Determination of Anthracene on Ag-Au Alloy Nanoparticles/Overoxidized-Polypyrrole Composite Modified Glassy Carbon Electrodes

Mailu, Stephen N.; Waryo, Tesfaye; Ndangili, Peter M.; Ngece, Fanelwa R.; Baleg, Abd Almonam; Baker, Priscilla; Iwuoha, Emmanuel I.

doi:10.3390/s101009449

Cited by 69 publications

(40 citation statements)

References 28 publications

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“…The figure revealed two peak potentials for the signalling of AN, i. e. 850 mV and 1150 mV. It has previously been reported that AN oxidizes at a potential of 1181 mV . At low concentrations (7–15 nmol/L AN) the first peak potential shifts anodically with increase in AN concentration from 900 mV to 925 mV.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that the electron transfer at the electrode is coupled to the oxidative stripping of AN. On the other hand the peak potential at 1150 mV is invariant with AN concentration, indicating that the electro‐catalytic reaction occurred on a surface‐bound thin film of electroactive G3PPT‐co‐P3HT .…”

Section: Resultsmentioning

confidence: 99%

“…The electro‐activity of anthracene stems from the extensive conjugation resonance stabilization spanning across all three benzene rings of anthracene. Studies involving the electrochemical determination of trace‐level anthracene have been reported . Generally, electroanalysis can be applied to any electroactive compound which is reproducibly adsorbed on electrode surface .…”

Section: Introductionmentioning

confidence: 99%

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Phase Selective Alternating Current Voltammetric Signalling Protocol: Application in Dendritic Co‐polymer Sensor for Anthracene

et al. 2017

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A sensitive anthracene (AN) sensor was developed with a gold electrode modified with a dendritic star‐copolymer film by in situ electrochemical co‐polymerization of generation 3 propylenethiophenoimine and 3‐hexylthiophene. The sensor's {Au/G3PPT‐co‐P3HT: i. e. gold‐generation 3 poly(propylenethiophenoimine)‐co‐poly(3‐hexylthiophene)} analytical response for anthracene was obtained by phase selective alternating current voltammetric (PSACV) signal transduction. An in‐phase angle of 0° yielded the most sensitive stripping signal and produced the best discrimination between the Faradaic and capacitive currents. The PSACV sensor exhibited a linear range (LR) of 3.48–56.4 nmol/L AN and a limit of detection (LOD) of 2.62 nmol/L AN. The LOD is comparable to the value of 4.4 nmol/L AN reported for glassy carbon electrode modified with graphenated polyaniline sensor. The low LOD value suggests that the AN sensor has promise for monitoring compliance to World Health Organisation (WHO) approved limit for polyaromatic hydrocarbons (PAHs) in wastewater (3.93 nmol/L). The Au/G3PPT‐co‐P3HT sensor is not as sensitive as gas chromatography coupled to tandem mass spectrometry (GC‐MS/MS) and reversed‐phase high performance liquid chromatography (RP‐HPLC) methods. However, the advantage of the PSACV signalling protocol is that real sample test results indicate that the sensor can be used for the determination of AN in oil‐polluted wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Selective Alternating Current Voltammetric Signalling Protocol: Application in Dendritic Co‐polymer Sensor for Anthracene

et al. 2017

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“…The Fe(CN) 6 3-/4− redox probe has been employed in different studies as a valuable tool and model system to study and monitor the electrochemical characteristics of surface-modified electrodes. 33 The redox reversibility of this electroactive couple makes it versatile and readily adaptable to test many electrochemical sensor models.…”

Section: Resultsmentioning

confidence: 99%

Engineering of Au/Ag Nanostructures for Enhanced Electrochemical Performance

Navarreto-Lugo

Lim

2018

J. Electrochem. Soc.

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The effect of nanostructuring on the electrochemical activity of a series of Au/Ag electrocatalysts, with and without graphene nanoplatelets (G) as carbon matrix support and β-cyclodextrin as capping agent, was systematically investigated using the ferri/ferrocyanide redox probe. A series of Au/Ag nanostructures with different morphologies were synthesized and characterized using a combination of spectroscopy, electron microscopy, and electroanalytical methods. Evaluation of the cyclic voltammograms obtained from the ferri/ferrocyanide redox probe using electrodes modified with the different Au/Ag nanostructures revealed significant enhancement in peak currents upon using hollow Au/Ag nanobox and porous-hollow Au/Ag nanocage analogs in comparison to conventional solid spherical Au nanoparticles. The observed improvements in electrochemical activities can be attributed to the nanoreactor cage and edge effects in the hollow cubic nanostructures. Moreover, the dispersion of the nanostructures in G and their surface modification with β-cyclodextrin further enhanced their electrochemical performance. The best performing Au/Ag nanostructure that was modified with β-cyclodextrin and G was used to fabricate an electrochemical sensor for the stress biomarker cortisol. The resulting electrochemical sensor exhibited good linear response to cortisol in the concentration range of 1 pM to 100 nM, making it a promising platform technology for monitoring the physiological stress indicator. Nanoparticle based electrochemical sensors have received considerable attention in recent years due to their exceptional attributes including high sensitivity, good reliability, and stability.1-4 Moreover, engineered electrocatalytic nanomaterials provide a means to develop simple-to-contruct 5 electrochemical sensors that can be used for routine point-of-care health monitoring and diagnostics.6,7 However, for most biomedical applications, a next generation sensor platform technology will require significant improvements in the nanomaterials' properties to facilitate lower detection limits and higher sensitivities under lower costs for mass production. 8,9 An effective electrochemical sensor relies heavily on the surface architecture of the working electrode in order to allow the recognition process to occur under short response time, achieve good signal-tonoise (S/N) ratio, and detect the analyte of interest at low limits of detection (LOD) with high selectively.9-11 For these purposes, Au nanoparticles have been heavily explored for their use as modifiers of the electrochemical sensor's interface due to their unique attributes such as high conductivity, 12 stability, 13 ease of enabling surface chemical modifications, 13,14 and their large surface-to-volume ratios. 15,16Moreover, Au nanoparticles are less susceptible to suffer from surface poisoning compared to other commonly used electrocatalytic nanometals. 17 Due to the many promising attributes of Au-based nanostructures, this nanomaterial has become a good scaffold for different electr...

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“…Furthermore, AuNPs provide good catalytic activity, biocompatibility, and large active surface area where enzymes with effectively retained activities can be strongly absorbed. In order to encapsulate both an enzyme and AuNPs, conductive polymers are used as supporting matrices while also act as electron facilitators [6].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Gold Nanoparticles/Polypyrrole/HRP Electrode for Phenol Biosensor by Electropolymerization

Kumpangpet¹,

Jongsomjit²,

Thanachayanont³

et al. 2012

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Abstract.A phenol enzyme biosensor was fabricated in this research using disposable screen-printed carbon electrode modified with gold nanoparticles (AuNPs), polypyrrole (PPy) and immobilized horseradish peroxidase (HRP) by electropolymerization method. The physical and chemical properties of the modified electrode was characterized by scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) while electrochemical analysis was performed with amperometry. The fabrication parameters, gold precursor and enzyme concentrations, were optimized. The obtained results proved that AuNPs/PPy nanocomposite matrix could not only appropriately immobilize HRP, but also retained its bioactivity. Furthermore, the presence of AuNPs provided enhanced electrochemical responses. The proposed method was simple, and effective.

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Determination of Anthracene on Ag-Au Alloy Nanoparticles/Overoxidized-Polypyrrole Composite Modified Glassy Carbon Electrodes

Cited by 69 publications

References 28 publications

Phase Selective Alternating Current Voltammetric Signalling Protocol: Application in Dendritic Co‐polymer Sensor for Anthracene

Phase Selective Alternating Current Voltammetric Signalling Protocol: Application in Dendritic Co‐polymer Sensor for Anthracene

Engineering of Au/Ag Nanostructures for Enhanced Electrochemical Performance

Fabrication of Gold Nanoparticles/Polypyrrole/HRP Electrode for Phenol Biosensor by Electropolymerization

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