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Chemical vapor deposition of photocatalytically active pure Brookite TiO2 thin films

DOI: 10.1021/acs.chemmater.7b04944 DOI Help

Authors: Abdullah M. Alotaibi (University College London) , Sanjayan Sathasivam (University College London) , Benjamin A. D. Williamson (University College London) , Andreas Kafizas (University College London (UCL)) , Carlos Sotelo-Vazquez (University College London) , Alaric Taylor (University College London) , David O. Scanlon (University College London; Diamond Light Source) , Ivan P. Parkin (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: February 2018

Abstract: Brookite is the least investigated phase of TiO2 due to the synthetic difficulty of obtaining the pure phase. Here, we present the first ever chemical vapor deposition synthesis of pure brookite TiO2 thin films. The films were highly crystalline and phase pure as determined by X-ray diffraction and Raman spectroscopy studies. Scanning electron microscopy studies showed the films to have a structured morphology consisting of pyramidal features. The photocatalytic properties of the brookite film, tested using stearic acid under UVA (365 nm) irradiation, were superior to both an anatase film grown under similar conditions and NSG Activ glass. Transient absorption spectroscopy showed that the innate electron–hole recombination dynamics are similar in brookite and anatase, akin to previous reports. The superior activity of the brookite film is hence attributed to the higher surface area compared to anatase.

Journal Keywords: Thin films; Oxides; Minerals; Electrical conductivity; Recombination

Diamond Keywords: Photocatalysis

Subject Areas: Materials, Chemistry, Physics

Technical Areas:

Added On: 19/02/2018 14:22

Discipline Tags:

Catalysis Physical Chemistry Materials Science Physics Surfaces interfaces and thin films Chemistry

Technical Tags: