Affiliation:
1. State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin 130012, P. R. China
Abstract
Carbon-coated nickel oxide nanoparticles (NiO@C) were synthesized by near-critical hydrothermal method using starch and nickel nitrate as precursors. Also,carbon-coated Ni nanoparticles (Ni@C) were obtained by annealing NiO@C nanoparticles in hydrogen atmosphere. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy(TEM), Raman spectroscopy, simultaneous thermal analysis (STA) and physical property measurement system (PPMS). The average sizes of the NiO and Ni nanoparticles were 18[Formula: see text]nm and 15[Formula: see text]nm according to the XRD analysis, respectively. Raman spectroscopy and thermogravimetric analysis demonstrated that the carbon shells of NiO@C and Ni@C nanoparticles were composed of amorphous and partially graphitized carbon. The formation mechanism of NiO@C and Ni@C nanoparticles was briefly discussed. The Ni@C nanoparticles have enhanced coercive force than bulk nickel, and their coercive force has shown a linear dependence on the square root of temperature.
Publisher
World Scientific Pub Co Pte Lt
Subject
Condensed Matter Physics,General Materials Science
Cited by
4 articles.
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