Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 52, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aae633
Keywords
semiconductor; bismuth oxides; hydrothermal synthesis; optical properties; photocatalysis
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A1B03029432]
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(Ni,F)-doped alpha-Bi(2)O(3 )nanomaterials were successfully prepared via a facile hydrothermal reaction route. The well-crystallized nanorods have a diameter of 50-150nm and a length of 1-2.5 Am. The phase formations were studied via x-ray powder diffraction (XRD) together with structural Rietveld refinements. The incorporations of Ni2+ and F- ions in alpha-Bi2O3 lattices were discussed in relation to the energy dispersive x-ray analysis, x-ray photoelectron spectroscopy and XRD measurements. The band structure of alpha-Bi2O3 was greatly modified via Ni2+-, F--codoping in the lattices, resulting in a red shift of the optical absorption edge and a narrowed band energy from 2.8 eV to 2.46 eV. Compared with the direct-allowed feature of pure alpha-Bi2O3, the indirect transition was shown in the (Ni,F)-doped sample. The valence band and conduction band of (Ni,F)-doped alpha-Bi2O3 were the hybridized (Bi6s+O2p+Ni3d) and (Bi6p+Ni3d), respectively. The photocatalytic activities on the photodegradation of rhodamine B were significantly improved in the (Ni,F)-doped sample. The effective photocatalysis was discussed in relation to the improved visible-light response, the modified band structure, and the longer dynamic luminescence decay. The longer recombination between the light-created electrons and holes was verified by the transition lifetimes in (Ni,F)-doped alpha-Bi2O3 nanorods. The reported hydrothermal synthesis was an advantageous approach to preparing alpha-Bi2O3; it is simple, has a low reaction temperature, no post-sintering is required, no template or surfactant is necessary, it suitable for large-scale production, it is low cost, etc.
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