Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 7, Pages 1148-1155Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz4000142
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Funding
- NIH [R01 GM086195]
- National Science Foundation [CBET-0853692, CHE-0922834, CHE-0718588]
- Regional NSF-REU Site in Chemistry at Furman University
- National Institutes of Health [R15GM071370]
- Henry Dreyfus Teacher-Scholar Awards Program
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0853692] Funding Source: National Science Foundation
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Conductive and plasmon-supporting noble metals exhibit an especially wide range of size-dependent properties, with discrete electronic levels, strong optical absorption, and efficient radiative relaxation dominating optical behavior at the similar to 10-atom cluster scale. In this Perspective, we describe the formation and stabilization of silver clusters using DNA templates and highlight the distinct spectroscopic and photophysical properties of the resulting hybrid fluorophores. Strong visible-to-near-IR emission from DNA-encapsulated silver clusters ranging in size from 5 to 11 atoms has been produced and characterized. Importantly, this strong Ag cluster fluorescence can be directly modulated and selectively recovered by optically controlling the dark state residence, even when faced with an overwhelming background. The strength and sequence sensitivity of the oligonucleotide-Ag interaction suggests strategies for fine-tuning and stabilizing cluster-based emitters in a host of sensing and biolabeling applications that would benefit from brighter, more photostable, and quantifiable emitters in high background environments.
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