Hexagonal close-packed (hcp) cobalt nanowires with diameters of 150-300 nm and lengths of up to several hundreds of micrometers have been synthesized by a hydrothermal reduction method. These cobalt nanowires were generated by the reduction of cobalt(II) citrate complexes by hypophosphite (H 2 PO 2 -) in basic solution at 160°C. High-resolution TEM and SAED reveal that the as-prepared Co nanowires

A Hydrothermal Reduction Route to Single-Crystalline Hexagonal Cobalt Nanowires. -The title nanowires with diameters of 150-300 nm and lengths of up to several hundreds of micrometers are hydrothermally synthesized in high yield from mixtures of sodium citrate, CoCl2, NaH2PO2, NaOH, and H2O (autoclave, 160°C, 20 h). The samples are characterized by XRD, SEM, TEM, HRTEM, EDS, and FT-IR spectroscopy. The as-prepared Co nanowires show ferromagnetism with a greater coercitivity than the bulk materials. -(XIE, B.-Q.; QIAN*, Y.; ZHANG, S.; FU, S.; YU, W.; Eur.