期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 111, 期 5, 页码 1941-1944出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp066871y
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We report the successful synthesis of Co-Au core-shell nanoparticles by reducing an organo-gold compound onto cobalt seeds with a weak reducer in a nonpolar solvent. The core-shell morphology was unequivocally confirmed by complementary structural, magnetic, and optical property measurements. High-resolution transmission electron microscopy and Z-contrast imaging shows a gold shell composed of multiple grains. Electron-energy loss spectroscopy confirms the chemically distinct characteristics of the core (Co) and shell (Au). Temperature-dependent magnetic property measurements confirm that the particles are superparamagnetic with a blocking temperature, T-B similar to 55 K, consistent with a magnetic diameter similar to 6 nm. The UV-visible absorption spectra of these nanoparticles show a red shift (relative to pure gold nanoparticles) in agreement with a Au-shell morphology.
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