Effects of pH on electrocatalytic activity of carbon nanotubes in polyethylenimine composites

Shieh, Yeong‐Tarng; Yu, Tzu‐Yu; Wang, Tzong-Liu; Yang, Chien‐Hsin

doi:10.1016/j.jelechem.2011.11.005

Cited by 13 publications

(2 citation statements)

References 25 publications

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“…To overcome this problem, different strategies have been used such as dispersion of CNTs in concentrated acid solutions [26,27], organic solvents as N,N′-dimethylformamide [28,29], and polymers such as Nafion [30,31], chitosan [32][33][34], DNA [35], polylysine [36] and polyhistidine [37]. Highly branched polyethylenimine (PEI), a polymeric amine with a high positive charge density [38,39] has been successfully used to increase the level of MWCNT solubility, demonstrating an excellent performance either in batch or in flow systems [22,[40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Development of an electrochemical sensor for the determination of the flavonoid luteolin in peanut hull samples

Tesio¹,

Granero²,

Vettorazzi³

et al. 2014

Microchemical Journal

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Section: Introductionmentioning

confidence: 99%

Development of an electrochemical sensor for the determination of the flavonoid luteolin in peanut hull samples

Tesio¹,

Granero²,

Vettorazzi³

et al. 2014

Microchemical Journal

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“…To develop a highly sensitive sensor, carbon nanotubes (CNT) that reportedly exhibited electrocatalytic activity in several polymers [12][13][14][15][16][17][18][19][20] were incorporated in the SPAN to investigate whether CNT and SPAN can have synergistic effects on the electrocatalytic activity. Therefore, electrochemical copolymerizations on ITO electrode of aniline (AN) and o-aminobenzene sulfonic acid (OSA) with mole ratio of 25/75 in the presence of carbon nanotubes (CNT) and acid-treated CNT (fCNT) were conducted in this study to investigate the electrocatalytic effects of the nanotubes on the copolymerizations.…”

mentioning

confidence: 99%

Electrocatalytic Behavior of Carbon Nanotubes in Electropolymerizations of Self-Doped Polyaniline Used as a Sensing Material

Shieh

Jung

Lin

et al. 2012

J. Electrochem. Soc.

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Electrochemically oxidative copolymerizations on indium tin oxide electrode of aniline (AN) and o-aminobenzene sulfonic acid (OSA) with mole ratio of 25/75 in the presence of carbon nanotubes (CNT) and acid-treated CNT (fCNT) were conducted to investigate the electrocatalytic effects of the nanotubes on the copolymerizations. The P(25AN-co-75OSA)/CNT and P(25AN-co-75OSA)/fCNT composites were subsequently investigated into their electrocatalytic activities to the redox reactions of Fe(CN) 63−/4− as a probe in aqueous solutions of different pH and detection capacities for dopamine (DA) and ascorbic acid (AA) by cyclic voltammetry. The results revealed that CNT and fCNT both electrocatalyzed the oxidations during the copolymerizations of P(25AN-co-75OSA), with CNT having a higher electrocatalytic capacity than fCNT. The so-prepared composites exhibited electrocatalytic activity for the redox reactions of Fe(CN) 6 3−/4− in solutions of up to pH 7, with fCNT having a higher electrocatalytic activity than CNT. The P(25AN-co-75OSA)/fCNT composite film was able to detect DA and AA, exhibiting diffusion-controlled electron transfer rate.

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Electrochemical Investigation of pH‐Dependent Activity of Polyethylenimine‐Capped Silver Nanoparticles

2017

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The pH‐dependent electroanalytical behavior and catalytic activity of branched polyethylenimine‐capped silver nanoparticles (PEI‐AgNPs) were studied by using nanoparticle collision electrochemistry, linear sweep voltammetry, and UV/Vis spectroscopy. The electrochemical collision signals respond rapidly to pH‐induced protonation of the PEI chain at the AgNP surface. This method allows for screening and catalytic activity evaluation of PEI‐AgNPs for the decomposition of organic dyes, demonstrated in this work with methylene blue. Higher oxidation of PEI‐AgNPs was observed at neutral and basic pH, when the particles are stabilized by the PEI chain. Cumulatively, these results indicate that NP collision electrochemistry can be used in addition to spectroscopy and microscopy for studying the effect of the capping agent on the electrochemical behavior of AgNPs and evaluating the relationship between the surface properties and catalytic activity. These measurements provide fundamental information about how surface characteristics, environment, and capping ligands affect NP properties and activity.

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Effects of pH on electrocatalytic activity of carbon nanotubes in polyethylenimine composites

Cited by 13 publications

References 25 publications

Development of an electrochemical sensor for the determination of the flavonoid luteolin in peanut hull samples

Development of an electrochemical sensor for the determination of the flavonoid luteolin in peanut hull samples

Electrocatalytic Behavior of Carbon Nanotubes in Electropolymerizations of Self-Doped Polyaniline Used as a Sensing Material

Electrochemical Investigation of pH‐Dependent Activity of Polyethylenimine‐Capped Silver Nanoparticles

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