One-pot synthesis of PVP-coated Ni0.6Fe2.4O4 nanocrystals |
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Authors: | XianYong Lu Mu Niu ChunHui Yang LuoXin Yi RuiRui Qiao MeiHong Du MingYuan Gao |
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Affiliation: | 1 Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191, China; 3 Beijing Center for Physical and Chemical Analysis, Beijing 100089, China |
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Abstract: | Novel poly(N-vinyl-2-pyrrolidone) (PVP)-coated nickel ferrite nanocrystals were prepared by simultaneously pyrolyzing nickel(II) acetylacetonate (Ni(acac)2) and iron(III) acetylacetonate (Fe(acac)3) in N-vinyl-2-pyrrolidone (NVP). The PVP coating was formed in situ through polymerization of NVP. The crystalline structure of the resultant nickel ferrite was analyzed by high-resolution transmission electron microscopy, electron diffraction patterns, and powder X-ray diffraction. In addition, the valence state of Ni and the metal contents of Ni and Fe in different valence states were analyzed by X-ray photoelectron spectroscopy (XPS), atomic absorption and the phenanthroline method. The surface coating layer of PVP and its binding states were characterized by Fourier transform infrared spectroscopy in combination with XPS. Colloidal stability experiments revealed that the nanocrystals could be dispersed well in both phosphate-buffered saline and Dulbecco’s Modified Eagle Medium. |
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Keywords: | magnetic nanocrystals thermal decomposition N-vinyl-2-pyrrolidone colloidal stability |
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