期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 126, 期 -, 页码 234-241出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2018.11.002
关键词
Titanium dioxide; Phenothiazine; Nanostructures; Spectroscopy; Optical properties
资金
- National Academy of Sciences of Ukraine [VC-188]
We studied the effect of the phenothiazine (PTZ) surface doping on the structural and optical properties of nanocrystalline titanium dioxide powder with a single anatase phase (A-TiO2). We found that the mixing and interaction of PTZ and A-TiO2 leads to the intense dark-blue color of PTZ-doped A-TiO2 (A/PTZ). The appearance of new bands in the Fourier transform IR spectrum indicated the formation of PTZ(center dot+) radical cations and reduced Ti3+ species as well as extra oxygen vacancies (V-o) in the TiO2 matrix. The UV-vis absorption spectrum of A/PTZ exhibited an increase in absorption in the visible region ( > 400 nm). The doping of A-TiO2 with PTZ causes a noticeable redshift of the absorption edge and a significant narrowing of the band gap by 0.24 and 0.49 eV for direct and indirect electronic transitions, respectively. The photoluminescence spectra show that the photoluminescence originating from Ti3+ and [V-o-Ti3+] states for A/PTZ is stronger than for A-TiO2 , but the excitonic photoluminescence of A/PTZ is quenched. An increased number of surface defects in A/PTZ can essentially increase the nonradiative charge recombination, and therefore may considerably enhance the photoactivity of the dark-blue TiO2 in the visible range of the spectrum.
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