Full
LIAO Rui (1998-), female, Bachelor candidate. E-mail: 2362167859@qq.com
Outline
Different rare earth ions (i.e., Nd3+, Y3+, Eu3+) doped BiVO4 nanocrystals were synthesized by a chemical protocol method. The phase composition, crystal structure, morphology, local structure, surface chemistry and spectral properties of the nanocrystal samples were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, ultraviolet-visible diffusion reflective spectroscopy and photoluminescence spectroscopy. The results show that the sizes of different ion-doped BiVO4 crystals are in nanoscale, the BiVO4 nanocrystals doped with different ions have a tetragonal crystal structure. and the obtained nanocrystals have regular morphologies and clear profiles, indicating that the obtained nanocrystals have a good crystallization performance and exhibit a certain degree of lattice distortion. Raman peaks of doped BiVO4 nanocrystals appear at about 247, 367, 763 and 855 cm-1, which are consistent with the characteristic vibration frequencies of BiVO4 structure with tetragonal phase. UV-visible diffuse reflectance spectrum shows that the internal electronic structure of the BiVO4 nanocrystals changes after doping ions, the band gap energies of BiVO4, Eu:BiVO4, Y:BiVO4 and Nd:BiVO4 nanocrystal are 2.50, 2.74, 2.90 and 2.94 eV, respectively, indicating that doping different ions could regulate the band gap of the semiconductor nanocrystals. Based on the results by photoluminescence spectroscopy, the minimum luminescence intensity of Eu:BiVO4 nanocrystals is obtained, showing the minimum electron hole recombination efficiency, which is suggested that the Eu:BiVO4 nanocrystals has higher photocatalytic activity. The maximum luminescence intensity of Y:BiVO4 nanocrystal is obtained, thus having the maximum electron hole recombination efficiency.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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