Effect of Precursor on the Electronic and Geometric Properties of Cobalt Nanoparticles Investigated by Co-K XANES and EXAFS

Journal Article · Fri Feb 02 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2644655· OSTI ID:21054738

Palshin, Vadim; Silva, Rohini M. de; Hormes, Josef; Kumar, SR, Challa S ^[1]

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1. Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, 6980 Jefferson Hwy, Baton Rouge, LA 70806 (United States)

By varying techniques and parameters in wet-chemical synthesis Co-nanoparticles different crystallographic structures (hcp, fcc and epsilon) can be synthesized. Co-K XANES and EXAFS spectra are very powerful tools to distinguish between those structures. In this study we are investigating for the first time the effect of the precursor molecule used for the synthesis on the electronic and geometric properties of cobalt nanoparticles. As precursors two organometallic cobalt complexes were used: alkyne-bridged dicobalthexacarbonyl [(Co2({mu}-HC{identical_to}CH)(CO)6] (ADH) and the well known dicobalt octacarbonyl [Co2(CO)8] (DCO). Both precursors were thermally decomposed under identical reaction conditions. Besides, effect of the precursor on the Co NPs was also investigated when two different types of surfactants are utilized in the reaction, oleic acid and n-trioctylphosphine. When only oleic acid was used as the surfactant, the XAFS analysis showed formation of fcc structure with ADH and hcp with DCO. When a combination of oleic acid and TOP were used, the crystal structure of CO NPs obtained is currently being analyzed.

• OSTI ID: 21054738
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 882; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
CARBON DIOXIDE
CARBON MONOXIDE
COBALT
COBALT COMPLEXES
ELECTRONIC STRUCTURE
FCC LATTICES
FINE STRUCTURE
HCP LATTICES
NANOSTRUCTURES
OLEIC ACID
ORGANOMETALLIC COMPOUNDS
PARTICLE SIZE
PARTICLES
SURFACTANTS
SYNTHESIS
X-RAY SPECTRA
X-RAY SPECTROSCOPY