Improved l-cysteine electrocatalysis through a sequential drop dry technique using multi-walled carbon nanotubes and cobalt tetraaminophthalocyanine conjugates

Nyoni, Stephen; Mugadza, Tawanda; Nyokong, Tebello

doi:10.1016/j.electacta.2013.10.023

Cited by 34 publications

(15 citation statements)

References 21 publications

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“…The LOD of detection for poly-CoTAPc-MWCNT and poly-CoPyPc-MWCNT were found (using the 3σ notation) to be 1.74 × 10 −8 M and 3.55 × 10 −8 M, respectively. These values are well below the LOD observed on monomeric CoTAPc mixed with MWCNT (2.8 × 10 −7 M [11]). Also the LOD for mixed CoPyPc-MWCNTs is less favourable than for poly-CoPyPc (Table 2).…”

Section: Chronoamperometry Studiesmentioning

confidence: 49%

“…The peaks for L-cysteine oxidation on poly-CoTAPc-MWCNT and poly-CoPyPc-MWCNT were observed at approximately 0.40 and 0.55 V, respectively. The potential for the oxidation of L-cysteine in pH 4 buffer on mixed-CoTAPc-MWCNT was reported to be 0.63 V [11] and 0.83 V for mixed-CoPyPc-MWCNTs (Fig. 9b).…”

Section: Rde Kinetic Studies For Electrooxidation Of L-cysteinementioning

confidence: 95%

“…The detection of L-cysteine on adsorbed-CoTAPc-GCE and mixed-CoTAPc-MWCNT-GCE has been reported before [11].…”

Section: Electrode Modificationmentioning

confidence: 97%

“…L-Cysteine was chosen since its high levels are associated with risks of vascular disease among many others [17]; hence, its detection is of importance. The oxidation of Lcysteine on polymerized CoTAPc (without MWCNTs) [4] or on CoTAPc mixed with MWCNTs [11] has been reported. This work shows that polymerizing CoTAPc on MWCNT improves electrocatalytic activity towards detection of Lcysteine.…”

Section: Introductionmentioning

confidence: 98%

“…The CoPc derivatives are the recently reported [10] tetra(4)-(4,6-diaminopyrimidin-2-ylthio) cobalt(II) phthalocyanine (CoPyPc) and the well-known cobalt tetraamino phthalocyanine (CoTAPc). We have reported on the electrocatalytic behavior of CoPyPc or CoTAPc in the presence of MWCNT when the CoPc derivatives and MWCNT are adsorbed onto glassy carbon electrode (GCE) [10,11]. Adsorption is a fast and easy method.…”

Section: Introductionmentioning

confidence: 99%

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Electrode modification using nanocomposites of electropolymerised cobalt phthalocyanines supported on multiwalled carbon nanotubes

Nyoni

Mashazi

Nyokong

2015

J Solid State Electrochem

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A polymer of tetra(4)-(4,6-diaminopyrimidin-2-ylthio) phthalocyaninatocobalt(II) (CoPyPc) has been deposited over a multiwalled carbon nanotube (MWCNT) platform and its electrocatalytic properties investigated side by side with polymerized cobalt tetraamino phthalocyanine (CoTAPc). X-ray photoelectron spectroscopy, scanning electron microscopy and cyclic voltammetry studies were used for characterization of the prepared polymers of cobalt phthalocyanine derivatives and their nanocomposites. L-Cysteine was used as a test analyte for the electrocatalytic activity of the nanocomposites of polymerized cobalt phthalocyanines and multiwalled carbon nanotubes. The electrocatalytic activity of both polymerized cobalt phthalocyanines was found to be superior when polymerization was done on top of MWCNTs compared to bare glassy carbon electrode. A higher sensitivity for L-cysteine detection was obtained on CoTAPc compared to CoPyPc.

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Section: Chronoamperometry Studiesmentioning

confidence: 49%

Section: Rde Kinetic Studies For Electrooxidation Of L-cysteinementioning

confidence: 95%

“…The detection of L-cysteine on adsorbed-CoTAPc-GCE and mixed-CoTAPc-MWCNT-GCE has been reported before [11].…”

Section: Electrode Modificationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Electrode modification using nanocomposites of electropolymerised cobalt phthalocyanines supported on multiwalled carbon nanotubes

Nyoni

Mashazi

Nyokong

2015

J Solid State Electrochem

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Development of a L‐cysteine Sensor Based on Thallium Oxide Coupled Multi‐walled Carbon Nanotube Nanocomposites with Electrochemical Approach

Hussain

Asiri

Uddin

et al. 2022

Chemistry An Asian Journal

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Here, nanocomposites of thallium oxide doped multi‐walled carbon nanotube (Tl2O MWCNT NCs) were prepared by utilizing a wet‐chemical method (WCM) in an alkaline phase at low temperature. Different optical procedures (FTIR: Fourier Transform Infra‐Red Spectroscopy, XRD: Powder X‐ray diffraction, FESEM: Field‐Emission Scanning Electron Microscopy, XEDS: X‐ray Electron Dispersive Spectroscopy, TEM: Tunneling Electron Microscopy, and XPS: X‐ray photoelectron spectroscopy) were used to fully characterize (optical, structural, crystalline, morphological, and elemental etc.) of the prepared Tl2O MWCNT NCs. Modification of the thin‐layer with NCs onto glassy carbon electrode (GCE) is prepared and applied for the selective and sensitive enzyme‐free detection of L‐cysteine by an electrochemical approach. Using a reliable current‐voltage approach, analytical sensing indexes such as sensitivity, LDR, LOD, LOQ, durability, and interference were assessed by fabricated sensor probe (GCE/Tl2O MWCNT NCs/CPM) in selective detection of L‐cysteine at room temperature, whereas nafion was used as conducting polymer matrix (CPM) during the fabrication of GCE with NCs. L‐cysteine calibration plot was found to be linear over an extensive range of concentration. The calibration curve was used to calculate the sensing parameters such as sensitivity (316.46 pAμM−1cm−2), LOD down to (∼18.90±1.89 pM), and LOQ (63.0 pM) of the prepared sensor. The use of a simple WCM to validate the Tl2O.MWCNT NCs is a good approach for developing a NCs‐based sensor for enzyme‐free biomolecule identification and detection in the biomedical and health care fields in a broad scale. This proposed sensor (GCE/Tl2O MWCNT NCs/CPM) is used to detect selective L‐cysteine in real biological samples such as human, mouse, and rabbit serum and found acceptable and satisfactory results.

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Iodine‐Doped Cobalt Phthalocyanine Supported on Multiwalled Carbon Nanotubes for Electrocatalysis of Oxygen Reduction Reaction

2015

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4‐(4,6‐Diaminopyrimidin‐2‐ylthio) phthalocyaninatocobalt(II) (CoPyPc) was iodine doped, and its electrocatalytic properties explored. Physical characterization techniques such as UV‐vis, X‐ray photoelectron, electron paramagnetic resonance and infra‐red spectroscopy were used. Cyclic voltammetry, electrochemical impedance spectroscopy and rotating disk electrode were used for electrochemical characterization of electrodes modified with the prepared phthalocyanine and its nanocomposites. The electrocatalytic effect of a new iodine‐doped cobalt phthalocyanine derivative supported on multiwalled carbon nanotubes was then investigated towards oxygen reduction reaction. The electrocatalytic activity of the iodine‐doped cobalt phthalocyanine was found to be superior in terms of current over the undoped phthalocyanine nanocomposite.

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Improved l-cysteine electrocatalysis through a sequential drop dry technique using multi-walled carbon nanotubes and cobalt tetraaminophthalocyanine conjugates

Cited by 34 publications

References 21 publications

Electrode modification using nanocomposites of electropolymerised cobalt phthalocyanines supported on multiwalled carbon nanotubes

Electrode modification using nanocomposites of electropolymerised cobalt phthalocyanines supported on multiwalled carbon nanotubes

Development of a L‐cysteine Sensor Based on Thallium Oxide Coupled Multi‐walled Carbon Nanotube Nanocomposites with Electrochemical Approach

Iodine‐Doped Cobalt Phthalocyanine Supported on Multiwalled Carbon Nanotubes for Electrocatalysis of Oxygen Reduction Reaction

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