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Title: Synthesis and characterization of FePt nanoparticles and FePt-ZnO nanoparticle composites
Authors: LU MEIHUA
Keywords: FePt; FePt-ZnO; nanoparticle composites; self-assembly; patterned media
Issue Date: 24-Aug-2006
Citation: LU MEIHUA (2006-08-24). Synthesis and characterization of FePt nanoparticles and FePt-ZnO nanoparticle composites. ScholarBank@NUS Repository.
Abstract: 5 nm monodisperse FePt nanoparticles with different compositions were successfully synthesized. These nanoparticles could self-assemble into regular arrays. The as-synthesized FePt nanoparticles were FCC structure and could change to FCT structure after annealing. Some Fe atoms could be segregated from the FePt nanoparticles to form BCC Fe phase during the annealing process. The volume percentage of the BCC Fe phase was calculated based on the hystersis loop, which was consistent with the XRD results.Furthermore, FePt-ZnO nanocomposites were fabricated by growing ZnO nanoparticles in the presence of as-prepared FePt nanoparticles. Two nanocomposites were successfully obtained by varying the initial molar ratio of the FePt and Zn(Ac)2. Both nanocomposites had optical properties similar to that of the pure ZnO nanoparticles. After annealing, all nanoparticle composites could become magnetically hard with different coercivities depending on the volume fraction of ZnO nanoparticles.
Appears in Collections:Master's Theses (Open)

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