Effect of Iron Content on the Properties of FePt Nanoparticels in Water in Oil Microemulsions
Fe/Pt bimetallic nanoparticles at various molar ratios have been prepared by simultaneous reduction of FeCl2 and H2PtCl6 with hydrazine hydrate in water/Triton X-100/Pentanol microemulsions at room temperature. The size, structure, composition and the magnetic properties of the resultant nanoparticles were characterized by XRD, EDX, TEM, BET and AGM. XRD patterns indicated the formation of face centered cubic FePt nanoparticles with crystallite size in the range of 4 nm to 8 nm. Higher content of iron resulted in larger FePt nanoparticles. EDX analyses on the samples confirmed the presence of Fe and Pt elements in the particle. The composition for each particle was roughly consistent with the Fe2+ to Pt 4+ ratio of initial solution. TEM results showed a narrow size distribution. The physical sizes were similar to the crystallite sizes of FePt nanoparticles calculated from XRD. The Fe/Pt molar ratio of 1 to 1 showed optimum magnetic properties with Hc value of 68.67 Oe and an average surface area of 61.20 m2/g.
microemulsions iron-platinum nanoparticles
Koay Mei Hyie Iskandar Idris Yaacob
Center for Nanotechnology, Precision and Advanced Materials, Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）