Journal
ACS NANO
Volume 7, Issue 11, Pages 9798-9807Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4033097
Keywords
metal nanoclusters; fluorescent nanoclusters; DNA nanotechnology; FRET; nanocluster rods; fluorescent silver clusters
Categories
Funding
- STW-NWO Nano
- NSF [NSF-DGE-1144085]
- [NSF-CHE-0848375]
- [NSF-CHE-1213895]
- Direct For Mathematical & Physical Scien [0960331] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1213895] Funding Source: National Science Foundation
- Division Of Materials Research [0960331] Funding Source: National Science Foundation
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We develop approaches to hold fluorescent silver clusters composed of only 10-20 atoms in nanoscale proximity, while retaining the individual structure of each cluster. This is accomplished using DNA clamp assemblies that incorporate a 10 atom silver cluster and a 15 or 16 atom silver cluster. Thermally modulated fluorescence resonance energy transfer (FRET) verifies assembly formation. Comparison to Forster theory, using measured spectral overlaps, indicates that the DNA clamps hold clusters within roughly 5 to 6 nm separations, in the range of the finest resolutions achievable on DNA scaffolds. The absence of spectral shifts in dual-cluster FRET pairs, relative to the individual clusters, shows that select few-atom silver clusters of different sizes are sufficiently stable to retain structural integrity within a single nanoscale DNA construct. The spectral stability of the cluster persists in a FRET pair with an organic dye molecule, in contrast to the blue-shifted emission of the dye.
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