Distance-Dependent Plasmon-Enhanced Fluorescence of Submonolayer Rhodamine 6G by Gold Nanoparticles

Nanoscale Research Letters

Xiaoyu Yang¹  Yiting Liu¹  Shitao Lou¹  Yuyi Zhang¹  Botao Wu¹  E. Wu²  Xiaolei Zhang²  Shikang Liu²  Yajie Bian²  Qingyuan Jin² 

[1] State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, People’s Republic of China;State Key Laboratory of Precision Spectroscopy, East China Normal University, 200241, Shanghai, People’s Republic of China;Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006, Taiyuan, Shanxi, People’s Republic of China;

关键词: Rhodamine 6G molecule;    Gold nanoparticles;    Poly (methyl methacrylate);    Photoluminescence;    Plasmon-enhanced fluorescence;    Quenching effect;    Atomic force microscope;    Scanning tunneling microscope;    Finite-difference time-domain method;   

DOI  :  10.1186/s11671-021-03546-7

来源: Springer

【 摘 要 】

We investigate the fluorescence from submonolayer rhodamine 6G molecules near gold nanoparticles (NPs) at a well-controlled poly (methyl methacrylate) (PMMA) interval thickness from 1.5 to 21 nm. The plasmonic resonance peaks of gold NPs are tuned from 530 to 580 nm by the PMMA spacer of different thicknesses. Then, due to the plasmonic resonant excitation enhancement, the emission intensity of rhodamine 6G molecules at 562 nm is found to be enhanced and shows a decline as the PMMA spacer thickness increases. The variation of spectral intensity simulated by finite-difference time-domain method is consistent with the experimental results. Moreover, the lifetime results show the combined effects to rhodamine 6G fluorescence, which include the quenching effect, the barrier effect of PMMA as spacer layer and the attenuation effect of PMMA films.

【 授权许可】

CC BY