Nano particle size tungsten trioxide may be applied for the production of thermal insulation paper. Such “paper” is widely used in automobile silencers for noise elimination and heat insulation, heat-insulation materials for exhaust pipes, and isolation and anti-sintering materials. Moreover, tungsten trioxide nanopowder has photocatalytic properties so that it has been used for water pollution treatment and photolysis of water to produce hydrogen. Therefore, it is necessary to study tungsten trioxide nanomaterials to better understand the heat insulation material.
Microtopography of Hexagonal Phase Tungsten Trioxide Ultrathin Nanosheet
To further study the microstructure of hexagonal phase tungsten trioxide ultrathin nanosheet, TEM characterization was carried out. The results are shown in the image below, in which (a) is a TEM image, (b) is a HRTEM image.
It can be seen from the image (a) that the synthesized hexagonal phase tungsten trioxide ultrathin nanosheet has an average size of 20nm~120nm and a thickness of about 5nm. From the size data of nanosheet obtained in the TEM image, the nanosheet has small size and very thin thickness. In general, a small size results in a larger specific surface area, thereby exposing more reactive sites, which is beneficial to the improvement of the photocatalytic activity of tungsten trioxide. From the high-resolution image (b), a lattice fringe with a lattice spacing of 0.383nm can be observed, corresponding to the (002) crystal plane of the hexagonal phase tungsten trioxide. Since the two-dimensional lattice fringes were not found during the test, the exposed crystal faces of the sample could not be determined for the time being, but it was confirmed that the sides of the synthesized ultra-thin nanosheet were exposed as (002) crystal faces.
More details, please visit:
http://www.tungsten-powder.com/Tungsten-Trioxide.html
