DNAzyme-mediated CHA-HCR cascade amplification enabling dual-mode electrochemical/colorimetric sensing of ultra-trace lead ions with smartphone readout.
Trace lead ions (Pb2+) can seriously damage ecosystems and human health. Thus, it is urgent to develop reliable detection methods with high sensitivity and selectivity. This work constructs an electrochemical/colorimetric dual-mode biosensor for ultra-trace Pb2+ detection. The sensor combines Pb2+-specific DNAzyme reco...