Significant amplification of surface enhanced Raman scattering(SERS)signals can be achieved mainly by the electric field enhancement in metal core-shell nanostructures,and the enhanced magnetic field is rarely studied...Significant amplification of surface enhanced Raman scattering(SERS)signals can be achieved mainly by the electric field enhancement in metal core-shell nanostructures,and the enhanced magnetic field is rarely studied.In this study,we prepared multi-gap Au/AgAu core-shell hybrid nanostructures by using gold nanocup as the core.The overgrowth processes to grow one,two,and three layers of AgAu hybrid nanoshells can produce Au/AgAu^(1),Au/AgAu^(2),and Au/AgAu^(3) heteronanostructures.The strong plasmon coupling between the core and shell leads to significant electromagnetic field enhancement.Under the synergistic effect of electromagnetic plasmon resonance and plasmon coupling,Au/AgAu core-shell hybrid nanostructures exhibit excellent SERS signals.We also investigate the effect of the interstitial position of the rhodamine B(RhB)molecule on Raman enhancement in Au/AgAu~3 heteronanostructures.This study can provide new ideas for the synthesis of multi-gap Raman signal amplifiers based on magnetic plasmon coupling.展开更多
This paper investigates the factors which can influence the quenching effect from the perspective of energy transfer.The quenched fluorescence of the Cd Se semiconductor quantum dots(SQDs)by using plasmonic Au nanocry...This paper investigates the factors which can influence the quenching effect from the perspective of energy transfer.The quenched fluorescence of the Cd Se semiconductor quantum dots(SQDs)by using plasmonic Au nanocrystals(p-AuNCs)and molecule-like Au nanocrystals(m-AuNCs)in aqueous suspensions and spin-coated films is comparatively investigated.In the aqueous suspensions,the p-AuNCs have larger quenching effect than the m-AuNCs.In the spin-coated films,the p-AuNCs and m-AuNCs have comparable quenching factor.Furthermore,the experiments show that the p-AuNCs simultaneously enhance the radiative and nonradiative rates.But the m-Au NCs only enhance the nonradiative rate of the SQDs,which reveals the difference of quenching process between the p-AuNCs and m-AuNCs.This result of the research has guiding significance for the detection technique based on the fluorescence quenching.展开更多
基金Supported by the National Natural Science Foundation of China(12274379,11904332 and 11904270)。
文摘Significant amplification of surface enhanced Raman scattering(SERS)signals can be achieved mainly by the electric field enhancement in metal core-shell nanostructures,and the enhanced magnetic field is rarely studied.In this study,we prepared multi-gap Au/AgAu core-shell hybrid nanostructures by using gold nanocup as the core.The overgrowth processes to grow one,two,and three layers of AgAu hybrid nanoshells can produce Au/AgAu^(1),Au/AgAu^(2),and Au/AgAu^(3) heteronanostructures.The strong plasmon coupling between the core and shell leads to significant electromagnetic field enhancement.Under the synergistic effect of electromagnetic plasmon resonance and plasmon coupling,Au/AgAu core-shell hybrid nanostructures exhibit excellent SERS signals.We also investigate the effect of the interstitial position of the rhodamine B(RhB)molecule on Raman enhancement in Au/AgAu~3 heteronanostructures.This study can provide new ideas for the synthesis of multi-gap Raman signal amplifiers based on magnetic plasmon coupling.
基金Supported by the Natural Science Foundation of Educational Commission of Auhui Province of China(KJ2019A0567)the National Natural Science Foundation of China(11904332)+3 种基金the Natural Science Foundation of Zhejiang Province(LQQ20A040001)Hubei Key Laboratory of Optical Information and Pattern Recognition by Wuhan Institute of Technology(202004)Hunan Provincial Natural Science Foundation(2020JJ4935)Scientific Research Fund of Hunan Provincial Education Department(20B602)
文摘This paper investigates the factors which can influence the quenching effect from the perspective of energy transfer.The quenched fluorescence of the Cd Se semiconductor quantum dots(SQDs)by using plasmonic Au nanocrystals(p-AuNCs)and molecule-like Au nanocrystals(m-AuNCs)in aqueous suspensions and spin-coated films is comparatively investigated.In the aqueous suspensions,the p-AuNCs have larger quenching effect than the m-AuNCs.In the spin-coated films,the p-AuNCs and m-AuNCs have comparable quenching factor.Furthermore,the experiments show that the p-AuNCs simultaneously enhance the radiative and nonradiative rates.But the m-Au NCs only enhance the nonradiative rate of the SQDs,which reveals the difference of quenching process between the p-AuNCs and m-AuNCs.This result of the research has guiding significance for the detection technique based on the fluorescence quenching.
