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Gold Nanorod Enhanced Fluorescence Enables Single‐Molecule Electrochemistry of Methylene Blue
Author(s) -
Zhang Weichun,
Caldarola Martín,
Pradhan Biswajit,
Orrit Michel
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201612389
Subject(s) - methylene blue , fluorescence , redox , electrochemistry , nanorod , chemistry , photochemistry , molecule , quantum yield , nanotechnology , inorganic chemistry , materials science , electrode , organic chemistry , catalysis , physics , quantum mechanics , photocatalysis
Redox reactions are central to energy conversion and life metabolism. Herein we present electrochemical measurements with fluorescent readout of the redox‐sensitive dye Methylene Blue (MB), at the single‐molecule (SM) level. To overcome the low fluorescence quantum yield of MB we enhanced fluorescence by using individual gold nanorods to achieve the required sensitivity. By measuring the same molecule at different electrochemical potentials we determined the mid‐point potential of each single molecule through its redox‐induced fluorescence blinking dynamics.