Produção Nacional
Revisado por pares
Low temperature solventless syntheses of nanocrystalline nickel sulfides with different sulfur sources
2015; Elsevier BV; Volume: 87; Linguagem: Inglês
10.1016/j.jpcs.2015.09.005
ISSN1879-2553
AutoresVictor Alexandre Veit Schmachtenberg, Gustavo Tontini, J. Koch, Guilherme Dalla Lana Semione, V. Drago,
Tópico(s)Advanced Thermoelectric Materials and Devices
ResumoThis work describes a novel synthesis for the production of very pure nanocrystalline hexagonal nickel sulfide phase (h-NiS) by the solventless route in air at temperatures of only 190 °C. Only the cubic NiS2 nickel sulfide phase is obtained when the sulfur source reacting with the nickel acetate powder (NiAc) is switched from thiourea (TU) to elemental sulfur (SN). When using both TU and SN sulfur sources, phase mixture of h-NiS, NiS2 and Ni3S4 with less aggregated particles was obtained. Relative concentrations of the phases were quantified by the Rietveld refinement of the XRD powder patterns. The thermal evolution of stoichiometric reagents mixture was observed by TG-FTIR and DSC curves.
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