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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Characterization of superpararnagnetic "core-shell" nanoparticles and monitoring their anisotropic phase transition to ferromagnetic "solid solution" nanoalloyse

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Title
Characterization of superpararnagnetic "core-shell" nanoparticles and monitoring their anisotropic phase transition to ferromagnetic "solid solution" nanoalloyse
Other Titles
Characterization of superpararnagnetic "core-shell" nanoparticles and monitoring their anisotropic phase transition to ferromagnetic "solid solution" nanoalloyse
Author
Park, JIKim, MGJun, YWLee, Jae SungLee, WRCheon, J
Keywords
ABSORPTION FINE-STRUCTURE; BIMETALLIC CLUSTERS; STRUCTURAL-ANALYSIS; NANOCRYSTAL SUPERLATTICES; MAGNETIC NANOPARTICLES; STRUCTURE SPECTROSCOPY; CATALYSTS; EXAFS; PRECURSORS; CORE/SHELL
Issue Date
2004-07
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.126, no.29, pp.9072 - 9078
Abstract
The structure, magnetism, and phase transition of core-shell type CoPt nanoparticles en route to solid solution alloy nanostructures are systematically investigated. The characterization of Co(core)Pt(shell) nanoparticles obtained by a "redox transmetalation" process by transmission electron microscopy (TEM) and, in particular, X-ray absorption spectroscopy (XAS) provides clear evidence for the existence of a core-shell type bimetallic interfacial structure. Nanoscale phase transitions of the Co(core)Pt(shell) structures toward c-axis compressed face-centered tetragonal (fct) solid solution alloy CoPt nanoparticles are monitored at various stages of a thermally induced annealing process and the obtained fct nanoalloys show a large enhancement of their magnetic properties with ferromagnetism. The relationship between the nanostructures and their magnetic properties is in part elucidated through the use of XAS as a critical analytical tool
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DOI
10.1021/ja049649k
ISSN
0002-7863
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ECHE_Journal Papers
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