Electrocatalytic behahiour of cobalt tetraamino-phthalocyanine in the presence of a composite of reduced graphene nanosheets and of multi-walled carbon nanotubes

Nyoni, Stephen; Nyokong, Tebello

doi:10.1016/j.electacta.2014.05.093

Cited by 16 publications

(6 citation statements)

References 32 publications

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“…The black solid product was obtained by filtration over a fritted glass funnel, washed with copious amount of water (5×50 mL), and dried in an oven at 70 °C. The resulting sample was further treated with 98 % H 2 SO 4 and is designated as rGNS, as reported before 38.…”

Section: Methodsmentioning

confidence: 99%

Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

et al. 2014

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A facial strategy is developed to fabricate a three-dimensional (3D) Fe3 O4 nanorod array/graphene architecture, in which Fe3 O4 nanorods with a length and diameter of about 600 and 100 nm, respectively, are grown on both surfaces of the graphene sheets. The measured electromagnetic parameters show that the 3D architecture exhibits excellent electromagnetic wave-absorption properties, that is, more than 99 % of electromagnetic wave energy can be attenuated by the 3D architecture if it is added in only 20 wt % of the paraffin matrix, as the thickness of the absorber is in the range from 2.38 to 5.00 mm. The analysis of the electromagnetic (EM) absorption mechanism reveals that the excellent EM absorption properties are related to the special 3D architecture, and therefore, the construction of graphene-based 3D heteronanostructures is effective in obtaining lightweight EM absorbers with strong absorption properties.

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Section: Methodsmentioning

confidence: 99%

Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

et al. 2014

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“…The combination of the two electrocatalysts: nanosized phthalocyanines and SDGONS is expected to improve electrocatalytic activity. We have recently shown that the combination of phthalocyanines and un‐doped GONS show improved electrocatalytic behaviour . There is only one study involving doped (N) GONS for electrocatalysis of hydrogen peroxide.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Activity of Nanocomposites of Sulphur Doped Graphene Oxide and Nanosized Cobalt Phthalocyanines

Shumba

Nyokong

2016

Electroanalysis

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In this work we explore the electrocatalytic activity of nanocomposites of reduced sulphur doped graphene oxide nanosheets (rSDGONS) and cobalt phthalocyanine (CoPc) or cobalt tetra amino phthalocyanine (CoTAPc) towards hydrogen peroxide. Transmission electron microscopy, scanning electron microscopy, X‐ray photon spectroscopy, X‐ray diffraction, chronoamperometry, linear scan voltammetry and cyclic voltammetry were used to characterize the nanocomposites. Nanosized CoPc showed superior (in terms of currents) electrocatalytic oxidation and reduction of hydrogen peroxide compared to CoTAPc nanoparticles (CoTAPcNP). The lowest detection limit was obtained for hydrogen peroxide oxidation on electrodes modified with CoPcNP‐rSDGONS at 1.49 µM. The same electrode gave a high adsorption equilibrium constant of 1.27×103 mol−1 and a Gibbs free energy of −17.71 kJ/mol, indicative of a spontaneous reaction on the electrode surface.

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“…In some studies, carbon nanotubes are first covalently or noncovalently functionalized with phthalocyanines, and then the resulting hybrids are used to modify the electrode surface, [43,119] while in most cases, the electrodes are first modified with carbon nanotubes, and then the MPc solution is dropped on the top of the carbon layer, followed by drying [120,121] or the electrode is immersed in the MPc solution. [122] These methods are called "drop dry" or "dip dry" and are based on simple intermolecular forces, viz.…”

Section: Hybrid Materials Based On Carbon Nanotubes and Metal Phthalo...mentioning

confidence: 99%

Hybrid Materials Based on Carbon Nanotubes and Polyaromatic Molecules: Methods of Functionalization and Sensor Properties

Basova¹,

Polyakov²

2020

MHC

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One of the most relevant ways to improve selectivity of sensors based on carbon nanotubes (CNT) is to create hybrid materials with polyaromatic molecules. The interest in hybrid materials is related to the synergistic effect that occurs when the properties of carbon nanomaterials (their one-dimensional electronic structure, high conductivity, large surface area) and properties of polyaromatic molecules (high sensitivity to analytes of different nature, reversibility of the sensor response) are combined. The creation of new porous three-dimensional carbon structures, in which polyaromatic molecules are linkers, is also of interest for creating functional carbon materials of a new generation. This review analyzes the current state of research in the field of hybrid materials based on carbon nanotubes and various polyaromatic molecules (derivatives of phthalocyanine, porphyrin, pyrene, coumarin, BODIPY, etc.) related to the problems of improving the sensitivity and selectivity of chemiresistive and electrochemical sensors. The first part of the review presents an analysis of works that describe various methods of functionalization of carbon nanotubes with aromatic molecules, and examines their influence on the composition and structure of the resulting materials, as well as approaches to creating hybrid 3D structures based on CNTs. The second part of the review is devoted to the functional properties of hybrid materials with the main focus on the analysis of their sensor properties. Examples of the most successful application of hybrid materials as active layers of chemiresistive sensors for determining various gases in the environment are given. When considering the literature data, the main attention is paid to the analysis of the influence of methods of CNT functionalization with polyaromatic molecules on sensor properties. The third part of the review is devoted to the use of hybrid materials for the modification of electrodes of electrochemical sensors for the determination of various molecules in aqueous solutions and biological media.

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Electrocatalytic behahiour of cobalt tetraamino-phthalocyanine in the presence of a composite of reduced graphene nanosheets and of multi-walled carbon nanotubes

Cited by 16 publications

References 32 publications

Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Electrocatalytic Activity of Nanocomposites of Sulphur Doped Graphene Oxide and Nanosized Cobalt Phthalocyanines

Hybrid Materials Based on Carbon Nanotubes and Polyaromatic Molecules: Methods of Functionalization and Sensor Properties

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Electrocatalytic behahiour of cobalt tetraamino-phthalocyanine in the presence of a composite of reduced graphene nanosheets and of multi-walled carbon nanotubes

Cited by 16 publications

References 32 publications

Growth of Fe3O4 Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Growth of Fe3O4 Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Electrocatalytic Activity of Nanocomposites of Sulphur Doped Graphene Oxide and Nanosized Cobalt Phthalocyanines

Hybrid Materials Based on Carbon Nanotubes and Polyaromatic Molecules: Methods of Functionalization and Sensor Properties

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Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields

Growth of Fe₃O₄ Nanorod Arrays on Graphene Sheets for Application in Electromagnetic Absorption Fields