研究目的
To develop a facile aqueous-phase synthesis method for highly fluorescent and color-tunable AgInS2 (AIS) and (AgInS2)x(ZnS)1?x (AIZS) quantum dots (QDs) using 3-mercaptopropionic acid (3-MPA) as a ligand, aiming to achieve high photoluminescence quantum yields (PL QYs) for applications in bioimaging and sensing.
研究成果
AIS and AIZS QDs with various Ag/In ratios were efficiently prepared via an aqueous method using 3-MPA as a capping ligand. The PL QYs of AIZS QDs were markedly increased (up to 65%) due to the alloying of AIS cores with ZnS. Size and composition-selections allowed the separation of up to 13 fractions of AIZS QDs with exceptionally high PL QYs (up to 78%), making them highly potential for biological applications.
研究不足
The PL QY of AIS cores is modest (less than 10%), and the synthesis requires optimization of the Ag/In ratio and reaction conditions to achieve high PL QYs. The atypical blue-shift of the PL emission with increasing Ag/In ratio needs further investigation.
1：Experimental Design and Method Selection
A one-pot, two-step method was developed for the preparation of AIZS QDs. AIS cores were prepared by solubilizing Ag and In precursors in a 0.2 M 3-MPA aqueous solution adjusted to pH 8.5, followed by the injection of an aqueous solution of Na2S and heating the mixture at 100 °C. In the second step, Zn(OAc)2 was injected into the AIS QDs solution, and the mixture was stirred for ca. 120 min at reflux.
2：Sample Selection and Data Sources
Precursors used were AgNO3, In(NO3)3, Zn(OAc)2, and Na2S with 3-MPA as the ligand. The Ag/In ratio was varied from 1/60 to 2/1 to tune the optical properties of the QDs.
3：List of Experimental Equipment and Materials
AgNO3, In(NO3)3, Zn(OAc)2, Na2S, 3-MPA, NaOH, EtOH, Milli-Q water.
4：Experimental Procedures and Operational Workflow
The synthesis involved the preparation of AIS cores followed by alloying and shelling with ZnS. The reaction conditions, including temperature and precursor ratios, were varied to optimize the PL properties. Size and composition-selective precipitations were conducted to separate fractions of QDs with high PL QYs.
5：Data Analysis Methods
UV?visible absorption and PL spectroscopy were used to monitor the growth of QDs. TEM, XRD, FT-IR, XPS, DLS, and zeta potential measurements were employed for characterization. PL QYs were determined relative to Rhodamine 6G in ethanol.
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