Selectivity Enhancement for Chloride Ion by In(III)‐Porphyrin‐Based Polymeric Membrane Electrode Operated in Pulsed Chronopotentiometric Mode

Gemene, Kebede L.; Meyerhoff, Mark E.

doi:10.1002/elan.201200021

Cited by 12 publications

(8 citation statements)

References 26 publications

(28 reference statements)

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“…However, the study of the device sensitivities alone does not provide enough information about the diffusion of ions inside these films. In some cases, a low sensitivity can also be a consequence of a co-diffusion inside the films of the target cation and the counter ion [ 11 , 53 , 54 ]. Thus, a monitoring of the mass changes inside the films at sub-micron scales was conducted using quartz microbalance to determine how the thickness of the films influenced the absorption properties of the sensing films ( Figure 4 h).…”

Section: Resultsmentioning

confidence: 99%

Integration of an Aerosol-Assisted Deposition Technique for the Deposition of Functional Biomaterials Applied to the Fabrication of Miniaturised Ion Sensors

Ruiz-Gonzalez

Choy

2021

Nanomaterials

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Ion-selective electrodes are at the forefront of research nowadays, with applications in healthcare, agriculture and water quality analysis among others. Despite multiple attempts of miniaturization of these polyvinyl chloride (PVC) gel-based ion sensors, no ion-sensing devices with a thickness below the micrometer range, and operating using open circuit potential, have been developed so far. This work reports the causes of this thickness limitation in potassium-selective sensors. Highly homogeneous ion-sensing films were fabricated by a method based on aerosol assisted chemical vapour deposition, leading to smooth surfaces with 27 ± 11 nm of roughness. Such homogeneity allowed the systematic study of the performance and ionic diffusion properties of the sensing films at sub-micrometer scales. Sensitivities below the Nernst response were found at low thicknesses. The nature of this reduction in sensitivity was studied, and a difference in the superficial and bulk compositions of the films was measured. An optimal configuration was found at 15 µm, with a good selectivity against Na+ (KK+, Na+ = −1.8) a limit of detection in the range of 10−4 M and esponse time below 40 s. The stability of sensors was improved by the deposition of protective layers, which expanded the lifespan of the ion sensors up to 5 weeks while preserving the Nernst sensitivity.

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Section: Resultsmentioning

confidence: 99%

Integration of an Aerosol-Assisted Deposition Technique for the Deposition of Functional Biomaterials Applied to the Fabrication of Miniaturised Ion Sensors

Ruiz-Gonzalez

Choy

2021

Nanomaterials

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“…The ammonium-sensitive membrane contained 1.0 wt % nonactin, 0.3 wt % KTClPB, 32.9 wt % PVC, and 65.8 wt % o -NPOE . The ion-selective membrane for chloride contained 34% PVC, 51% o -NPOE, and 15% TDMACl. , It should be noted that the selectivity of the membrane can be further improved with the introduction of new ionophores . 100 mg of the membrane components was dissolved in 1.0 mL of THF.…”

Section: Methodsmentioning

confidence: 99%

“…27,28 It should be noted that the selectivity of the membrane can be further improved with the introduction of new ionophores. 29 100 mg of the membrane components was dissolved in 1.0 mL of THF. Polished and well-rinsed glass carbon (GC) disk electrodes with an area of 0.07 cm 2 were used as conducting substrates for solid-contact ISEs.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Optical Ion Sensing Platform Based on Potential-Modulated Release of Enzyme

Ding

Zhu

et al. 2017

Anal. Chem.

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We report here on an optical ion sensing platform, in which a polymeric membrane ion-selective electrode (ISE) serves as not only a potentiometric transducer for ion activities in the sample solution but also a reference electrode for the potential-modulated release of enzyme from an iron-alginate-horseradish peroxidase (HRP) thin film modified working electrode. The ISE and working electrode are physically separated by a salt bridge. The dissolution of the HRP-embedded thin film can be triggered by the reduction of Fe3+, which is modulated by the potential response of the ISE to the target ion in the sample. The released enzyme induces the oxidation of its substrate mediated by H2O2 to produce a visual color change. With this setup, an optical ion sensing platform for both cations (e.g., NH4 +) and anions (e.g., Cl–) can be obtained. The proposed platform provides a general and versatile visual-sensing strategy for ions and allows optical ion sensing in colored and turbid solutions.

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“…Although the introduction of new ionophores, epoxy resin-based anion-responsive polymers and asymmetric two-layer membrane structures have shown remarkable reduction of the interferences from salicylate and made the sensing membrane feasible for practical applications and even available in commercial blood analyzers [38][39][40][41], cost-effective and simple-to-use methods for determination of chloride ions in the presence of interfering ions are still required.…”

Section: Solid-contact Ises For CL −mentioning

confidence: 99%

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

Ding

Lisak

et al. 2017

Sensors and Actuators B: Chemical

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a b s t r a c tThis work demonstrates a paper-based microfluidic sampling and separation platform that allows potentiometric sensing of chloride ions in presence of strongly interfering salicylate ions using a solid-contact ion-selective electrode as a detector. The device was composed of two pieces of paper with different shapes and pore sizes. A "T" shaped filter paper with a pore size of 12-25 m was used as the detection zone. A filter paper with a pore size of 2.0 m was modified with a complexing agent (Fe 3+ ) and served as the separation zone. The two pieces of the paper were joined together just like a jigsaw. A solid-contact Cl − −selective electrode and a reference electrode were gently pressed onto the detection zone to create a direct contact between the electrodes and the solution absorbed in the paper. Utilizing the possibility to form stable complexes between Fe 3+ and salicylate, the proposed platform enables the separation of salicylate and detection of chloride. This system offers a convenient platform for both sampling and separation of ions, in which sample pretreatment procedures can be simplified or avoided.

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Selectivity Enhancement for Chloride Ion by In(III)‐Porphyrin‐Based Polymeric Membrane Electrode Operated in Pulsed Chronopotentiometric Mode

Cited by 12 publications

References 26 publications

Integration of an Aerosol-Assisted Deposition Technique for the Deposition of Functional Biomaterials Applied to the Fabrication of Miniaturised Ion Sensors

Integration of an Aerosol-Assisted Deposition Technique for the Deposition of Functional Biomaterials Applied to the Fabrication of Miniaturised Ion Sensors

Optical Ion Sensing Platform Based on Potential-Modulated Release of Enzyme

Paper-based microfluidic sampling and separation of analytes for potentiometric ion sensing

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