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Issue 3, 2014
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Optimized colorimetric sensor strip for mercury(II) assay using hierarchical nanostructured conjugated polymers

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Abstract

Creating a sensitive and selective method that can provide simple, practical and high-throughput determination of levels of Hg2+ ions in water has proved extremely challenging. This work responds to these challenges by designing, fabricating and evaluating a polyaniline (PANI) based immobilized sensor optimized to exhibit a colorimetric response to trace amount of Hg2+ ions. The sensor design is realized using a leucoemeraldine based PANI as probe, which has a specific interaction with Hg2+ and results in both “off–on” and “color-change” signals. Hierarchical structured nanofibrous sensing membranes within well immobilized probes are fabricated by a bottom-up blending electrospinning nanofabrication method. This sensor shows a vivid colorimetric response specifically to Hg2+ ions (white–yellow/green–green–blue) over other possible interfering metal cations and achieves a low detection limit of 5 nM observed by the naked eye. Additionally, the sensing responses are visualized quantitatively by employing a colorimetric framework that translates measured spectra into numeric color values directly related to color perception. Furthermore, the as-prepared sensors exhibited good reversibility after extended regeneration cycles, which suggests a promising analytical method as an economical alternative to traditional Hg2+ sensors and also provides a new insight into the design and development of a novel colorimetric sensing system based on PANI immobilized materials.

Graphical abstract: Optimized colorimetric sensor strip for mercury(ii) assay using hierarchical nanostructured conjugated polymers

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Publication details

The article was received on 26 Sep 2013, accepted on 25 Oct 2013 and first published on 25 Oct 2013


Article type: Paper
DOI: 10.1039/C3TA13867D
Citation: J. Mater. Chem. A, 2014,2, 645-652
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    Optimized colorimetric sensor strip for mercury(II) assay using hierarchical nanostructured conjugated polymers

    Y. Si, X. Wang, Y. Li, K. Chen, J. Wang, J. Yu, H. Wang and B. Ding, J. Mater. Chem. A, 2014, 2, 645
    DOI: 10.1039/C3TA13867D

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