Long term synthesis of needle crystal assembled TiO2 films in an aqueous solution

Crystals of TiO2 grew on substrates in aqueous solutions at 50 degrees C for 180 day. Long term synthesis brought us nano-structured films and information of crystal growth. The films showed 101 diffraction peak of anatase phase. Morphology of the crystals well developed to needle shapes. They stood perpendicular to the substrates. The films had nano-structured surfaces. Surface nanostructures would contribute to high sensitive sensors, solar cells, photocatalysis, etc. The films had high transparency compared to bare substrates in the range 360-525 nm.