Patent ID: 8728576
Filing Date: 2014-05-20
Classification: B01J,C23C

Abstract:
1. A method for manufacturing photocatalytically active titanium dioxide layers using gas phase hydrolysis, comprising: directing a titanium compound present in the gas phase through a first passage of a gas supply apparatus and a water vapor through a second passageway of the gas supply apparatus onto a preheated substrate to form a photocatalytically active titanium dioxide layer on a surface of a substrate by chemical reaction; wherein the titanium compound and the water vapor are supplied first separately from each other through the first and second passages, respectively, and are mixed upon exiting the first and second passages, wherein the supply of the titanium compound and the water vapor takes place in such a manner that a flow speed of at least 0.5 m/s is achieved, wherein a time period between a first contact of the two gases up to the impact on the surface of the substrate is kept lower than 0.05 s, wherein a maximum spacing between outlet openings for the titanium compound and the water vapor from the surface of the substrate is 20 mm, and wherein the formation of the titanium dioxide layer is carried out at atmospheric pressure in one deposition step.