研究目的
Investigating the stabilization of the cubic phase in scandium-doped zirconia nanocrystals synthesized with the sol-gel method at room temperature.
研究成果
The study successfully synthesized scandium-doped zirconia nanocrystals with a stable cubic phase at room temperature using a sol-gel method. The cubic phase was stabilized at 16 mol% Sc2O3 concentration, with a bandgap of 5.65 eV. The synthesized nanocrystals are promising for applications in photovoltaics and fuel cells.
研究不足
The study's limitations include the challenge of distinguishing between tetragonal and cubic phases due to close diffraction patterns and the lack of theoretical support for applying the Tauc plot to nanocrystals, which may affect bandgap calculations.
1：Experimental Design and Method Selection:
The study employed a sol-gel method for the synthesis of scandium-doped zirconia nanocrystals at room temperature. The method involved controlled hydrolysis of Sc-Zr precursors.
2：Sample Selection and Data Sources:
Precursors included zirconium (IV) propoxide solution and scandium (III) isopropoxide, with scandium concentrations varying from 3 to 16 mol%.
3：List of Experimental Equipment and Materials:
Equipment used included a TESCAN MAIA3 SEM device, PANalytical X’Pert Pro diffractometer, XploRA Raman confocal microscope, and BioMate 3S spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing precursors with isopropyl alcohol, adding to nitric acid solution, homogenizing, drying, and calcining. Characterization included SEM, EDS, XRD, Raman spectroscopy, and UV-Vis absorption measurements.
5：Data Analysis Methods:
XRD data were analyzed for phase identification, Raman spectra for phase distinction, and UV-Vis spectra for bandgap calculation using the Tauc plot method.
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PANalytical X’Pert Pro
X’Pert Pro
PANalytical
X-ray diffractometer for phase identification of the synthesized nanocrystals
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XploRA Raman confocal microscope
XploRA
HORIBA
Raman spectroscopy for distinguishing between tetragonal and cubic phases
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BioMate 3S
3S
Thermo Fisher Scientific
Spectrophotometer for recording UV-Vis absorption spectra
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zirconium (IV) propoxide solution
Sigma-Aldrich
Precursor for the synthesis of zirconia nanocrystals
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scandium (III) isopropoxide
Sigma-Aldrich
Dopant precursor for the synthesis of scandium-doped zirconia nanocrystals
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isopropyl alcohol
99.7%
Daejung
Solvent in the sol-gel synthesis process
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nitric acid
70%
Bio-Lab Chemicals
Used in the hydrolysis process of the sol-gel synthesis
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TESCAN MAIA3
MAIA3
TESCAN
Scanning electron microscopy for imaging the surface morphology of synthesized xerogel
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