Abstract
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 H2S/H2 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 WS2, WO2, NiS, and Ni9S8 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 WS2 layers. The surface area of 18 m2/g measured by nitrogen adsorption (BET surface-area) revealed that these materials contained micropororosity.
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Olivas, A., Camacho, A., Yacamán, M.J. et al. Nickel–tungsten bimetallic sulfide nanostructures of fullerene type. Journal of Materials Research 19, 2176–2184 (2004). https://doi.org/10.1557/JMR.2004.0284
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DOI: https://doi.org/10.1557/JMR.2004.0284