研究目的
To investigate the effect of strontium doping on the band gap of CeO2 nanoparticles synthesized via a facile co-precipitation method, aiming to tune the band gap for potential applications in UV shielding and optoelectronics.
研究成果
Sr-doping successfully widened the band gap of CeO2 nanoparticles from 3.2 eV to 3.8 eV with increasing dopant concentration, attributed to the Burstein-Moss effect and creation of surface defects. This tuning of band gap enhances the material's potential for applications in UV shielding, such as in sunscreens, and in optoelectronic devices. Future studies could focus on reducing agglomeration and testing practical applications in cosmetics and electronics.
研究不足
The synthesized nanoparticles showed agglomeration due to high surface energy and absence of capping agents, which could affect dispersion and application performance. The method may have limitations in scalability or reproducibility for industrial applications. Potential optimizations include using capping agents to reduce agglomeration or exploring other synthesis methods for better control over particle size and distribution.
1：Experimental Design and Method Selection:
The study employed a facile aqueous co-precipitation method for synthesizing pure and Sr-doped CeO2 nanoparticles without capping agents, chosen for its simplicity and effectiveness in producing nanomaterials. Theoretical models included Debye-Scherrer analysis for crystallite size determination and Tauc plot method for band gap calculation.
2：Sample Selection and Data Sources:
Samples included pure CeO2, 3 mol% Sr-doped CeO2, and 5 mol% Sr-doped CeO2 nanoparticles. Precursors were high-purity analytical grade chemicals procured from specified suppliers.
3：List of Experimental Equipment and Materials:
Equipment included a Bruker D 8 Advanced diffractometer for XRD, ZEISS SUPRA SEM, FEI Tecnai T20 TEM, Renishaw Raman microscope, and JASCO V670 UV-Vis spectrophotometer. Materials were cerium nitrate hexahydrate, strontium chloride hexahydrate, ammonia solution, ethanol, and double-distilled water.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving precursors in water, heating at 50°C with stirring, adding ammonia to precipitate, washing with water and ethanol, drying at 60°C, and annealing at 200°C. Characterization steps included XRD for structure, SEM and TEM for morphology, EDX for composition, Raman for defects, and UV-Vis for optical properties.
5：Data Analysis Methods:
Data were analyzed using Debye-Scherrer equation for crystallite size, Kubelka-Munk function for absorption coefficient, and Tauc plot for band gap determination. Statistical techniques were not explicitly mentioned.
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