Tailoring polythiophene cation-selective optodes for wide pH range sensing

Stelmach, Emilia; Kaczmarczyk, Brian; Maksymiuk, Krzysztof; Michalska, Agata

doi:10.1016/j.talanta.2019.120663

Cited by 20 publications

(24 citation statements)

References 31 publications

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“…(ii) In consequence, effects related to interactions between POT and the ionophore/ion exchanger are controlled, too. 21 (iii) A composite membrane with particulates of POT dispersed within the plasticized PVC matrix seems to be an attractive alternative also to assure a larger contact area between the conducting polymer and ion-selective membrane, which is proven as an important factor for sensors operating under coulometric conditions. 22 We propose an emission readout of ion-selective sensors operating under non-zero-current conditions benefiting from a novel-type fluoroelectrochemical ion-selective membrane (FE-ISM).…”

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confidence: 99%

Emission Intensity Readout of Ion-Selective Electrodes Operating under an Electrochemical Trigger

et al. 2021

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We report for the first time on in situ transduction of electrochemical responses of ion-selective electrodes, operating under non-zero-current conditions, to emission change signals. The proposed novel-type PVC-based membrane comprises a dispersed redox and emission active ion-to-electron transducer. The electrochemical trigger applied induces a redox process of the transducer, inducing ion exchange between the membrane and the solution, resulting also in change of its emission spectrum. It is shown that electrochemical signals recorded for ion-selective electrodes operating under voltammetric/coulometric conditions correlate with emission intensity changes recorded in the same experiments. Moreover, the proposed optical readout offers extended linear response range compared to electrical signals recorded in voltammetric or coulometric mode.

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confidence: 99%

Emission Intensity Readout of Ion-Selective Electrodes Operating under an Electrochemical Trigger

et al. 2021

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“…Nanoparticles of POTÀ Py or POT-amPy have been prepared using standard nanoprecipitation method [1,14]. Resulting nanospheres were characterized with similar size as those obtained from POT as seen from TEM pictures, Figure S2.…”

Section: Nanoparticlesmentioning

confidence: 95%

“…Additional benefits of POT are optical properties dependent on the oxidation state of the polymer, which can be followed both in absorption and – characterized with higher sensitivity – emission mode . The latter is a foundation of application of POT to prepare ion‐selective optodes of response mechanism independent of hydrogen ion‐exchange between the sensor and the sample . For POT based optodes emission changes accompanying variations of the ratio of amount of oxidized and neutral polymer backbones for POT nanospheres containing ionophore and ion‐exchanger result in nanostructural optodes applicable in much wider pH range compared to classical systems based on pH sensitive optical transducers .…”

Section: Introductionmentioning

confidence: 99%

pH Switchable Electrochemical and Optical Properties of Polyoctylthiophene – Pyrene Composites

et al. 2020

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Polyoctylthiophene electrochemical and optical properties are dependent on the polymer oxidation state, generally requiring presence of doping ions. In this work polyoctylthiophene composites with pyrene or aminopyrene have been prepared and studied using optical and electrochemical methods. It is shown that in the composite formed pyrene molecules act as molecular dopant for the conducting polymer, resulting in a system of partially oxidized polythiophene backbone, yet of high lipophilicity. On the other hand, composite of aminopyrene with polyoctylthiophene is characterized with pH dependent electrochemical and optical properties. The difference arises mostly from the protonation/ deprotonation reaction occurring for aminopyrene embedded in polyoctylothiophene. Nanoparticles of polythiophene‐aminopyrene show turn‐on emission dependence on increase of hydrogen ions concentration in solution in a wide pH range from 12 to 5. For low pH high emission activity is observed for nanoparticles, whereas for films high lipophilicity and low electrochemical activity pointing to presence of semiconducting polymer in the system for protonated aminopyrene. For high pH, when deprotonation of aminopyrene is observed, the system is characterized with low optical, yet high electrochemical activity and low lipophilicity. The electrochemical activity of polyoctylthiophene‐aminopyrene composite can be reversibly switched simply by solution pH change.

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“…In the present study, we develop and ETH 5294-based optical pH sensor with a similar pectin-chitosan PEC matrix as a tool for fish freshness monitoring. ETH 5294 is a common active agent used for sensors with various immobilizing matrices, such as chitosan [26], pectin [8], κ-carrageenan [27] and polythiophene [28]. The chemical structure of ETH 5294 can be protonated and deprotonated under acidic and alkaline pH ranges, respectively, resulting in changes in color (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

Fabrication of an Immobilized Polyelectrolite Complex (PEC) Membrane from Pectin-Chitosan and Chromoionophore ETH 5294 for pH-Based Fish Freshness Monitoring

et al. 2022

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Considering the significance of its demand around the world, the accurate determination of fish freshness with a simple and rapid procedure has become an interesting issue for the fishing industry. Hence, we aimed to fabricate a new optical pH sensor based on a polyelectrolyte (PEC) membrane of pectin–chitosan and the active material chromoionophore ETH 5294. A trial-and-error investigation of the polymer compositions revealed that the optimum ratio of pectin to chitosan was 3:7. With an optimum wavelength region (λ) at 610 nm, the constructed sensor was capable of stable responses after 5 min exposure to phosphate-buffered solution. Furthermore, the obtained sensor achieved optimum sensitivity when the PBS concentration was 0.1 M, while the relative standard deviation values ranged from 2.07 to 2.34%, suggesting good reproducibility. Further investigation revealed that the sensor experienced decreased absorbance of 16.67–18.68% after 25 days of storage. Employing the optimum conditions stated previously, the sensor was tested to monitor fish freshness in samples that were stored at 4 °C and ambient temperature. The results suggested that the newly fabricated optical sensor could measure pH changes on fish skin after 25 h storage at room temperature (pH 6.37, 8.91 and 11.02, respectively) and 4 °C (pH 6.8, 7.31 and 7.92, respectively).

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Tailoring polythiophene cation-selective optodes for wide pH range sensing

Cited by 20 publications

References 31 publications

Emission Intensity Readout of Ion-Selective Electrodes Operating under an Electrochemical Trigger

Emission Intensity Readout of Ion-Selective Electrodes Operating under an Electrochemical Trigger

pH Switchable Electrochemical and Optical Properties of Polyoctylthiophene – Pyrene Composites

Fabrication of an Immobilized Polyelectrolite Complex (PEC) Membrane from Pectin-Chitosan and Chromoionophore ETH 5294 for pH-Based Fish Freshness Monitoring

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