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Rhodamine-based conjugated polymers: potentiometric, colorimetric and voltammetric sensing of mercury ions in aqueous medium

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Abstract

Herein, we report the synthesis and characterization of a new rhodamine-based monomer (RD-CZ), and an investigation of the optical and electrochemical properties of the corresponding polymer (P(RD-CZ)), which was electropolymerized on an ITO electrode. The resulting P(RD-CZ) polymer film was used as a simple and novel multi-signal sensor platform, which demonstrates ion-selective potentiometric, colorimetric and voltammetric responses in aqueous media for the first time. P(RD-CZ) exhibits excellent selectivity for Hg2+ ions compared with Cd2+, Cu2+ Zn2+, and Fe3+ using the potentiometric technique, which depends on the increasing charge carrier transport through rhodamine-bound Hg2+ with a limit of detection (LOD) of 9.77 × 10−8 M. The P(RD-CZ) polymer film also exhibits a distinct color change from orange to purple, which is detectable even by the naked eye, in the presence of Hg2+ ions. The LOD for Hg2+ ions obtained using the colorimetric method is 3.16 × 10−8 M. The same material has also been used for the voltammetric sensing of Hg2+ in aqueous media with a detection limit of 1 × 10−7 M. In this study, a conductive polymer-based sensor platform for detecting mercury ions via three different methods has been designed for the first time. By doing so, a disposable planar paper-based ion-sensing platform, which is suitable for low-cost point-of-care and in-field testing applications, could be fabricated with a highly reproducible and linear response towards different concentrations of analyte ions in aqueous and biological samples.

Graphical abstract: Rhodamine-based conjugated polymers: potentiometric, colorimetric and voltammetric sensing of mercury ions in aqueous medium

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Publication details

The article was received on 10 Apr 2017, accepted on 05 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7AN00606C
Citation: Analyst, 2017, Advance Article
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    Rhodamine-based conjugated polymers: potentiometric, colorimetric and voltammetric sensing of mercury ions in aqueous medium

    R. Ayranci, D. O. Demirkol, S. Timur and M. Ak, Analyst, 2017, Advance Article , DOI: 10.1039/C7AN00606C

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