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Extraction of High-Quality Quantum Dot Photocatalysts via Combination of Size Selection and Electrochemiluminescence
摘要： Quantum dots (QDs) represent one of the most promising photocatalytic systems for solar hydrogen production. Tremendous works have been devoted to the design of QDs photocatalysts, but their further development is limited by the unwanted mix of high- and low-quality QDs with different activities. With multinary Ag-In-Zn-S (AIZS) QDs as an example, here, we present a simple method for the extraction and screening of efficient photocatalysts by combination of gradient centrifugation and electrochemiluminescence (ECL). With controllable introduction of poor solvent, the crude QDs were separated into five individual samples by gradient centrifugation, from which ECL tests were performed to get the surface state information for photocatalyst screening. By the combination of size-selective centrifugation and ECL screening, we were able to get the high-activity component (AIZS-#4), which achieved 1.68 mmol·g?1 h?1, 6 times higher than that of the initial AIZS QDs. This work provides an alternative useful pathway for obtaining high-quality QD photocatalysts, beyond pursuing of perfect synthetic conditions.
关键词： size selection,electrochemiluminescence,quantum dots,photocatalysis,I-III-VI
更新于2025-11-14 15:32:45
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Facile, large scale synthesis of water soluble AgInSe2/ZnSe quantum dots and its cell viability assessment on different cell lines
摘要： I-III-VI chalcopyrite ternary quantum dots have emerged as a good alternative over the conventional II-VI and IV-VI chalcogenide binary QDs that usually consist of heavy metals such as Cd and Pb which has limited their bioapplications. Among the chalcopyrite QDs, AgInSe2 QDs has been the least developed due to the imbalanced cation reactivity, unwanted impurities, broad size distribution and resultant large particle sizes. In addition, the cell viability of these QDs still needs to be investigated on different cell lines both normal and cancerous ones. Herein, large-scale synthesis of water-soluble thioglycolic acid (TGA) capped and gelatin-stabilized AgInSe2 (AISe) core and AgInSe2/ZnSe (AISe/ZnSe) core/shell QDs in the absence of an inert atmosphere and their cell viability against different cell lines are reported. The optical and structural characteristics of the as-synthesized QDs were investigated by UV–visible (vis) absorption, photoluminescence (PL) and Fourier-transmission infrared (FTIR) spectroscopies, dynamic light scattering (DLS), X-ray diffraction (XRD), and high-resolution transmission electron microscope (HRTEM) techniques. Growth of ZnSe shell on the core AISe resulted in the blue shifting of the emission maximum position with the increased PL intensity. The QDs are small and spherical in shape with an average particle diameter of 2.8 nm and 3.2 nm for AISe and AISe/ZnSe QDs respectively. The in vitro cell viability assay revealed that the as-synthesized AISe/ZnSe QDs are not toxic towards cancerous (HeLa -cervical cancer and A549-lung cancer) and normal (BHK21 –Kidney) cell lines.
关键词： I-III-VI quantum dots,Cell viability,AgInSe2/ZnSe,Biocompatibility
更新于2025-09-12 10:27:22