Polymer-protected monodisperse nickel nanoparticles were synthesized by a modified polyol reduction method in the presence of poly (N-vinyl-2-pyrrolidone). These nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), selected area electron diffraction (SAED), as well as vibrating sample magnetometer (VSM). The experimental results show that the addition of PVP and the concentration of NaOH have strong influences on the size, agglomeration and uniformity of nanoparticles. In the presence of PVP and NaOH with low concentrations, monodisperse nickel nanoparticles with average diameters about 42 nm were obtained and characterized to be pure nickel crystalline with fee structure. Secondary structures such as clusters, loops, and strings resulted from magnetic interactions between particles were observed. The chemical interaction between the PVP and nickel nanoparticles was found by FTIR. The saturation magnetization (Ms), remarem magnetization (Mr) and coercivity (HC) of these nickel nanoparticles are lower than those of balk nickel.
nickel magnetic nanoparticles polyol process PVP
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M P Pileni. The Role of Soft Colloidal Templates in Controlling the Size and Shape of Inorganic Nanocrystals.Nat. Mater., 2003, 2 (3):145–150CrossRefGoogle Scholar
D H Wang, S. Chen, Z H Wu. Synthesis of Nickel Nanoparticles In Water-in-oil Microemulsions.Chem. Mater., 2000, 12(5): 1354–1360CrossRefGoogle Scholar
B S Yin, H S Ma, S Y Wang. Electrochemical Synthesis of Silver Nanoparticles under Protection of Poly (N-vinylpyrrolidone).J. Phys Chem B, 2003, 107(34):8898–8904CrossRefGoogle Scholar
J G Guan, W Wang, R Z Gong. One-step Synthesis of Cobalt Phthalocyanine/iron Nanocomposites with High Susceptibility.Langmuir, 2002, 18(11): 4198–4202CrossRefGoogle Scholar
K Esumi, K Hayakawa T Yoshimura. Morphological Change of Gold-dendrimer Nanocomposites by Laser Irradiation.J. Colloid Interf Sci., 2003, 268(2): 501–506CrossRefGoogle Scholar
Y G Sun, B Mayers, T Herricks, Y N Xia. Polyol Synthesis of Uniform Silver Nanowires: A Plausible Growth Mechanism and the Supporting Evidence.Nano Letters, 2003, 3(7):955–960.CrossRefGoogle Scholar
F Fievet, J P Lagier. Homogeneous and Heterogeneous Nucleations in the Polyol Process for the Preparation of Micron and Submicron Size Metal Particles.Solid State Ionics, 1989, 32/33: 98–205CrossRefGoogle Scholar
M S Hegde, D Laicher. Synthesis and Chemical Reactivity of Polyol Prepared Monodisperse Nickel Powders.Solid State Ionics, 1997, 93(1):33–50CrossRefGoogle Scholar
P Toneguzzo, G Viau, O Acher, F F Vincent, F Fievet. Monodisperse Ferromagnetic Particles for Microwave Applications.Advanced Materials, 1998, 10(13):1032–1034.CrossRefGoogle Scholar
P Li, J G Guan Q J Zhang, Preparation of Nanosized Nickel Powders by Reduction in 1, 2-propanediol.Mater. Sci. and Technol., 2001, 9(3): 259–262Google Scholar
P Li, J C Guan, Q J Zhang. Synthesis and Characterization of Nickel Nanoparticles Protected by Polyvinylpyrrolidone.Journal of Functional Materials, 2005, 36(3): 364–367Google Scholar
V K LaMer, R H, Dinegar. Theory, Production and Mechanism of Formational of Monodispersed Hydrosols.J. Am. Chem. Soc., 1950, 72:4847–4854.CrossRefGoogle Scholar