Synthesis of nanocrystalline NiS with different morphologies

Millerite NiS nanocrystals have been prepared through the solvent (hydro-) thermal method. The XRD patterns indicated that the products were pure millerite NiS with cell parameters a = 9.624(4) Angstrom, c = 3.150(1) Angstrom. Using ethylenediamine and hydrazine hydrate as solvent resulted in the formation of rod-like nanocrystalline NiS, whereas spherical nanoparticles were obtained using aqueous ammonia as solvent. The products obtained have relatively high surface areas, which favors the application in catalysis. (C) 2002 Published by Elsevier Science B.V.