CdS Quantum Dots-Regulated g-CN Electrochemiluminescence and Photoelectrochemical Performance for Multimodal Sensing and Imaging Assay of .

In order to solve the problem of low electrochemiluminescence (ECL) intensity and resolution for imaging detection, we innovatively discovered for the first time that the ECL quantum efficiency of the CdS quantum dots (QDs)/g-CN/KSO system is 18.4 times that of the g-CN/KSO system, so CdS QDs/g-CN displays high-intensity ECL and can be used for mobile phone ECL imaging. In particular, CdS QDs combined with g-CN can produce a new color, from the original blue to green, which greatly improves the ECL imaging resolution and detection sensitivity, thus achieving high-resolution visual ECL analysis of the target. Furthermore, CdS QDs/g-CN also shows excellent photoelectrochemical (PEC) properties. Therefore, a unique multimode sensing and colorimetric imaging platform based on CdS QDs/g-CN is constructed. A target was induced to produce many S2 through cyclic amplification. The porous magnetic FeO nanoparticles (NPs) were used to load a large number of CdS QDs, and target-related S2 opened S1 on FeO NPs to release many CdS QD probes, which can further amplify the signal. After convenient magnetic separation for CdS QDs corresponding to the target, the released CdS QDs were added to g-CN nanosheets to realize multimode detection of ECL, imaging, and PEC of . This work not only innovatively found that CdS QDs can change the luminous color of g-CN and CdS QDs/g-CN display high-intensity ECL, but also developed a new PEC-ECL-imaging multimode sensor with excellent performance, which greatly improves the detection sensitivity and accuracy, and makes a significant contribution to the ECL analysis field.