Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method

Jayaprakash, Gururaj Kudur; Swamy, B.E. Kumara; Casillas, Norberto; Flores‐Moreno, Roberto

doi:10.1016/j.electacta.2017.11.154

Cited by 49 publications

(25 citation statements)

References 59 publications

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“…In polymer films, and more specifically chitosan films, the width of the electrochemical peaks in CVs increases and the current sensitivity toward analytes in the film decreases (Sisolakova et al, 2019 ). The position of the reduction and oxidation peaks shifts to higher energies relative to analyte in dispersion, owing to the hydrophobic regions of the polymer matrix interacting with the solution and complexing with analytes (Jayaprakash et al, 2017 ). Despite these matrix effects when using chitosan, analytical responses typically improve for analyte detection and electrochemical stability improves for films, all relative to solution.…”

Section: Resultsmentioning

confidence: 99%

Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films

et al. 2020

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Carbon quantum dots (CQDs) were manufactured from citric acid and urea in a gram-scale synthesis with a controlled size range between 1. 5 and 23.8 nm. The size control was realized by varying volume of the precursor solution in a hydrothermal synthesis method. The prepared CQDs were investigated using electrochemiluminescence (ECL) spectroscopy at interfaces of their electrode films and electrolyte solution containing coreactants rather than conventional optoelectronic tests, providing an in-depth analysis of light-emission mechanisms of the so-called half-cells. ECL from the CQD films with TPrA and K 2 S 2 O 8 as coreactants provided information on the stability of the CQD radicals in the films. It was discovered that CQD •− has a powerful electron donating nature to sulfate radical to generate ECL at a relative efficiency of 96% to the Ru(bpy) 3 Cl 2 /K 2 S 2 O 8 coreactant system, indicating a strong performance in light emitting applications. The smaller the CQD particle sizes, the higher the ECL efficiency of the film interface, most likely due to the increased presence of surface states per mass of CQDs. Spooling ECL spectroscopy of the system revealed a potential-dependent light emission starting from a deep red color to blue-shifted intensity maximum, cool bright white emission with a correlated color temperature of 3,200 K. This color temperature is appropriate for most indoor lighting applications. The above ECL results provide information on the performance of CQD light emitters in films, permitting preliminary screening for light emitting candidates in optoelectronic applications. This screening has revealed CQD films as a powerful and cost-effective light emitting layer toward lighting devices for indoor applications.

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Section: Resultsmentioning

confidence: 99%

Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films

et al. 2020

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“…have already been reported. Modification of a sensing electrode is usually performed to improve the sensing properties of electrode [28][29][30][31][32][33][34][35].…”

Section: A D V a N C E D O N L I N E A R T I C L Ementioning

confidence: 99%

Poly (DL-valine) electro-polymerized carbon nanotube paste sensor for determination of antihistamine drug cetirizine

Tigari

Manjunatha

Pushpanjali

et al. 2020

J. Electrochem. Sci. Eng.

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Poly (DL-valine) modified multiwalled carbon nanotube paste sensor (PVLMCNTPS) was prepared by electro-polymerization route. PVLMCNTPS and bare multiwalled carbon nanotube paste sensor (BMCNTPS) morphologies and sensing properties for cetirizine (CTZ) were confirmed through a field emission scanning electron microscope (FE-SEM) and electrochemical studies, respectively. In contrast to BMCNTPS, PVLMCNTPS surface composite creates an electrocatalytic impact on the oxidation of CTZ. PVLMCNTPS properties were optimized using parameters such as accumulation time, number of polymerization cycles, solution pH, and scan rate. The optimized PVLMCNTPS was applied for the determination of cetirizine in 0.1 M phosphate buffer solution (PBS) of pH 7.0, using cyclic voltammetry (CV). It is shown that PVLMCNTPS provided analytical linearity from 2.0 to 80 µM, with a detection limit of 0.11 µM for CTZ determination. PVLMCNTPS is found highly selective for CTZ in presence of some interfering organic molecules. The stable and selective PVLMCNTPS was applied for CTZ determination in pharmaceutical pills with satisfactory results.

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“…These maps allow us to visualize the charged regions of the methionine molecule. Knowledge of the charge distributions can be used to determine how the molecules interact with one another [29,[39][40][41]. Figure 3c is one of the electrostatic potential energy maps that show the electron distributions obtained using the Gaussian09 program.…”

Section: Theoretical Studies Of Methioninementioning

confidence: 99%

“…The use of a glassy carbon electrode modified with methionine and graphene in the determination of tryptophan in milk has been reported [27]. Furthermore, glassy carbon electrodes with poly(methionine) showed benefits in the simultaneous determination of pyrazinamide and amlodipine in urine and blood plasma [28,29]. A methionine-modified electrode was found to exhibit an excellent catalytic property towards the determination of amlodipine in human biological fluids.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have demonstrated that layers of the amino acids coating the surface of a carbon electrode act like an electron transfer mediator, which increases the sensing abilities of the electrode [28]. Previously, the density functional theory (DFT)-based quantum chemical model has been used to explain the mediating behaviors of modifiers [2,22,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

Chandrashekar

Jayaprakash

et al. 2019

Chemosensors

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Fabrication of biocompatible electrodes for the investigation of catecholamines is a known challenge. In this work, methionine was chosen as a modifier for fabrication of a biocompatible carbon paste electrode by electropolymerization, through cyclic voltammetry. The electrochemical behavior of the poly(methionine) modified carbon paste electrode was characterized by cyclic voltammetry for simultaneous determination of dopamine (DA) and uric acid (UA) in a phosphate-buffered solution at pH 7.0. In the absence of an amino acid methionine layer, the bare carbon paste electrode exhibits rather poor voltammetric signals in DA and UA in the binary mixture, with oxidation potentials of DA and UA overlapping with each other. The poly(methionine) modified carbon paste electrode exhibits good catalytic activity with noticeably different oxidation potentials of DA and UA. The experimental results closely agree with the theoretical prediction based on a Fukui function complementary to the simulated electrostatic potential maps.

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Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method

Cited by 49 publications

References 59 publications

Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films

Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films

Poly (DL-valine) electro-polymerized carbon nanotube paste sensor for determination of antihistamine drug cetirizine

Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

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