Abstract
In this work, we have developed a full-featured electrochemiluminescence (ECL) sensing platform based on a multichannel closed bipolar system. Owing to the three-channel and double-bipolar electrode (BPE) configuration, all the oxidants, reductants, or chemicals that are directly related to the ECL process can be detected in a single device, which greatly expanded the application range of the Ru(bpy)3(2+)-TPA (tripropylamine) anodic ECL reaction. First of all, a more universal and accurate mechanism for all the bipolar systems was proposed by observing the reactions that occurred in the device with universal pH indicator and ITO BPEs. On the basis of that, Pt was electrodeposited onto all the ITO cathodes to improve the signal stability and construct the multifunctional ECL sensor. With this design, the determination of H2O2, ascorbic acid (AA), TPA, glucose, and blood sugar were achieved in a single device. More importantly, we have demonstrated that the constructed sensor array can be used as a high-throughput molecular keypad lock in the visual ECL experiment. This design therefore shows great promise in various fields.
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