Synthesis And Application Of One Dimensional WO₃ And MoO₃ Nanomaterials

One-dinmensional (ID) nanomaterials have been significantly attracted attentions due to their unique structure and properties. In this paper, 1D WO3 and MoO3 were synthesized by hydrothermal method. Morphologies and microstructures of as-synthesized products were characterized by XRD, SEM, RAMAN, FTIR. Effect of growth parameters on nanostructures was clarified, growth mechanisms of the nanostructures were discussed.h-WO3 nanowires have been synthesized by hydrothermal method. Any one different experimental parameters can lead to the different structures and morphologies of the final products in this experiment. The electrochemeical performances of the as-synthesized h-WO3 nanowires as anode materials of Li-ion batteries have been investigated. For h-WO3 nanowires electrode, the second diacharge capacity at current density of 0.05 mA/cm2 arrived at 264 mAh/g. After 15th cycles, the discharge capacity can reach a steady state. The mean coulombic efficiency of h-WO3 nanowires electrode during the the charge/discharge test at current density of 0.05 mA/cm2 is more than 90%. The electrochemecial performance of h-WO3 nanowires electrode is the best between 1.0-4.0 V.Ultraviolet (UV) photodetectors were fabricated based on individual WO3 nanowires. Electrical transport measurements show that the as-synthesized h-WO3 nanowires are of n-type semiconductors. The divice characteristics, including spectral response and time response, were studied systematically. It is found that the WO3 nanowires showed the higest light sensitivity at 312 nm. And the photodetectors show high stability and reversibility to 312 nm UV light with an intensity of 2 mW/cm2. The Shottky type (ST) photodetectors and Ohmic type (OT) photodetectors have been investigated. The result shows that the sensitivity and response rate have been improved by shottky contact.α-MoO3 nanoribbons have been synthesized by a simple hydrothermal method. The as-synthesized products were up to 5μm in length,200 nm in width,20 nm in thickness. The influence of hydrothermal temperature, reaction time and PH value on the structure and morphology of the products have been investigated, when the hydrothermal temperature was 80℃, the metastable h-MoO3 microrods were formed firstly. Electrochemical properties ofα-MoO3 nanoribbons electrode were studied. The second diacharge capacity at current density of 0.02 mA/cm2 arrived at 315 mAh/g and there is a plateaus at around 2.0 V, respectively, maintaining 180 mAh/g after 30 cycles. The electrochemecial performance ofα-MoO3 nanoribbons electrode is the best between 1.2-3.8 V.