Shape-influenced magnetic properties of CoO nanoparticles
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Using a wet chemical approach, CoO nanospheres, nanorings, nanoflowers, and nanowires of different sizes were generated. Among those, nanorings show ferromagnetic behavior below 6 K while the nanospheres remain paramagnetic. X-ray photoelectron spectroscopy for Co 2p, 3p, and 3s core-levels indicates the paramagnetic high-spin Co(II) electronic configuration. This finding reveals the optical, electronic, and magnetic behavior of CoO nanoparticles (NPs) that opens new opportunities for future applications as catalysts precursors for making pigments, lithium-ion battery materials, or as solid-state sensors as anisotropy source for magnetic recording.
KeywordsMagnetic nanoparticles CoO nanostructures Paramagnetic Ferromagnetic Electronic structures
This research was in part sponsored by the NSF-0506082; the Department of Mechanical Engineering, Texas A&M University; and the Texas Engineering Experiments Station. Supports for TEM and EDS by Dr. Zhiping Luo at the Microscopy Imaging Center (MIC), Texas A&M University were greatly appreciated. This study performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
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