Lin Dong

Synthesis and characterization of self-assembling (NH4)0.5V2O5 nanowires

Large-scale long (NH4)0.5V2O5 nanowires have been synthesized by rational hydrothermal treatment of ammonium metavanadate at 170 °C. Scanning electron microscope and transmission electron microscope analyses show that the nanowires have diameters of about 20–80 nm, and lengths up to 0.5 mm. Some self-assembled nanobelts are observed with a thickness of 18 nm and width of 100–200 nm. Electrical transport measurements shows that the nanowires are semiconductors with a conductivity of about 10−3 S cm−1 at room temperature. The conduction mechanism can be explained by small polaron hopping in transition metal oxides.

Tantalum disulfide nanobelts: preparation, superconductivity and field emission

A large number of single-crystalline TaS2 nanobelts have been prepared via a two-step method. In this approach, TaS3 nanobelts as precursors were synthesized via chemical vapour transition (CVT), and pyrolysed into TaS2 nanobelts in vacuum. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed that the TaS2 nanobelts have a rectangular section of ~15 × 40 to 80 × 900xa0nm2, and length up to several centimetres. Magnetic measurement indicated that the TaS2 nanobelts have superconductivity at 2.7xa0K, and the superconducting transition temperature (Tc) is higher than that (Tc = 0.8xa0K) reported for the bulk 2H-TaS2. The current density in electron field emission reached about 100xa0µAxa0cm−2 at an applied field of about 27xa0Vxa0µm−1, so the nanobelts could be used as electronic field emitters.