Abstract
Nickel nanoparticle (NiNP) was synthesized by reduction of less toxic nickel acetate tetrahydrate (Ni(CH3CO2)2·4H2O) precursor, using sodium hypophosphite monohydrate (NaPH2O2·H2O) under microwave irradiation. By varying the molar ratio of [Ni+2]/[NaPH2O2]/[NaOH], NiNP of 3.8 to 7.1nm was obtained. Increasing NaOH concentration resulted in morphological change from isolated spherical particles (7.2±1.5nm) to agglomerated nano flowers (72±14nm). Phase analysis and interplanar spacing measurements confirmed the particles as fcc-Ni. Quantitative analysis showed the presence of P and O due to HPO2− radical in reaction product. Addition of small amounts of polyvinylpyrolidone (PVP) or cetyltrimethylammonium bromide (CTAB) resulted in slight increase in particle size.
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