The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
Johan Bobacka - One of the best experts on this subject based on the ideXlab platform.
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conducting polymer based solid state Ion Selective Electrodes
Electroanalysis, 2006Co-Authors: Johan BobackaAbstract:Conducting polymers, i.e., electroactive conjugated polymers, are useful both as Ion-to-electron transducers and as sensing membranes in solid-state Ion-Selective Electrodes. Recent achievements over the last few years have resulted in significant improvements of the analytical performance of solid-contact Ion-Selective Electrodes (solid-contact ISEs) based on conducting polymers as Ion-to-electron transducer combined with polymeric Ion-Selective membranes. A significant amount of research has also been devoted to solid-state ISEs based on conducting polymers as the sensing membrane. This review gives a brief summary of the progress in the area in recent years.
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potential stability of all solid state Ion Selective Electrodes using conducting polymers as Ion to electron transducers
Analytical Chemistry, 1999Co-Authors: Johan BobackaAbstract:Demanding analytical applicatIons such as on-line process analysis and clinical analysis require robust, reliable, and maintenance-free Ion sensors of high potential stability. In this work the stability of the electrode potential of all-solid-state Ion-Selective Electrodes using conducting polymers as Ion-to-electron transducers is critically evaluated by using chronopotentiometry and electrochemical impedance spectroscopy. This study is focused on the relatIonship between the potential stability of the electrode and the capacitance of the solid contact where Ion-to-electron transductIon takes place. The influence of this capacitance on the potential stability of all-solid-state Ion-Selective Electrodes is studied experimentally by using conducting polymer layers of different thickness as solid contacts in potassium Ion-Selective Electrodes based on a solvent polymeric membrane. Because of its excellent environmental stability, the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is used as a model compound for the solid contact material. Chronopotentiometry is found to be a convenient and fast experimental method to critically evaluate the potential stability of different types of Ion-Selective Electrodes.
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potential stability of all solid state Ion Selective Electrodes using conducting polymers as Ion to electron transducers
Analytical Chemistry, 1999Co-Authors: Johan BobackaAbstract:Demanding analytical applicatIons such as on-line process analysis and clinical analysis require robust, reliable, and maintenance-free Ion sensors of high potential stability. In this work the stability of the electrode potential of all-solid-state Ion-Selective Electrodes using conducting polymers as Ion-to-electron transducers is critically evaluated by using chronopotentiometry and electrochemical impedance spectroscopy. This study is focused on the relatIonship between the potential stability of the electrode and the capacitance of the solid contact where Ion-to-electron transductIon takes place. The influence of this capacitance on the potential stability of all-solid-state Ion-Selective Electrodes is studied experimentally by using conducting polymer layers of different thickness as solid contacts in potassium Ion-Selective Electrodes based on a solvent polymeric membrane. Because of its excellent environmental stability, the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is used as a ...
Agata Michalska - One of the best experts on this subject based on the ideXlab platform.
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introducing cobalt ii porphyrin cobalt iii corrole containing transducers for improved potential reproducibility and performance of all solid state Ion Selective Electrodes
Analytical Chemistry, 2017Co-Authors: Ewa Jaworska, Krzysztof Maksymiuk, Mario L Naitana, Emilia Stelmach, Giuseppe Pomarico, Marcin Wojciechowski, Ewa Bulska, Roberto Paolesse, Agata MichalskaAbstract:A novel solid contact type for all-solid-state Ion-Selective Electrodes is introduced, yielding high stability and reproducibility of potential readings between sensors as well as improved analytical performance. The transducer phase herein proposed takes advantage of the presence of porphyrinoids containing the same metal Ion at different oxidatIon states. In contrast to the traditIonal approach, the compounds of choice are not a redox pair; although they have different oxidatIon states, they cannot be electrochemically driven one to another. The compounds of choice were cobalt(II) porphyrin and cobalt(III) corrole—both characterized by a high stability of the coordinated metal Ions in their respective redox states and electrical neutrality, as well as relatively high lipophilicity. The porphyrinoids were used together with carbon nanotubes to yield transducer layers for Ion-Selective Electrodes. As a result, we obtained a high stability of potential readings of the resulting Ion-Selective Electrodes tog...
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gold nanoparticles solid contact for Ion Selective Electrodes of highly stable potential readings
Talanta, 2011Co-Authors: Ewa Jaworska, Michal Wojcik, Anna Kisiel, Jozef Mieczkowski, Agata MichalskaAbstract:Internal solutIon free Ion-Selective Electrodes were prepared applying for the first time gold nanoparticles as a solid contact layer. The presence of a layer of gold nanoparticles stabilized with aliphatic thiols at the back side of the membrane resulted in highly stable potentiometric responses of the sensors, good selectivities and close to Nernstian slopes. Electrochemical studies have confirmed that the applied material is effectively working as capacitive solid contact, yielding high stability sensors.
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optimizing the analytical performance and constructIon of Ion Selective Electrodes with conducting polymer based Ion to electron transducers
Analytical and Bioanalytical Chemistry, 2005Co-Authors: Agata MichalskaAbstract:All-solid-state Ion-Selective Electrodes that use a conducting polymer as the Ion-to-electron transducer have emerged as one of the most promising classes of all-solid-state potentiometric sensors in recent years. This is largely because it has many analytical advantages, including high response stability, which is unique in the field of internal-solutIon-free Ion-Selective Electrodes. This paper reviews the considerable progress that has been made in this area of sensing in recent years, in terms of detectIon limits, selectivity coefficients and novel constructIon methods.
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all plastic disposable low detectIon limit Ion Selective Electrodes
Analytica Chimica Acta, 2004Co-Authors: Agata Michalska, Krzysztof MaksymiukAbstract:Abstract A novel concept for all-plastic and all-solid-state Ion-Selective Electrodes (ISEs) is introduced. Planar, flexible Ion-Selective Electrodes, comprising only polymeric materials, with no internal solutIon, were obtained. The cast conducting polymer layer (obtained from aqueous suspensIon) was covered with a solvent polymeric based membrane to obtain a planar all-plastic sensor. The conducting polymer layer served both as electrical contact and as Ion-to-electron transducer. To illustrate this concept, the conducting polymer poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) Ions (PEDOT–PSS, Baytron P) was chosen. Due to interactIon, analyte catIons–poly(4-styrenesulfonate) anIons, an extended linear range of potentiometric responses was obtained, with lowered detectIon limit. As example, Ca2+-Selective and K+-Selective all-plastic Electrodes were fabricated and yielded with high selectivity, near Nernstian slopes and fast responses. The detectIon limits obtained for Ca2+- and K+-Selective sensors were 5 × 10−9 M CaCl2 and 4.4 × 10−7 M KCl, respectively. The possibilities of modifying the conducting polymer-phase compositIon is highlighted. This method is extremely useful to tune the desired type of responses, and cannot be directly applied for electrochemically deposited conducting polymers.
Erkang Wang - One of the best experts on this subject based on the ideXlab platform.
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Rare earth Ion Selective Electrodes
Electroanalysis, 1993Co-Authors: Yonghua Zhang, Erkang WangAbstract:In this article, we report the rare earth Ion Selective Electrodes developed in our laboratory. Rare earth containing functIonal copolymers, rare earth oxides, and chelates have been used as active materials. Methods for preparing raw materials, behavior of Electrodes, and applicatIon of rare earth Ion Selective Electrodes in flow injectIon analysis have been discussed as well.
Yoshio Umezawa - One of the best experts on this subject based on the ideXlab platform.
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Potentiometric coefficients of Ion-Selective Electrodes. Part III. Organic Ions (IUPAC Technical Report)
Pure and Applied Chemistry, 2009Co-Authors: Yoshio Umezawa, Kayoko Umezawa, Phillipe Buhlmann, Naoko HamadaAbstract:Potentiometric selectivity coefficients, KA,Bpot, have been collected for Ionophore-based Ion-Selective Electrodes (ISEs) for organic Ions reported during 1988-1998. In additIon to the actual numerical values of KA,Bpot together with the methods and conditIons for their determinatIon, response slopes, linear ranges, chemical compositIons, and Ionophore structures for the ISE membranes are tabulated.
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potentiometric selectivity coefficients of Ion Selective Electrodes part ii inorganic anIons
2002Co-Authors: Yoshio Umezawa, Kayoko Umezawa, Philippe Buhlmann, Naoko Hamada, Hiroshi Aoki, Jun Nakanishi, Moritoshi Sato, Kang Ping Xiao, Yukiko NishimuraAbstract:Potentiometric selectivity coefficients, K A,B, have been collected for Ionophore-based Ion-Selective Electrodes (ISEs) for inorganic catIons reported from 1988–1997. In additIon to numerical values of K A,B, together with the methods and conditIons for their determinatIon, response slopes, linear concentratIon ranges, chemical compositIons, and Ionophore structures for the ISE membranes are tabulated.
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potentiometric selectivity coefficients of Ion Selective Electrodes part ii inorganic anIons iupac technical report
Pure and Applied Chemistry, 2002Co-Authors: Yoshio Umezawa, Kayoko Umezawa, Philippe Buhlmann, Naoko Hamada, Hiroshi Aoki, Jun Nakanishi, Moritoshi Sato, Kang Ping Xiao, Yukiko NishimuraAbstract:Potentiometric selectivity coefficients, K p o t A , B , have been collected for Ionophore-based Ion-Selective Electrodes (ISEs) for inorganic anIons reported during 1988-1998. In additIon to the actual numerical values ofK p o t A . B together with the methods and conditIons for their determinatIon, response slopes, linear concentratIon (activity) ranges, chemical compositIons, and Ionophore structures for the ISE membranes are tabulated.
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potentiometric selectivity coefficients of Ion Selective Electrodes part i inorganic catIons technical report
Pure and Applied Chemistry, 2000Co-Authors: Yoshio Umezawa, Kayoko Umezawa, Philippe Buhlmann, Koji Tohda, Shigeru AmemiyaAbstract:Potentiometric selectivity coefficients, K p o t A , B , have been collected for Ionophore-based Ion-Selective Electrodes (ISEs) for inorganic catIons reported from 1988-1997. In additIon to numerical values of K p o t A , B , together with the methods and conditIons for their determinatIon response slopes, linear concentratIon ranges, chemical compositIons, and Ionophore structures for the ISE membranes are tabulated.
Ewa Jaworska - One of the best experts on this subject based on the ideXlab platform.
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introducing cobalt ii porphyrin cobalt iii corrole containing transducers for improved potential reproducibility and performance of all solid state Ion Selective Electrodes
Analytical Chemistry, 2017Co-Authors: Ewa Jaworska, Krzysztof Maksymiuk, Mario L Naitana, Emilia Stelmach, Giuseppe Pomarico, Marcin Wojciechowski, Ewa Bulska, Roberto Paolesse, Agata MichalskaAbstract:A novel solid contact type for all-solid-state Ion-Selective Electrodes is introduced, yielding high stability and reproducibility of potential readings between sensors as well as improved analytical performance. The transducer phase herein proposed takes advantage of the presence of porphyrinoids containing the same metal Ion at different oxidatIon states. In contrast to the traditIonal approach, the compounds of choice are not a redox pair; although they have different oxidatIon states, they cannot be electrochemically driven one to another. The compounds of choice were cobalt(II) porphyrin and cobalt(III) corrole—both characterized by a high stability of the coordinated metal Ions in their respective redox states and electrical neutrality, as well as relatively high lipophilicity. The porphyrinoids were used together with carbon nanotubes to yield transducer layers for Ion-Selective Electrodes. As a result, we obtained a high stability of potential readings of the resulting Ion-Selective Electrodes tog...
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gold nanoparticles solid contact for Ion Selective Electrodes of highly stable potential readings
Talanta, 2011Co-Authors: Ewa Jaworska, Michal Wojcik, Anna Kisiel, Jozef Mieczkowski, Agata MichalskaAbstract:Internal solutIon free Ion-Selective Electrodes were prepared applying for the first time gold nanoparticles as a solid contact layer. The presence of a layer of gold nanoparticles stabilized with aliphatic thiols at the back side of the membrane resulted in highly stable potentiometric responses of the sensors, good selectivities and close to Nernstian slopes. Electrochemical studies have confirmed that the applied material is effectively working as capacitive solid contact, yielding high stability sensors.
