The preparation conditions are important for the structure and properties of black TiO2. In this paper, the black rutile TiO2 with a particle size of approximately 5 nm was prepared in vacuum by the infrared nano-second laser sputtering deposition method. The study
results indicated that the prepared black TiO2 exhibited high light absorption from UV to near-infrared region. The lattice distortion and Ti3+ were responsible for the upward shift in the valance band, and the oxygen vacancy states were determined to be located about
0.7–1.18 eV under the conduction band, narrowing the band gap of TiO2 from 3.2 eV to 2.1 eV. Although the black TiO2 exhibited strong adsorption effects within the full spectrum and had a higher free carrier density, the presence of excess oxygen defects resulted
in a higher recombination rate of the photo electron–hole pairs, which induced a poor photocatalytic performance of the black TiO2. This work facilitates the understanding of the mechanisms mechanism of black TiO2 formation via laser ablation, and emphasized the
need for the controllability and quantification of oxygen vacancies.
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Document Type: Research Article
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
Shanghai Institute of Spacecraft Equipment, Shanghai 200240, China
January 1, 2019
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