研究目的
To synthesize luminescent sulfur quantum dots (Sdots) using sodium thiosulphate and investigate their application in the discrimination of multiple metal ions.
研究成果
The study successfully synthesized luminescent Sdots using a fast and efficient method, demonstrating their potential as a dual-function probe for the sensing of metal ions. The Sdots showed preferential selectivity towards Co2+ ions and could colorimetrically distinguish multiple metal ions, contributing to the advancement of sulfur-based nanomaterials.
研究不足
The study is limited by the quantum yield of Sdots (2.5%) and the specificity of the colorimetric response to certain metal ions. Further optimization of the synthesis method and exploration of the sensing mechanism are needed.
1：Experimental Design and Method Selection:
The synthesis of Sdots involved the reaction of sodium thiosulphate and oxalic acid in deionized water with PEG-400, followed by etching with NaOH.
2：Sample Selection and Data Sources:
The samples were prepared in aqueous medium, and the optical properties were analyzed using UV-visible absorption and photoluminescence spectroscopy.
3：List of Experimental Equipment and Materials:
Sodium thiosulphate, oxalic acid, PEG-400, NaOH, deionized water, round bottom flask, UV-visible spectrophotometer, photoluminescence spectrometer.
4：Experimental Procedures and Operational Workflow:
The reaction mixture was stirred at 70°C for 2 hrs, followed by the addition of NaOH and further heating. The product was purified by dialysis.
5：Data Analysis Methods:
The photoluminescence spectra were analyzed for excitation-dependent behavior, and the quenching effect of metal ions on the PL intensity was studied.
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