Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 22, Issue 7, Pages 762-769Publisher
SPRINGER
DOI: 10.1007/s12613-015-1132-9
Keywords
nickel sulfide; nanorods; hydrothermal synthesis; optical properties; magnetic measurement
Categories
Funding
- National Science Foundation of China [11305274, 11304407]
- Natural Science Foundation of Chongqing City, China [cstc.2011jja50005]
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Rhombohedral-phase NiS micro/nanorods were synthesized on a large scale through a hydrothermal method using NiCl2 center dot 6H(2)O 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 center dot 6H(2)O and thiourea crystals was fixed at 2:1, and the mixture was heated at 250A degrees C for 5 h. Flower-like NiS nanostructures were formed when the molar ratio between NiCl2 center dot 6H(2)O 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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