Tungsten Oxide Nanowire
Introduction
In recent years, one-dimensional nano material such as nanowire, nanorod, nanotube are becoming popular due to its special properties. Tungsten oxide is a special N type semiconductor material, and also one of the oxide semiconductors which can realize quantum size effect. It shows great property in electrochromism, photochromism, gasochromism and is applied in various fields like chemical sensor, fuel cell and electronic device.
Tungsten oxide has crystalline form of orthogonality, monoclinic, cube and hexagonal. Among which hexagonal tungsten oxide is paid much attention due to its special hexagonal panel, many metal ion can inlaying in it. So as to form hexagonal tungsten bronze MxWO3( M = Li +、Na+、K+). It shows great application prospect in negative electrode materials and Iithium ion rechargeable battery.
Preparation
Use sodium tungstate and hydrochloric acid as raw material, potassium oxalate and potassium sulphate as additive, hexagonal tungsten oxide nanowire can be synthesized by hydrothermal method.
Raw material: Na2WO4•2H2O; hydrochloric acid, potassium oxalate; potassium sulphate; absolute ethyl alcohol, all analytic grade; deionized water.
Preparing method:
(1) Weigh 3.68g Na2WO4•2H2O to dissolve in 20ml deionized water, stir it and adding 3mol HCL until PH=1.
(2) Keep stirring until there is no light yellow anticipation any more, adding in certain amount of K2C2O4 and K2SO4, keep stirring for 30min.
(3) Move the solution to 100ml stainless ste with polytetrafluoroethylene liner, adding deionized water to 3/4 of the reactor, seal and react under 150℃ for 12h.
(4) Cool it down to room temperature, wash it by deionized water and absolute ethyl alcohol, dry under 60℃, tungsten oxide nanowire is obtained.