Facile and Fast Deposition of Amorphous Ti<scp>O</scp>₂ Film under Atmospheric Pressure and at Room Temperature, and its High Photocatalytic Activity under <scp>UV</scp>‐<scp>C</scp> Light

Abstract

A facile and fast CVD method for the deposition of TiO 2 films, under atmospheric pressure and at room temperature, onto glass and polyethylene terephthalate (PET) substrates is explored. The hydrolysis reaction of titanium tetraisopropoxide (TTIP) is employed for the deposition of TiO 2 film, and the corresponding deposition rate determined. The surface morphology of the as‐deposited TiO 2 films is observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). In order to confirm the structure, composition, and optical properties of the films, X‐ray diffraction (XRD), Raman spectroscopy (RS), Fourier transform infrared (FTIR) spectroscopy, X‐ray photoelectron spectroscopy (XPS), and UV‐Vis absorption spectroscopy are employed. The as‐deposited TiO 2 films are amorphous with a band gap energy of around 3.42 eV and rich in surface OH groups, which exhibit very high photocatalytic activity for complete oxidation of HCHO in simulated air under UV‐C irradiation.