Novel Synthesis of Magnetic Fe_2P Nanorods from Thermal Decomposition of Continuously Delivered Precursors using a Syringe Pump

摘要

One-dimensional (1D) nanostructured materials, such as nanorods, nanowires, and nanotubes, have received tremendous attention because of their unique properties, which are derived from their low dimensionality and possible quantum confinement effects. These 1D nanostructured materials have found application as the interconnects and functional blocks used in fabricating nanoscale electronic, magnetic, and optical devices. The synthesis of nanostructured magnetic materials is a very important area of research, because of their applications in multi-terabit in-2 magnetic storage devices and in magnetic carriers for drug targeting. So far, there have been several reports on the synthesis of discrete 1D magnetic nanostructured materials; for example the synthesis of iron nanorods through the oriented attachment of monodisperse spherical nanoparticles reported by our research group. Alivisatos and co-workers reported the synthesis of cobalt nanodisks via the thermal decomposition of a cobalt carbonyl precursor. Chaudret and co-workers reported the synthesis of cobalt nanorods and nickel nanorods from the high-temperature reduction of organometallic complexes. Metal phosphides are currently of great scientific interest in materials science and chemistry because of their important magnetic, electronic, and chemical properties. For example, hexagonal iron phosphide and related materials have been intensively studied for their ferromagnetism, magnetoresistance, and magnetocaloric effects. Consequently, it would be very interesting to understand the size- and shape-dependent characteristics of nanostructured metal phosphides. However there have only been a limited number of reports on the synthesis of nanostructured materials containing transition-metal phosphides. Recently, Brock and co-workers synthesized FeP and MnP nanoparticles from the reaction of iron(III) acetylacetonate and manganese carbonyl, respectively, with tris(trimethylsilyl)phosphane at high temperatures. Very recently, Liu and co-workers synthesized antiferromagnetic FeP nanorods via the thermal decomposition of a precursor/surfactant mixture solution.