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18 March 2013 Synthesis and characterization of core@shell (ZnO@γ-Fe2O3) structured nanoparticles with two morphologies
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Proceedings Volume 8626, Oxide-based Materials and Devices IV; 86261G (2013)
Event: SPIE OPTO, 2013, San Francisco, California, United States
Core-shell ZnO/γ-Fe2O3 nanoparticles were prepared via a simple method using forced hydrolysis of acetate metallic salts in a polyol medium. Two types of morphologies can be easily obtained: (i) quasi-spherical ZnO core 20 nm in diameter coated with a continuous shell with 3 nm in length, (ii) rod-like ZnO decorated with γ-Fe2O3 nanoparticles. The ZnO nanorods are 80 nm in diameter and 400 nm in length. The maghemite (γ-Fe2O3) nanoparticles with 5 nm in diameter are strongly bonded to ZnO, well separated from each other and form a monolayer on the surface of ZnO nanorods. In both systems, coating ZnO by γ-Fe2O3 inhibits the surface defects and thus enhances the UV luminescence. The two systems present a superparamagnetic behavior with blocking temperature depending on the morphology: the decorated ZnO nanorods present a blocking temperature around 6 K whereas this temperature is significantly higher (300 K) for spherical core-shell nanoparticles.
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Imen Balti, Laila Samia Smiri, Pierre Rabu, Philippe Léone, Eric Gautron, Bruno Viana, and Noureddine Jouini "Synthesis and characterization of core@shell (ZnO@γ-Fe2O3) structured nanoparticles with two morphologies", Proc. SPIE 8626, Oxide-based Materials and Devices IV, 86261G (18 March 2013);

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