研究目的
To prepare mesoporous SiO2/Sm composite materials using the sol-gel method and evaluate their luminescent characteristics, particularly in the near infrared region.
研究成果
Mesoporous SiO2/Sm composite materials were successfully prepared via sol-gel method, exhibiting amorphous structures and maintained mesoporous properties. The use of HNO3 as a catalyst resulted in stronger luminescent intensity, and calcination enhanced luminescence by forming Sm2O3. The materials show promise for applications in optics due to their efficient near infrared luminescence.
研究不足
The study is limited to specific synthesis conditions and catalysts (HNO3 and HF), and the luminescence properties may vary with different rare earth ions or matrix materials. The calcination process affects the material structure and luminescence, indicating potential optimization areas in thermal treatment.
1：Experimental Design and Method Selection:
The study used the sol-gel synthesis method to prepare mesoporous SiO2 aerogel doped with Sm3+ ions. Four different samples were prepared by varying catalysts and calcination steps to investigate the effects on material structure and luminescence.
2：Sample Selection and Data Sources:
Samples were synthesized from chemicals including TEOS, TMCS, anhydrous ethanol, SmCl3, and catalysts (HNO3 or HF). Deionized water was used in all experiments.
3：List of Experimental Equipment and Materials:
Equipment included Siemens D5005 diffractometer for XRD, Bruker Vertex 70 FT-IR spectrometer for IR analysis, Micromeritics ASAP2010M for nitrogen adsorption-desorption, JEOL 2010 TEM, JEOL JSM-5600L SEM, and HORIBA Jobin Yvon FluoroLog-3 spectrofluorometer for luminescence measurements. Materials were as specified in the chemicals section.
4：Experimental Procedures and Operational Workflow:
Four methods were used: Method one involved dissolving SmCl3 in ethanol and water, adding TEOS and HNO3 catalyst, aging, solvent exchange with hexane, modification with TMCS, and drying. Method two calcined sample 1 at 550°C. Method three used a mixed catalyst (HNO3:HF=1:1) similar to method one. Method four calcined sample 3 at 550°C. Characterization included XRD, FT-IR, SEM, TEM, nitrogen adsorption-desorption, and luminescence spectroscopy.
5：Data Analysis Methods:
Data were analyzed using BET method for surface area, BJH method for pore size distribution, and standard techniques for interpreting XRD, FT-IR, SEM, TEM, and luminescence spectra.
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