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nickel iii sulfide formula is a binary metal compound with the chemical symbol NiS. It contains nickel (Ni) in the +2 oxidation state and sulfate ions which carry a -2 charge. This type of compound is often found in nature in the form of the mineral heazelwoodite and in industrial applications including nickel refining and lithium battery production. It is a toxic substance and exposure can cause respiratory problems including irritation of the skin, eyes, lungs and nose as well as irritation of the stomach and intestines. It is also a carcinogen and is listed as a hazardous substance in Australia.
A room-temperature synthesis of nickel sulfide nanoparticles capped with oleylamine ligands was carried out following the procedure we have recently developed for the preparation of CuInS2 and CdS nanocrystals [58]. Nickel Xa-C6 was dissolved in toluene and the decomposition induced by adding oleylamine in a NiXa-C6:OLA molar ratio of 1:4 under vigorous stirring. After a few hours the solution turned from green via brown to black, indicating that the nickel sulfide had formed.
Single-crystal X-ray diffraction analysis of both prepared nickel sulfide NPs reveals typical square-planar coordination of the sulfur atoms of both xanthates to the nickel central atom. The oleylamine ligands bind with the nickel atoms through the S-C bond and form a strong, stable cage. This allows for a controlled formation of stoichiometrically pure nickel sulfide thin films and nanoparticles with a defined morphology. Moreover, the oleylamine ligands stabilize the NPs in water and allow for easy dispersal of the nanocrystals into aqueous solutions.