Low-temperature synthesis and electrical transport properties of W_(18)O_(49) nanowires

摘要

W_(18)O_(49) nanowires are simply synthesized by the reaction between water vapor and tungsten powders in tube furnace at a low temperature of 600 ℃. The nanowires have diameters of 20-50 nm, lengths several micrometers. XRD, TEM and SAED results show that the nanowires are of single crystalline monoclinic W_(18)O_(49) structures with the growth direction [010]. The growth mechanism is analyzed. We investigate the temperature dependence electrical transport properties of individual W_(18)O_(49) nanowires. The conductivity is 2.58 Ω~(-1) cm~(-1) at 290 K and 42.35 Ω~(-1) cm~(-1) at 500 K, respectively. And the electron activation energy is calculated to be about 0.26 eV.