Photoluminescence, surface photovoltage and photocatalytic properties of BaBiO3 powders
Polycrystalline BaBiO3 (BBO) powders were synthesized at different calcined temperature using a solid state reaction method. X-ray diffraction analysis confirms that the compounds are a monoclinic structure with space group C2/m. The average particle size increases with the increasing synthesized temperature observed by scanning electronic microscopy. The band gap of the powder is calculated to be about 1.8 eV according to the absorption edge of 620 nm. The surface photovoltage spectroscopy reveals that the powder demonstrates two strongest surface photovoltage response peaks at 400 and 470 nm, which may be due to the surface states caused by the defects and oxygen vacancies in the band gap. The photoluminescence spectra show that the recombination rate of the photo-carriers decreases with the increase of synthesized temperatures, correspondingly, the intensity of the emission spectra decreases. In addition, the strong photocatalytic decoloration effect on methylene blue could further corroborate photo-generated carriers behavior in the BBO powders.
This work was supported by the research projects of the Scientific and Technological Department of Henan Province (172102210013).
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