研究目的
To fabricate two-dimensional Nb2C quantum dots with high quantum yield and green fluorescence for applications in biological sensing and 3D brain organoid labeling.
研究成果
The study successfully developed highly fluorescent green photoluminescent S,N-MQDs with a PLQY of up to 19%, the highest reported for Nb2C dots. These dots showed excellent stability and were effectively used for 3D brain organoid labeling, indicating their potential in biological sensing applications.
研究不足
The study mentions that high levels of MQDs could induce cytotoxicity through oxidative stress and dysfunction of autophagy, indicating a limitation in the concentration that can be safely used in biological applications.
1：Experimental Design and Method Selection:
The study involved the synthesis of S,N co-doped Nb2C MQDs (S,N-MQDs) using layered Nb2C nanosheet as a precursor and L-cysteine as a source of sulfur and nitrogen. The synthesis was carried out through a hydrothermal method.
2：Sample Selection and Data Sources:
The samples included pristine Nb2C, MQDs, N-MQDs, and S,N-MQDs. Characterization was performed using SEM, TEM, AFM, FTIR, XPS, and XRD.
3：List of Experimental Equipment and Materials:
Equipment used included SEM, TEM, AFM, FTIR spectrometer, XPS, and XRD. Materials included Nb2C nanosheets and L-cysteine.
4：Experimental Procedures and Operational Workflow:
The synthesis involved acid reflux and hydrothermal treatment. The products were characterized for their structural, optical, and electronic properties.
5：Data Analysis Methods:
Data analysis included measuring PLQY, lifetime, and stability under various conditions. DFT calculations were employed to understand the doping effect on QY.
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