ZNO NANOWIRES INTENDED FOR PHOTOCATALYSIS FOR WATER AND/OR AIR PURIFICATION

摘要

The present invention concerns a method of a growth of ZnO nanowires (6b) intended for photocatalysis in water and/or air depollution, comprising the following steps:- (i) cleaning a civil engineering element (1) having a volume (2) which presents external rough surfaces (4a, 4b, 4c, 4d) with asperities (3);- (ii) immerging the civil engineering element (1) at least partially in a seed layer solution (5) which is an alcoholic solution with ions Zn²⁺, with at least one given rough surface (4a) facing to the seed layer solution (5) for the impregnation of the given rough surface (4a) with asperities (3) by the seed layer solution (5);- (iii) taking the immerged civil engineering element (1), out of the seed layer solution (5), with the seed layer (5a) coating the asperities (3) of the given rough surface (4a), without controlling the coating thickness of the seed layer (5a) on the given coated rough surface (4a);- (iv) drying the given coated rough surface (4a);- (v) annealing the seed layer coating of the given coated rough surface (4a) to obtain ZnO nanocristallites (6a);- (vi) chemical bath deposition for direct growth of ZnO nanowires (6b) from the ZnO nanocristallites (6a) of the given coated rough surface of the civil engineering element.