Functionalization of multi-walled carbon nanotube for electrocatalytic oxidation of nitric oxide

Abstract

The multi-walled carbon nanotube (MWCNT) was functionalized with hydroxyl, carboxyl and amido groups on the surface. Electrocatalytic oxidation of nitric oxide (NO) at the MWCNT modified electrodes was investigated. It was found that the MWCNT modified electrode could speed up greatly the electron transfer rate compared with the glass carbon electrode, and there was an adsorptive step for the oxidation of NO at the MWCNT modified electrode. The activation energy of NO electrooxidation reaction at modified electrode of MWCNT treated by alkali and mixed acids (MWCNT-OH-COOH) decreased, and current density was almost two times that of the electrode modified with alkali treated MWCNT. The modified electrodes of MWCNT amidated with the aliphatic amines decreased the activation energy of NO oxidation compared with MWCNT modified electrode, but the reaction rate of amidated MWCNT electrodes decreased because of the steric effect. The results demonstrated that MWCNT-OH-COOH modified electrode is the best for NO electrocatalytic oxidation.

Nanomaterials-based electrochemical sensors for nitric oxide

“…Kan et al [74] compared the electrocatalytic activity of MWCNTs functionalized with hydroxyl, carboxyl and amido groups on the electrode surface. The results showed that the activation energy of NO electrooxidation reaction decreased and the current density was the highest at modified electrode of MWCNTs treated by alkali and mixed acids.…”

Enhancement of thermal stability of multiwalled carbon nanotubes via different silanization routes

“…Recently, CNTs were intentionally modified in order to perform an exact role in certain applications in such fields as metal and polymer composites [1][2][3][4][5][6][7], electrodes [8][9][10][11] or sensors [12,13]. Modern modifications of multiwalled carbon nanotubes (MWCNTs) involve single to several steps of the external walls modification, called exohedral functionalization, which depends on further applications of the prepared material [2,[14][15][16][17][18]. The oxidation process is the simplest and most common single-step of the outer wall functionalization, leading to the introduction of the functional groups on their outer walls, which can be used as a linkers for further more sophisticated modifications [19][20][21][22][23].…”

Nitric Oxide Sensing through Azo-Dye Formation on Carbon Dots

“…In addition, synthesis of the organic molecule was complex. Nanoparticle-based NO detection schemes have also been reported, employing, for example, single-and multiwalled carbon nanotubes, − reduced graphene oxide, gold nanoparticles, and inorganic quantum dots . These NO sensing strategies, however, have had limited applicability in biological systems, exhibit long reaction times, low sensitivity, or requiring complex synthesis routes.…”