研究目的
To study the defects induced in doped ZnO/SiO2 with Co, Mn and Cu and their effect on optical properties of nanocomposites.
研究成果
Rietveld analysis confirmed that all samples have a single phase with hexagonal structure. The unit cell volume increased in Cu and Mn-doping and decreased in the case of Co-doped sample. The energy gap of doped samples was less than the undoped sample. PL emission of doped samples had less intensity and were broader than the undoped sample. The study provides insights into the structural and optical modifications induced by doping in ZnO/SiO2 nanocomposites.
研究不足
The study focuses on the structural and optical properties of doped ZnO/SiO2 nanocomposites, but the potential applications and performance in real-world scenarios are not explored. The synthesis method and doping concentrations may also limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The synthesis of undoped and doped ZnO/SiO2 nanocomposites was performed using the sol-gel method. The samples were prepared by dissolving the acetates in water and ethylene glycol, followed by stirring until complete dispersion. The resulting clear solutions were heated for gelation and then calcined at high temperatures.
2：Sample Selection and Data Sources:
The samples included undoped ZnO/SiO2 and doped ZnO/SiO2 with Co, Mn, and Cu. The structural and optical properties were analyzed using various techniques.
3：List of Experimental Equipment and Materials:
Panalytical diffractometer (X'pert MPD) for XRD, Hitachi HD-2700 TEM for nanocrystallites’ shape and clustering, SEM model Quanta FEG-250 for element identification, Bruker Tensor 27 FTIR spectrometer for FTIR, UV-vis (Model Tomos UV-1800) for UV-vis, and luminescence (RF-1501 SHIMADZU, Ltd) spectrophotometers for PL measurements.
4：Experimental Procedures and Operational Workflow:
The gels were heated at 300 °C (4 h) then 700 °C (1h). XRD data was gathered and analyzed using MAUD software. TEM, SEM, FTIR, UV-vis, and PL measurements were performed as per standard procedures.
5：Data Analysis Methods:
Rietveld refinement was used for microstructure analysis of the samples. The optical band gap was established using the Tauc model for direct transition in the high absorption region.
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