Synergistic Enhancement of Fluorescence Through Plasmon Resonance and Interfacial Charge Transfer by AgNC@AgAu<sub>x</sub> Core-Shell Quantum Dots.
basic_science · Level V
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- Record sourced from PubMed, PMID 39901465.
- Also identified by DOI 10.1002/adma.202415388.
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Abstract
Bimetallic core-shell quantum dots (QDs) hold great promise in elucidating the bimetallic synergism and optoelectronic devices. The synthesis and properties of AgNC@AgAu<sub>x</sub> QDs of core-shell heterostructure are reported. Significantly enhanced photoluminescence emission on these heterostructures is observed. These enhancements are attributed to electron injection and the surface plasmon-induced strong local electric field, which are observed through time-resolved transient absorption spectroscopy. X-ray absorption near edge structure spectra and density functional theory confirms the electron injection from the Ag core to the AgAu<sub>x</sub> shell. On the other hand, the plasmon resonance of the AgNC@AgAu<sub>x</sub> QDs has been studied by finite-element method analysis and time-resolved photoluminescence spectra. There are 94.06 times fluorescence enhancement and 32.40 times quantum yield improvement of oxygen content correlation compared to AgAu<sub>3</sub> QDs. It shows a perfect correlation coefficient of 98.85% for the detection of heavy metal Cu<sup>2+</sup> ions. Such Bimetallic core-shell heterostructures have great potential for future optoelectronic devices, optical imaging, and other energy-environmental applications.