We report the synthesis of one-dimensional(1-D)magnetic Fe_(2)P nanowires and Fe_(2)P@C core@shell nanocables by the reactions of triphenylphosphine(PPh_(3))with Fe powder(particles)and ferrocene(Fe(C_(5)H_(5))_(2)),respectively,in vacuum-sealed ampoules at 380-400℃.The synthesis is based on chemical conversion of micrometer or nanometer sized Fe particles into Fe_(2)P via the extraction of phosphorus from liquid PPh_(3) at elevated temperatures.In order to control product diameters,a convenient sudden-temperature-rise strategy is employed,by means of which diameter-uniform Fe_(2)P@C nanocables are prepared from the molecular precursor Fe(C_(5)H_(5))2.In contrast,this strategy gives no obvious control over the diameters of the Fe_(2)P nanowires obtained using elemental Fe as iron precursor.The formation of 1-D Fe_(2)P nanostructures is ascribed to the cooperative effects of the kinetically induced anisotropic growth and the intrinsically anisotropic nature of hexagonal Fe_(2)P crystals.The resulting Fe_(2)P nanowires and Fe_(2)P@C nanocables display interesting ferromagnetic-paramagnetic transition behaviors with blocking temperatures of 230 and 268 K,respectively,significantly higher than the ferromagnetic transition temperature of bulk Fe_(2)P(TC=217 K).
Junli WangQing YangJun ZhouKewen SunZude ZhangXiaoming FengTanwei Li
Single-crystalline nanoplates of magnesium oxide were successfully synthesized through a calcinations route from the newly produced Mg（OH）2 precursors, which were directly prepared from the commercial bulk magnesium powders under a hydrothermal process in the absence of any additions. Scanning electron microscope （SEM） analysis indicated that the nanoplates were 2-6 μm in average width and about 80 nm in thickness. Transmission electron microscopy （TEM） images revealed that there was large quantity of nanopores with diameters ranging from 5 to 40 nm distributed in these nanoplates. The room-temperature photoluminescence （PL） spectrum of the nanoplates illustrated a strong blue emission band at 416 nm and a weak green emission band at 559 nm. Brunauer-Emmett-Teller （BET） analysis exhibited a feature of high surface of 127.21 m^2/g for the products. The fabrication mechanism of the product was also discussed.
