starting from multiple-scattering calculations, we correlate the appearance of a prepeak in the O-K edge and postpeak in the L-edge with oxidation of a transition metal (TM). The ability to use more than one technique is especially advantageous for a nanocomposite of metallic nanoparticles embedded in a matrix, as we show for the case of iron nanoparticles in a silica matrix.

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