Nickel–tungsten bimetallic sulfide nanostructures of fullerene type

Bimetallic NiW sulfide nanostructures of the inorganic fullerene-like (IF-like) type were prepared by a chemical method employing ammonium thiotungstate and nickel nitrate as metal-sulfide precursors followed by sulfidation in H_2S/H_2 at 400 °C. The nanostructures were grown with a Ni excess, at an atomic ratio R = 0.85 (R = Ni/Ni + W). The x-ray diffraction patterns showed poorly crystalline WS_2, WO_2, NiS, and Ni_9S_8 phases. High-resolution electron microscopy micrographs revealed the formation of two fullerene-like nanostructures, nickel sulfide nanoparticles and long nanotubes filled with tungsten suboxide, both coated by several WS_2 layers. The surface area of 18 m^2/g measured by nitrogen adsorption (BET surface-area) revealed that these materials contained micropororosity.

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