Journal
ACS NANO
Volume 13, Issue 10, Pages 12184-12191Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b06858
Keywords
boron nitride; metal-enhanced fluorescence; dielectric spacer; plasmonic nanoparticle; fluorescence quenching; two-dimensional materials
Categories
Funding
- Australian Research Council (ARC) [DE160100796]
- VILLUM FONDEN [16498]
- ARC [DP180100077, DP190101058]
- Elemental Strategy Initiative
- CREST, JST [JPMJCR15F3]
- EPSRC [EP/N025938/1] Funding Source: UKRI
- Australian Research Council [DE160100796] Funding Source: Australian Research Council
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Metal-enhanced fluorescence (MEF) considerably enhances the luminescence for various applications, but its performance largely depends on the dielectric spacer between the fluorophore and plasmonic system. It is still challenging to produce a defect-free spacer having an optimized thickness with a sub-nanometer accuracy that enables reusability without affecting the enhancement. In this study, we demonstrate the use of atomically thin hexagonal boron nitride (BN) as an ideal MEF spacer owing to its multifold advantages over the traditional dielectric thin films. With rhodamine 6G as a representative fluorophore, it largely improves the enhancement factor (up to similar to 95 +/- 5), sensitivity (10(-8) M), reproducibility, and reusability (similar to 90% of the plasmonic activity is retained after 30 cycles of heating at 350 degrees C in air) of MEF. This can be attributed to its two-dimensional structure, thickness control at the atomic level, defect-free quality, high affinities to aromatic fluorophores, good thermal stability, and excellent impermeability. The atomically thin BN spacers could increase the use of MEF in different fields and industries.
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