Superparamagnetic nanocomposite particles composed of maghemite nanocrystal (ca.15 nm) and deposited Pt nanoclusters (ca. 2.5 nm) were synthesized by a low temperature catalytic method. The magnetic properties of iron oxides species can be easily tuned with different redox atmosphere in the presence of Pt nanoclusters. In this convenient preparation, Pt nanoclusters were first captured on Fe(OH) 3 nanoparticles by electrostatic interaction. Then at 80 °C the Fe(OH) 3 nanoparticles was catalytically reduced with glycol acid to Fe 3 O 4 nanophase which were finally catalytically oxidized to maghemite (γ-Fe 2 O 3 ) nanophase in the air at 80 °C. The as-synthesized Pt/Fe 3 O 4 and Pt/γ-Fe 2 O 3 nanocomposites were well characterized by chemical analysis, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and magnetization measurements. Reversible and efficient transformation between the Pt/Fe 3 O 4 and Pt/γ-Fe 2 O 3 nanocomposites was realized at 80 °C. The Pt/γ-Fe 2 O 3 nanocomposite particles modified with oleic acid were easily dispersed in nonpolar solvents such as hexane, resulting in stable ferrofluids.
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Zhang et al. (2008) studied this question.
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