Journal ArticleDOI
Chemically modified electrode based on poly[tetra(4-aminophenyl)porphyrin] as a pH sensor
TLDR
A chemically modified platinum electrode with coated poly[tetra(4-aminophenyl)porphyrin] has been used as a potentiometric pH sensor that gives a linear response over the pH range 1.5-13.7 with a slope of 55 mV/pH.About:
This article is published in Talanta.The article was published on 1993-08-01. It has received 27 citations till now. The article focuses on the topics: Potentiometric titration & Chemically modified electrode.read more
Citations
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Journal ArticleDOI
Solid-state pH nanoelectrode based on polyaniline thin film electrodeposited onto ion-beam etched carbon fiber
TL;DR: An ultramicro pH sensor based on a thin polyaniline film that was electrochemically deposited onto a carbon fiber nanometer-size electrode was constructed in this article, which demonstrated high ion selectivity with respect to K +, Na +, Ca 2+, and Li +, with log K H,M values around −12 and has a working lifetime of about 20 days.
Journal ArticleDOI
meso-Tetraarylporpholactones as high pH sensors.
Gamal Khalil,Pedro Daddario,Kimberly S. F. Lau,Kimberly S. F. Lau,Sayed Imtiaz,Michelle King,Martin Gouterman,Alexey Sidelev,Narissa Puran,Masoud Ghandehari,Christian Brückner +10 more
TL;DR: The molecular origin of this optical shift is deduced to be a nucleophilic attack of OH(-)/MeO(-) on the lactone carbonyl of the chromophore, representing a novel mechanism for porphyrin-based sensors.
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Solid-state pH ultramicrosensor based on a tungstic oxide film fabricated on a tungsten nanoelectrode and its application to the study of endothelial cells
Katsunobu Yamamoto,Guoyue Shi,Tianshu Zhou,Fan Xu,Min Zhu,Min Liu,Takeshi Kato,Jiye Jin,Litong Jin +8 more
TL;DR: In this article, a pH ultramicrosensor was fabricated by producing WO 3 at W nanoelectrode surface by electrooxidation in 2.0 mol/l H 2 SO 4 solution.
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Optical pH Meter by Means of a Porphyrin Monolayer Covalently Assembled on a Molecularly Engineered Silica Surface
TL;DR: In this article, the evolution of the UV−vis absorbance spectra of a porphyrin covalently assembled monolayer, upon immersion in increasing [H3O+] solutions, showed the disappearing of the Soret band and the progressive increase of a new band.
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Electropolymerization of Tetrakis(o‐aminophenyl)porphyrin and Relevant Transition Metal Complexes from Aqueous Solution. The Resulting Modified Electrodes as Potentiometric Sensors
Abstract: The mechanism of electrogeneration of polyporphyrin from ortho-substituted phenylporphyrins, either free or complexing transition metals, is different when performed in aqueous solution from that operative in organic solvents, that has been reported in the literature Polymerization occurs through the amino phenyl substituents, leading to a three dimensional ‘cage’ structure The polymer is sensitive to morphology and nature of the surface it grows on The mass deposited on a gold electrode was about 2 × 10–4 g/cm2 If the polymerization is performed under potentiodynamic conditions, the polymer forms essentially during the first scan, while no significant further growth is observed in subsequent potential cycles, from both free and metallated porphyrins All polyporphyrin films, except the one obtained from CoTAPP, exhibit poor electrical conductivity, due to the three dimensional growth of the polymer chain that does not allow the necessary conjugation of π orbitals inside the macromolecules On the other hand, interesting properties are shown by the unmetallated as well as by metallated polymer films as possible coverages for ‘coated wire’ ion selective electrodes The results obtained with respect to different ions and, in particular, a selectivity study carried out on iodide ions are reported
References
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Potent catalysis of the electroreduction of oxygen to water by dicobalt porphyrin dimers adsorbed on graphite electrodes
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Permselectivity of films prepared by electrochemical oxidation of phenol and amino-aromatic compounds
TL;DR: In this paper, a selective permeability of polymers derived by electrochemical polymerization from phenol and amino-aromatic compounds to the various oxidation-reduction species dissolved in the solution was investigated by means of hydrodynamic voltammetry at a rotating disk electrode.
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A hydrogen ion-selective liquid-membrane electrode based on tri-n-dodecylamine as neutral carrier
TL;DR: An electrically neutral hydrogen ion-selective carrier, tri-n-dodecylamine, was used as the active component for liquid-membrane electrodes as mentioned in this paper.