Photoluminescence And Magnetic Properties Of β-ni(oh)_2 Nanoplates And Nio Nanostructures

摘要

Single-crystalline β-nickel hydroxide (β-Ni(OH)_2) nanoplates of hexagonal structure have been synthesized through hydrothermal process. The β-Ni(OH)_2 nanoplates possess well-defined hexagonal shapes with landscape dimension of 45-140 nm and thickness of 20-50 nm. Post-thermal decomposition of the β-Ni(OH)_2 nanoplates led to the formation of single-crystalline NiO nanostructures with landscape dimension of 25-120 nm including nanorolls, nanotroughs and nanoplates. The sizes of the central hole in NiO nanorolls and the low-lying ground in NiO nanotroughs are in the range of 10-24 nm. Two photoluminescence emission peaks appear at 390.5 nm and 467 nm in the photoluminescence spectrum of NiO nanostructures and were assigned to the ~1T_(1g) (G) → ~3A_(2g) and ~1T_(2g) (D) → ~3A_(2g) transitions of Ni~(2+) in oxygen octahedral sites, respectively. Temperature-dependent magnetic measurement results show that an antiferromagnetic-rnparamagnetic transition occur at 26.3 K in β-Ni(OH)_2 nanoplates.