Journal
NANOSCALE RESEARCH LETTERS
Volume 16, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s11671-021-03546-7
Keywords
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
Funding
- National Key R&D Program of China [2017YFA0303403]
- National Natural Science Foundation of China [11674095, 11874015, 11674099, 11722431]
- Shanghai International Cooperation Project [16520710600]
- Program of Introducing Talents of Discipline to Universities [B12024]
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This study investigates the fluorescence behavior of submonolayer rhodamine 6G molecules near gold nanoparticles by controlling the PMMA spacer thickness. It was found that the plasmonic resonance peaks of gold NPs can be tuned by the PMMA spacer, affecting the emission intensity of rhodamine 6G molecules.
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.
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