Special Issue "Ionophore-Based Potentiometric Sensors"

A special issue of Chemosensors (ISSN 2227-9040).

Deadline for manuscript submissions: closed (30 September 2015)

Special Issue Editor

Guest Editor
Prof. Dr. Johan Bobacka

Process Chemistry Centre, c/o Laboratory of Analytical Chemistry, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo-Turku, Finland
Website | E-Mail
Interests: chemical sensors; ion-selective electrodes; solid-contact ises, conducting polymers; potentiometry

Special Issue Information

Dear Colleagues,

Ionophore-based potentiometric sensors or ion-selective electrodes (ISEs) are chemical sensors where host-guest chemistry is utilized to achieve high selectivity to specific ions of interest. A unique feature of ISEs is that they provide information about the free ion concentration (ion activity), which is highly relevant in, e.g., clinical diagnostics, biosciences and environmental monitoring. In today’s modern society there is a clear demand for portable and easy-to-use chemical sensors, such as ISEs, in order to ensure a safe and clean environment, personal health and welfare for the growing population on Earth.

Intensive research in the area of ISEs over the last two decades has resulted in large improvements in the analytical performance of these sensors. Novel transduction mechanisms are continuously being explored and new sensor materials are being developed. The development is going in the direction of printable, disposable and wearable sensors as well as wireless sensor networks.

Nonetheless, despite impressive progress in recent years, ionophore-based sensors still have limitations that prevent their widespread use in everyday life. Obtaining, e.g., calibration-free ISEs still involves major challenges, and the potential benefits are huge. The aim of this Special issue is to bring together new results in research and development that focus on the most recent advances in (i) solid-contact ISEs and solid-contact reference electrodes, (ii) printable ISEs, (iii) disposable ISEs, (iv) wearable ISEs and (v) wireless sensor networks utilizing ISEs.

Prof. Dr. Johan Bobacka
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Chemosensors is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 350 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ion-selective electrodes
  • ionophore-based potentiometric sensors
  • solid-state ion-to-electron transduction
  • materials and fabrication methods
  • applications

Published Papers (3 papers)

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Research

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Open AccessArticle Plasticizer Effects in the PVC Membrane of the Dibasic Phosphate Selective Electrode
Chemosensors 2015, 3(4), 284-294; doi:10.3390/chemosensors3040284
Received: 23 July 2015 / Revised: 3 December 2015 / Accepted: 8 December 2015 / Published: 11 December 2015
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Abstract
The PVC membrane of an ion-selective electrode (ISE) sensitive to dibasic phosphate ions (HPO4-ISE) has not been optimized for maximum selectivity, sensitivity, and useable ISE lifetime and further work was necessary to improve its performance. Two areas of investigation are reported
[...] Read more.
The PVC membrane of an ion-selective electrode (ISE) sensitive to dibasic phosphate ions (HPO4-ISE) has not been optimized for maximum selectivity, sensitivity, and useable ISE lifetime and further work was necessary to improve its performance. Two areas of investigation are reported here: include the parameters for the lipophilicity of the plasticizer compound used and the amount of cyclic polyamine ionophore incorporated in the PVC membrane. Six candidate plasticizers with a range of lipophilicity were evaluated for their effect on the useable lifetime, sensitivity, and selectivity of the ISE against 13 different anions. Selectivity was determined by a modified fixed interferent method, sensitivity was determined without interferents, and the usable lifetime evaluated at the elapsed time where 50% of the HPO4-ISE failed (L50). The results show that choosing a plasticizer that has a lipophilicity similar to the ionophore’s results in the best selectivity and sensitivity and the longest L50. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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Open AccessArticle Carbon Nanotubes-Based Potentiometric Bio-Sensors for Determination of Urea
Chemosensors 2015, 3(3), 200-210; doi:10.3390/chemosensors3030200
Received: 28 April 2015 / Revised: 23 June 2015 / Accepted: 15 July 2015 / Published: 24 July 2015
Cited by 1 | PDF Full-text (381 KB) | HTML Full-text | XML Full-text
Abstract
The possibility of using disposable plastic-carbon potentiometric sensors as enzyme biosensors was examined. Urease enzyme was immobilized on poly(vinyl chloride) based H+- or NH4+-selective membranes using cellulose acetate. This approach has resulted in a potentiometric response on changing
[...] Read more.
The possibility of using disposable plastic-carbon potentiometric sensors as enzyme biosensors was examined. Urease enzyme was immobilized on poly(vinyl chloride) based H+- or NH4+-selective membranes using cellulose acetate. This approach has resulted in a potentiometric response on changing the pH of the solution or NH4+ ion content due to an enzymatic reaction that occurs between urease and urea. Both types of potentiometric biosensors for urea were characterized by good analytical parameters as high sensitivity and fast response time. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)

Review

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Open AccessReview Application of Photocured Polymer Ion Selective Membranes for Solid-State Chemical Sensors
Chemosensors 2015, 3(2), 190-199; doi:10.3390/chemosensors3020190
Received: 27 March 2015 / Accepted: 22 May 2015 / Published: 2 June 2015
Cited by 2 | PDF Full-text (405 KB) | HTML Full-text | XML Full-text
Abstract
Application of conducting polymers with additional functional groups for a solid contact formation and photocurable membranes as sensitive elements of solid-state chemical sensors is discussed. Problems associated with application of UV-curable polymers for sensors are analyzed. A method of sensor fabrication using copolymerized
[...] Read more.
Application of conducting polymers with additional functional groups for a solid contact formation and photocurable membranes as sensitive elements of solid-state chemical sensors is discussed. Problems associated with application of UV-curable polymers for sensors are analyzed. A method of sensor fabrication using copolymerized conductive layer and sensitive membrane is presented and the proof of concept is confirmed by two examples of solid-contact electrodes for Ca ions and pH. Full article
(This article belongs to the Special Issue Ionophore-Based Potentiometric Sensors)
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