Microwave-assisted hydrothermal synthesis of water-soluble AgInS2 quantum dots with enhanced photoluminescence

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ID: 320940
2026
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Abstract
Abstract We systematically investigated the hydrothermal synthesis of water-soluble AgInS2 (AIS) quantum dots (QDs) using N-acetyl-L-cysteine ligands, focusing on the effects of precursor composition, pH, ligand concentration, and reaction temperature on photoluminescence (PL) properties. Optimization of the precursor solution enabled the synthesis of AIS QDs with a PL quantum yield (QY) of 32% in aqueous solution. Furthermore, ZnS treatment significantly enhanced the PLQY to 68%. Structural analyses using X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy confirmed the formation of chalcopyrite-type AIS QDs and suggested the presence of Zn-containing surface species consistent with ZnS shell formation. PL decay measurements suggested that the broad PL of AIS QDs is consistent with donor–acceptor-pair-related emission, and optimization of precursor composition was suggested to suppress non-radiative recombination. These results provide important insights for the direct synthesis and PL enhancement of water-soluble cadmium-free QDs.
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Authors Kazuto Fukuda, Taisuke Nakatani, Yusuke Funakawa, DaeGwi Kim
Journal bulletin of the chemical society of japan
Year 2026
DOI
10.1093/bulcsj/uoag098
URL
https://doi.org/10.1093/bulcsj/uoag098
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