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Sulfur vacancy-mediated self-photocatalysis boosted electrochemiluminescence sensing via molecular oxygen activation for sensitive detection of isocarbophos
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DOI：10.1039/D6AN00561F.png)
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Abstract
En 中文
The luminol-dissolved oxygen electrochemiluminescence (ECL) system is fundamentally limited by the poor redox activity of oxygen; which fails to generate sufficient reactive oxygen species (ROS) for efficient luminol excitation; restricting the performances of the sensors. Herein; a high-performance ECL sensor was fabricated for sensitive detection of isocarbophos (ICP) by utilizing sulfur vacancy engineered ZnIn 2 S 4 (S v -ZIS) as a novel photocatalysis co-reaction accelerator with superior molecular oxygen activation. The introduction of sulfur vacancy not only effectively enhanced visible-light harvesting but also accelerated interfacial electron transfer while maintaining a sufficient thermodynamic driving force for O 2 reduction; generating abundant ROS for the luminol ECL reaction; thus remarkably boosting the ECL signal intensity and luminescence stability of the system. By integrating with the specific target recognition capability of aptamers; the as-fabricated aptasensor achieved highly sensitive and specific detection of organophosphorus pesticide ICP; with a linear range of 0.1 ~ 50 ng/mL; an ultralow limit of detection (LOD) of 32.63 pg/mL at a signal-to-noise (S/N) ratio of 3; and excellent detection stability. This proposed sensing platform can be successfully applied to the quantitative determination of ICP in real samples; providing a reliable strategy for pesticide residue monitoring and a new avenue for sensitive detection of hazardous small molecules in environmental and food analysis.
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