Fluorescence Electrochemical Microscopy: Capping Agent Effects with Ethidium Bromide/DNA Capped Silver Nanoparticles

Fluorescence microscopy and electrochemistry were employed to examine capping agent dynamics in silver nanoparticles capped with DNA intercalated with ethidium bromide, a fluorescent molecule. The capped NPs were studied first electrochemically, demonstrating that the intercalation of the capping ag...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2017-10, Vol.56 (41), p.12751-12754
Main Authors: Tanner, Eden E. L., Sokolov, Stanislav V., Young, Neil P., Batchelor‐McAuley, Christopher, Compton, Richard G.
Format: Article
Language:English
Subjects:
Capping
Deoxyribonucleic acid
DNA
Electrochemistry
Electron transfer
Ethidium bromide
Fluorescence
Fluorescence microscopy
Microscopy
Nanoparticles
Oxidation
Silver
silver nanoparticles
single nanoparticle electrochemistry
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Summary:Fluorescence microscopy and electrochemistry were employed to examine capping agent dynamics in silver nanoparticles capped with DNA intercalated with ethidium bromide, a fluorescent molecule. The capped NPs were studied first electrochemically, demonstrating that the intercalation of the capping agent promotes oxidation of the silver core, occurring at 0.50 V (vs. Ag, compared with 1.15 V for Ag NPs capped in DNA alone). Second, fluorescence electrochemical microscopy revealed that the electron transfer from the nanoparticles is gated by the capping agent, allowing dynamic insights unobservable using electrochemistry alone. Undercover investigation: Fluorescence electrochemical microscopy has been used to examine capping agent effects of intercalated ethidium bromide/DNA‐capped silver nanoparticles, allowing insight into the role the capping agent plays in electron transfer from the nanoparticle.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201707809