Journal
CHEMPHYSCHEM
Volume 9, Issue 7, Pages 1053-1056Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200700863
Keywords
bioconjugation; molecular electronics; nanotubes; oxidation; single-molecule studies
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Real-time monitoring of carbon nanotube conductance during electrochemical and chemical etching reveals the electronic signatures of individual bond alteration events on the nanotube sidewall. Tracking the conductance of multiple single-molecule experiments through different synthetic protocols supports putative mechanisms for sidewall derivatization. Insights gained from these mechanistic observations imply the formation of sidewall carboxylates, which are useful as handles for bioconjugation. We describe an electronic state required for efficacious chemical treatment. Such real-time monitoring can improve carboxylate yields to 45% or more. The experiments illustrate the power of molecular nanocircuits to uncover and direct the mechanisms of chemical reactions.
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