Abstract
Rhombohedral-phase NiS micro/nanorods were synthesized on a large scale through a hydrothermal method using NiCl2·6H2O and thiourea crystals as starting precursors. Recrystallized thiourea was observed to play an important role in the formation of micro/nanosized rods and flower-like structures. The molar ratio and reaction temperature of the precursors influenced the morphology and phase of NiS products. Pure rhombohedral NiS micro/nanorods were obtained on a large scale when the molar ratio between NiCl2·6H2O and thiourea crystals was fixed at 2:1, and the mixture was heated at 250°C for 5 h. Flower-like NiS nanostructures were formed when the molar ratio between NiCl2·6H2O and thiourea crystals was maintained at 1:1. The Raman and Fourier-transform infrared (FTIR) spectra of the as-prepared rhombohedral NiS micro/nanorods were collected, and their magnetic properties were investigated. The results showed that the FTIR absorption peaks of the as-prepared product are located at 634 cm−1 and their Raman peaks are located at 216 and 289 cm−1; the as-prepared NiS micro/nanorods exhibited weak ferromagnetic behavior due to the size effect.
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Yin, Pf., Han, Xy., Zhou, C. et al. Large-scale synthesis of nickel sulfide micro/nanorods via a hydrothermal process. Int J Miner Metall Mater 22, 762–769 (2015). https://doi.org/10.1007/s12613-015-1132-9
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DOI: https://doi.org/10.1007/s12613-015-1132-9