Comparative electrocatalytic studies of nanocomposites of mixed and covalently linked multiwalled carbon nanotubes and 4-(4,6-diaminopyrimidin-2-ylthio) phthalocyaninato cobalt(II)

Nyoni, Stephen; Nyokong, Tebello

doi:10.1016/j.poly.2015.05.038

Cited by 2 publications

(2 citation statements)

References 39 publications

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“…21,26 The modification of multiwalled CNTs (MWCNTs) has been especially focused, compared with the single-walled ones, as the intensive functionalization on the outer surface of CNTs may not affect the fast electron transfer through the inner graphitic walls. 25,27,28 The collision behaviors of catalytic molecule-modified NPs can be used to analyze the intrinsic activity at a single molecule level. For example, the electrochemical collision of goldmodified catechol molecule at the carbon fiber ultramicroelectrode (C UME) surface for electrocatalytic oxidation of NADH has been previously studied.…”

Section: Introductionmentioning

confidence: 99%

“…Carbonaceous nanomaterials, especially the surface-modified carbon nanotubes, have been increasingly applied for electroanalytical chemistry recently because of their exceptional electrical, optical, thermal, mechanical, and chemical properties, as well as the flexibility to be associated with numerous chemical compounds to form new nanocomposites. − Moreover, because the pristine CNTs are insoluble in most aqueous solutions and certain organic solvents, it is also essential to conduct surface modification to improve their solubility . The biomolecule-tethered CNTs nanocomposites have been previously reported for electrocatalysis, biomedical imaging, drug delivery, and photocatalysis. , The modification of multiwalled CNTs (MWCNTs) has been especially focused, compared with the single-walled ones, as the intensive functionalization on the outer surface of CNTs may not affect the fast electron transfer through the inner graphitic walls. ,, …”

Section: Introductionmentioning

confidence: 99%

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Individual Modified Carbon Nanotube Collision for Electrocatalytic Oxidation of Hydrazine in Aqueous Solution

Patrice

Qiu

Zhao

et al. 2018

ACS Appl. Nano Mater.

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Collision at a single molecule level was achieved based on the nanoimpact of an individual pyrroloquinoline quinone (PQQ) modified multiwalled carbon nanotube (MWCNT) at the carbon fiber ultramicroelectrode (C UME). Electrocatalytic amplification of the current responses was observed when the PQQ-modified MWCNT collided with C UME in the presence of hydrazine (N2H4) in a Tris-HCl buffer solution, which was also supported by the conventional cyclic voltammetry and chronoamperometry techniques. The enhanced catalytic oxidation of N2H4 was due to the “addition-elimination” redox cycling mechanism of PQQ/PQQH2, where the oxidation of N2H4 occurred together with the reduction of PQQ under an external bias, and the formed PQQH2 intermediate would be reoxidized back to PQQ simultaneously. The average collision current, duration, and charge for PQQ-modified MWCNT at 1.0 V vs Ag/AgCl were 105 pA, 0.45 ms, and 49 fC, respectively. As a result, the turnover frequency of electrocatalytic oxidation of N2H4 by PQQ was calculated to be 54 s–1. In this regard, the proposed individual carbon nanotube collision method can not only serve as a promising sensing technique to detect biochemical species, but more importantly provide a robust approach to determine the intrinsic catalytic activity as well.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Individual Modified Carbon Nanotube Collision for Electrocatalytic Oxidation of Hydrazine in Aqueous Solution

Patrice

Qiu

Zhao

et al. 2018

ACS Appl. Nano Mater.

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Electrocatalytic performance of a nickel(II) phthalocyanine-carbon nanotube composite towards the detection of Hg2+ ions

Ngwenya,

Nelson,

Rhyman

et al. 2024

J Appl Electrochem

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A composite film of Ni(II) phthalocyanine bearing four benzothiazole (bs) substituents (2) and carboxylic-functionalised multi-walled carbon nanotubes (2-f-MWCNTs) was drop cast on an Au electrode and heated at 50 °C to form a new Au|2-f-MWCNTs sensor for detection of Hg(II) ions. The redox potentials of 2 were measured by cyclic voltammetry, and the processes were affirmed spectroelectrochemically. The nanocomposite of the 2-f-MWCNTs was characterised by Fourier transform Infrared and Raman spectroscopies, and Scanning electron Microscopy. Its electrocatalysis towards Hg(II) was probed by various voltammetric techniques showing higher Faradaic currents in standard redox solutions than the bare or SAMs of 2. Anodic stripping voltammgrams of Hg2+ ions at the Au|2-f-MWCNTs showed good electrocatalytic activity with a linear range spanning 14.4 μM and 1000 μM, and a precision of ± 4.2%. Electrode selectively detected Hg2+ ions in the presence of Pb2+ and Zn2+ ions, while its SWV scan for a mixture of Hg2+ and Cd2+ showed high background noise. Graphic abstract

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Comparative electrocatalytic studies of nanocomposites of mixed and covalently linked multiwalled carbon nanotubes and 4-(4,6-diaminopyrimidin-2-ylthio) phthalocyaninato cobalt(II)

Cited by 2 publications

References 39 publications

Individual Modified Carbon Nanotube Collision for Electrocatalytic Oxidation of Hydrazine in Aqueous Solution

Individual Modified Carbon Nanotube Collision for Electrocatalytic Oxidation of Hydrazine in Aqueous Solution

Electrocatalytic performance of a nickel(II) phthalocyanine-carbon nanotube composite towards the detection of Hg2+ ions

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