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Single Nanoparticle Voltammetry: Contact Modulation of the Mediated Current
Author(s) -
Li Xiuting,
BatchelorMcAuley Christopher,
Whitby Samuel A. I.,
Tschulik Kristina,
Shao Lidong,
Compton Richard G.
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201509017
Subject(s) - carbon nanotube , materials science , current (fluid) , electrode , cyclic voltammetry , diffusion , electrochemistry , nanoparticle , modulation (music) , nanotechnology , electrical contacts , faradaic current , voltammetry , phase (matter) , analytical chemistry (journal) , optoelectronics , chemistry , electrode potential , chromatography , thermodynamics , organic chemistry , philosophy , physics , aesthetics
The cyclic voltammetric responses of individual palladium‐coated carbon nanotubes are reported. Upon impact—from the solution phase—with the electrified interface, the nanoparticles act as individual nanoelectrodes catalyzing the hydrogen‐oxidation reaction. At high overpotentials the current is shown to reach a quasi‐steady‐state diffusion limit, allowing determination of the tube length. The electrochemical response of the individual nanotubes also reveals the system to be modulated by the electrical contact between the electrode and carbon nanotube. This modulation presents itself as fluctuations in the recorded Faradaic current.