研究目的
Investigating the effects of precursor concentration on the structural and optical properties of chemically synthesized CdS/PbS core/shell nanoparticles.
研究成果
The CdS/PbS core/shell nanoparticles were successfully synthesized with hexagonal phase polycrystalline structure. The particle size and optical properties were found to be dependent on the precursor concentrations. The study provides insights into the tunability of optical properties through precursor concentration adjustments, suggesting potential applications in optoelectronics and bio-sensing.
研究不足
The study is limited to the chemical synthesis method and the specific precursor concentrations used. The environmental and bio-compatibility aspects of the nanoparticles were not extensively explored.
1：Experimental Design and Method Selection:
The study involved the synthesis of CdS/PbS core/shell nanoparticles using the chemical bath deposition (CBD) method with different core and shell precursor concentrations. Glycerol was used as a capping agent.
2：Sample Selection and Data Sources:
Samples were prepared with three different core precursor concentrations (30 mM, 50 mM, and 70 mM) and corresponding shell precursor concentrations (3 mM, 5 mM, and 7 mM).
3：List of Experimental Equipment and Materials:
Precursors included glycerol, lead acetate, cadmium acetate, thiourea, and ammonia. Characterization techniques included XRD, HRTEM, EDX, UV-Vis absorption, and PL spectroscopy.
4：Experimental Procedures and Operational Workflow:
The synthesis involved preparing CdS core nanoparticles first, followed by epitaxial growth of PbS shell. The mixture was stirred and refluxed, then washed and filtered for characterization.
5：Data Analysis Methods:
The crystalline size was estimated using the Debye-Scherrer formula, and the band gap was determined from Tauc’s plot. Strain and size were analyzed using Williamson-Hall plot.
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