Preparation and Photocatalytic Activity of -Deposited Fabrics

Abstract

Nanoscale titanium dioxide (TiO 2 ) photocatalytic films were deposited on the surface of polyester nonwovens by using direct current reactive magnetron sputtering. The effects of coating thickness on the surface structures and properties of TiO 2 -coated fabrics were investigated by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), and scanning electron microscope (SEM). The photocatalytic activity of the functional nonwoven fabrics was evaluated by the degradation of methylene blue. The test results proved that the grain sizes of the sputtered clusters increased and the coating layer became more compact with the increase of film thickness, but the composition of the sputtered films did not have any significant change. At the same time, the photocatalytic activity of TiO 2 -coated fabrics mostly depended on the film thickness which could lead to the optimum thickness for a particular application.

Micro-Patterning of Magnetron Sputtered Titanium Dioxide Coatings and Their Efficiency for Photocatalytic Applications

“…Though photocatalysis is typically described as a surface process, a number of authors highlight the influence of the coating thickness on the photocatalytic activity. Several studies proved the fact that coating photocatalytic activity increases with increasing thickness [47][48][49] until it reaches some critical value (usually reported as 300-400 nm), where further increase of the thickness does not affect the photocatalytic properties. While the initial improvement of photocatalytic activity with thickness is typically explained with the increased surface area of the thicker films, the latter phenomenon can be explained through the limited diffusion length of photogenerated charge carriers [49].…”

“…Several studies proved the fact that coating photocatalytic activity increases with increasing thickness [47][48][49] until it reaches some critical value (usually reported as 300-400 nm), where further increase of the thickness does not affect the photocatalytic properties. While the initial improvement of photocatalytic activity with thickness is typically explained with the increased surface area of the thicker films, the latter phenomenon can be explained through the limited diffusion length of photogenerated charge carriers [49]. Application of the stainless steel mesh as masks unsurprisingly resulted in thinner films, compared to non-masked titania; however, the fact that the increase in surface area was so remarkable that the thinnest coating of the array (TiO 2 -M26) exhibited the highest photocatalytic activity is worth highlighting.…”

Recent Progress in Magnetron Sputtering Technology Used on Fabrics

“…When TiO 2 [ 76 ] was used as an ultraviolet shielding agent, the performance of the rutile type was more effective than that of the anatase type. As the nano TiO 2 particles size increased, the nano film became more uniform and compact.…”

Photocatalytic activity of β-MnO2nanotubes grown on PET fibre under visible light irradiation

“…It is commonly accepted that wide bandgap semiconductors such as ZnO and TiO 2 are able to degrade RhB dye effectively under UV irradiation. [31,32] In the case of ZnO, the electrons in the conduction band and holes in the valence band of ZnO are high in reducing and oxidising power.…”