NiS with needle-like nanostructure was successfully prepared via a facile and rapid microwave-hydrothermal method.
The as-prepared products were characterized by XRD, XRF, TEM, BET, Raman spectroscopy and TGA-DTA,
respectively. The experimental results showed that NiS was needle-like, and the product possessed a uniform size with
the diameter in a range of 20 nm to 35 nm and the length of about 100-200 nm. The structure belonged to α-NiS crystal
phase. The specific area exceeded 45.0m2/g. Moreover, the possible growth mechanisms were discussed. It was
proposed that with the presence of surfactant of polyethylene glycol-400, the formative micelle in aqueous solution had
acted as templates for the formation of these kinds of α-NiS crystal with the typical morphologies due to the orientated
aggregation effect. Comparing with the conventional hydrothermal method, microwave hydrothermal technique could
not only accelerate the reaction but also make the formed NiS precursors well crystallized.
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