期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 24, 页码 12735-12744出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp312422n
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资金
- ONR
- ARO
- NSF
- Sloan Research Foundation
- ACS/PRF
We used DNA origami as a platform to coassemble a 20 nm gold nanoparticle (AuNP) and an organic fluorophore (TAMRA) and studied the distance-dependent plasmonic interactions between the particle and the dye using steady state fluorescence and lifetime measurements. Greater fluorescence quenching was found at smaller dye-particle distances, which was accompanied by an enhancement of the decay rate. We also fabricated 20 and 30 tun AuNP homodimers using DNA origami scaffolds and positioned a Cy3 fluorophore between the AuNPs in both assemblies. For each particle size, three different interparticle distances were investigated. Up to 50% enhancement of the Cy3 fluorescence quantum efficiency was observed for the dye between the 30 nm AuNPs. These results are in good agreement with the theoretical simulations.
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