Abstract
AbstractA novel paper‐based bipolar electrode‐electrochemiluminescence (pBPE‐ECL) switch system was used for the rapid, label‐free, and sensitive detection of Hg2+. In the proposed approach, Hg2+ selectively mediates two thymine‐enriched single‐stranded DNA probes to form double‐stranded DNA (dsDNA). In the presence of Hg2+, the “light‐switch” molecule [Ru(phen)2dppz]2+ can freely intercalate into the base pairs of the dsDNA, resulting in intense ECL emission. The assay takes advantage of the wireless pBPE‐ECL platform to yield a low‐cost, disposable, and sensitive analysis. The system has a limit of 0.1 nM for Hg2+ detection. We also showed that the system can be used to distinguish Hg2+ over other metal ions, including Pb2+, Zn2+, Cu2+, Ba2+, Co2+, Cd2+, Fe3+, Mn2+, and Li+. Moreover, the proposed approach was rapid, low‐cost, and label‐free for effective sensing of Hg2+ in drinking and lake water.
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