Carbon Nanotube Electrodes for Hot‐Wire Electrochemistry

Abstract

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 degrees 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.

Reference values of the chronoamperometric response at cylindrical and capped cylindrical electrodes

“…As h becomes smaller, the electrode approaches the form of a planar protruding disk [2,3] and, at the limit h → 0, it becomes an embedded disk. If h is large compared with a, we have "whiskers" [4]; these are often made from carbon fibres cut with a scalpel [5][6][7][8] or carbon-coated metal wires used for hot-wire electrochemistry [9]. As h → ∞, the capped cylinder approaches an infinite cylinder, which we will simply refer to as a cylinder in the following.…”

Spectro- and thermoelectrochemistry of sexithiophenes in solution

“…A 10 cm long centrifuge tube (internal diameter 13 mm), filled with 5 ml of the solution, was used as thermoelectrochemical cell. The electrode holder was described elsewhere [13] and used in a somewhat modified design. Briefly, the electrode body made of printed board material, at one side contained the working electrode of Pt wire 25 lm in diameter with an exposed length of 17 mm.…”

Participation of the liver gluconeogenesis in the glibenclamide‐induced hypoglycaemia in rats

“…In 1993, the idea of direct electrode heating has been resurrected by the implementation of electrochemical sensors 295–315. Heating frequency of 100 kHz proved to be useful for all purposes.…”

“…Heated gold wires carrying a self assembled monolayer have been investigated for their temperature dependence 333. Recently, a useful preparation procedure for making nanotube‐covered microwires has been proposed 315…”