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Carbon Nanotube Electrodes for Hot‐Wire Electrochemistry
Author(s) -
Gründler Peter,
Frank Otakar,
Kavan Ladislav,
Dunsch Lothar
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800659
Subject(s) - carbon nanotube , ferrocene , electrode , electrochemistry , cyclic voltammetry , materials science , raman spectroscopy , nanotube , chemically modified electrode , chemical engineering , inorganic chemistry , nanotechnology , chemistry , working electrode , physics , engineering , optics
Hot‐wired electrodes : Thin metallic wires ( d =25 μm) are covered with a 3 μm layer of single‐walled carbon nanotubes (SWCNTs; see image) by electrophoresis from a suspension containing excess ionic surfactant. A pure SWCNT surface is achieved by heating the electrode in air. Strong differences between covered and bare metallic electrodes occur with in situ heating during electrochemical experiments.The use and preparation of single‐walled carbon nanotubes (SWCNTs) at thin metallic wire electrodes for hot‐wire electrochemical studies is described. The nanotubes were deposited on metal substrates such as gold by electrophoresis from a dispersion containing sodium dodecyl sulphate as an anionic surfactant. The formation of a layer of pure SWCNTs is achieved by thermal treatment at 350 °C. When heated in situ by a strong ac current, the electrodes can be used for electrochemical studies of nanotubes at increased temperatures. The state and functionality of the electrodes were characterized by Raman spectroscopy, scanning electron microscopy, and cyclic voltammetry with both anionic and cationic redox systems (dopamine, ferrocene carboxylic acid). First time experiments at the heated SWCNT electrodes demonstrated an excellent suitability of these as‐prepared electrodes for thermoelectrochemical studies.