Enhanced fluorescence of a dye on DNA-assembled gold nanodimers discriminated by lifetime correlation spectroscopy
| Autor: | S. A. M. Martins, Sílvia M. B. Costa, A. Jóskowiak, Pedro M. R. Paulo, Duarte M. F. Prazeres, Peter Zijlstra, David Botequim |
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| Přispěvatelé: | Molecular Biosensing for Med. Diagnostics |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Confocal Surface plasmon Relaxation (NMR) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Colloidal gold Physical and Theoretical Chemistry 0210 nano-technology Two-dimensional nuclear magnetic resonance spectroscopy Excitation Plasmon |
| Zdroj: | Journal of Physical Chemistry C, 122(20), 10971-10980. American Chemical Society |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The surface plasmon modes of metal nanoparticles provide a way to efficiently enhance the excitation and emission from a fluorescent dye. We have employed DNA-directed assembly to prepare dimers of gold nanoparticles and used their longitudinally coupled plasmon mode to enhance the fluorescence emission of an organic red-emitting dye, Atto-655. The plasmon-enhanced fluorescence of this dye using dimers of 80 nm particles was measured at the single-molecule detection level. The top enhancement factors were above 1000-fold in 71% of the dimers within a total of 32 dimers measured, and in some cases, they reached almost 4000-fold, in good agreement with model simulations. Additionally, fluorescence lifetime correlation analysis enabled the separation of enhanced from nonenhanced emission simultaneously collected in our confocal detection volume. This approach allowed us to recover a short relaxation component exclusive to enhanced emission that is attributed to the interaction of the dye with DNA in the interparticle gaps. Indeed, the frequency of enhancement events is larger than that expected from the volume occupancy of the gap region, thus suggesting that the interaction of the dye with DNA linkers favors the observation of emission enhancement in our dimer particles. |
| Databáze: | OpenAIRE |
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