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"Amorphous Nickel Sulfide" Is Hydrated Nanocrystalline NiS with a Core-Shell Structure

Lookup NU author(s): Dr Elisa Lopez-CapelORCiD, Professor David ManningORCiD

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Abstract

The application of a range of experimental techniques shows that "amorphous nickel sulfide" (the material precipitated from aqueous solutions of Ni-II salts and SII- under ambient conditions) is actually a hydrated nanoparticulate material with an approximate formula NiS center dot 1.5H(2)O. The particles comprise a crystalline, anhydrous core (diameter ca. 1-3 nm) with the millerite (NiS) structure, surrounded by a hydrated shell phase. The materials prepared under acidic conditions (pH = 3 and 5) transform with age to form polydymite (Ni3S4) and heazlewoodite (Ni3S2), while materials prepared at pH = 7 and 9 do not undergo this transformation. At pH = 12, the preparation procedure yields NiAs-type NiS as a metastable phase.

Publication metadata

Author(s): Huang SS, Harris KDM, Lopez-Capel E, Manning DAC, Rickard D

Publication type: Article

Publication status: Published

Journal: Inorganic Chemistry

Year: 2009

Volume: 48

Issue: 24

Pages: 11486-11488

ISSN (print): 0020-1669

ISSN (electronic): 1520-510X

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/ic901512z

DOI: 10.1021/ic901512z

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