Morphology control in synthesis of nickel nanoparticles in the presence of polyvinylpyrrolidone (PVPK30) |
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| Authors: | Dayong Liu Shan Ren Hui Wu Qingtang Zhang Lishi Wen |
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| Affiliation: | (1) The Center for Nanotechnology Research, State Key Laboratory of Optoelectronic Material and Technologies, School of Physical Science and Technology, Sun Yat-Sen University, Guangzhou, 510275, P.R. China |
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| Abstract: | Nickel nanoparticles with different morphologies have been synthesized with polyvinylpyrrolidone (PVPK30) as structure-directing
agent through a chemical reduction process. SEM, TEM and selected-area electron diffraction (SAED) were employed in the analysis
of morphological characteristics of nickel nanoparticles. It was found that nickel nanoparticles are formed by the aggregation
of nanoscale nickel crystallites, and particle morphology was strongly dependent on the PVPK30 concentration. In addition,
crystallite size and formation time of nickel nanoparticles increased with the increasing PVPK30 concentration. PVPK30 additive
seems to influence the three steps of nickel particle precipitation: nucleation, crystal growth and aggregation. The resultant
spherical nickel nanoparticles showed high coercivity. |
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