Synergistic Enhancement of Fluorescence Through Plasmon Resonance and Interfacial Charge Transfer by AgNC@AgAu <sub>x</sub> Core–Shell Quantum Dots
Abstract
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 x 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 x shell. On the other hand, the plasmon resonance of the AgNC@AgAu x 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 3 QDs. It shows a perfect correlation coefficient of 98.85% for the detection of heavy metal Cu 2+ ions. Such Bimetallic core–shell heterostructures have great potential for future optoelectronic devices, optical imaging, and other energy‐environmental applications.
Article Details
Authors (11)
Youlong Chen
State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Key Laboratory of Electronic Restriction of Anhui Province Advanced Laser Technology Laboratory of Anhui Province National University of Defense Technology Hefei 230037 P. R. China
Yihua Hu
Yushuang Zhang
Hao Huang
Xing Yang
College of Chemistry, Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, Jilin University, Qianjin Street 2699, Changchun 130012, China
Youlin Gu
State Key Laboratory of Pulsed Power Laser Technology National University of Defense Technology Key Laboratory of Electronic Restriction of Anhui Province Advanced Laser Technology Laboratory of Anhui Province National University of Defense Technology Hefei 230037 P. R. China
Fanhao Meng
Yuhao Xia
Ziwei Fu
Xinyuan Zhang
Junhao Chu
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics