Covalent binding of sensor phases--a recipe for stable potentials of solid-state ion-selective sensors |
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Authors: | Grygołowicz-Pawlak Ewa Palys Barbara Biesiada Krzysztof Olszyna Andrzej R Malinowska Elzbieta |
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Affiliation: | aFaculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;bDepartment of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland;cFaculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland |
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Abstract: | In this work, a new concept of the solid-state sensors free from EMF instabilities is proposed. In order to prevent the formation of an aqueous layer underneath the ion-selective membrane, instead of improving the hydrophobicity of the monolayer, the moieties terminated with acrylate groups were incorporated within the redox-active monolayer structure. It allowed to “sew” all phases of the sensor (i.e., the transducer, the intermediate layer and the ion-selective membrane) and to obtain a stable and durable ion-selective sensor. It is shown that newly designed monolayer containing both the ferrocene- and the acrylate-terminated molecules does not affect the working parameters of the electrode, such as selectivity or the slope of the calibration curve, although the EMF drift of the sensor is significantly reduced to 0.2 mV per day. |
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Keywords: | Solid-state ion-selective sensors Redox-active intermediate monolayer Polyacrylate-based membrane Potential stability |
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