1. Porous Prussian blue nanolayers formed in situ on Fe-MOFs-modified electrode surfaces by electrochemically triggered dual-templating effect for ultrasensitive detection of lead ions and Staphylococcus aureus.
- Author
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Li, Yi, Ying, Yupeng, Wu, Yongshan, Xie, Shuyu, and Chen, Dongmei
- Subjects
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PRUSSIAN blue , *LEAD , *OXYGEN evolution reactions , *ELECTRODES , *DETECTION limit - Abstract
In this study, introducing Fe-MOFs as reactants to the electrode surface creates a novel mode for modulating interface performance that can lead to rapid enrichment of reactants in the proximity of electrodes by electrochemical-induced confinement effect. A facile, controllable, and room temperature electrochemical approach utilizes Fe-MOFs as nanotemplates to produce porous Prussian blue (PB) nanolayers on the electrode surfaces. Unlike conventional chemical conversion that needs a supply of exogenous acid regents, the electrochemical method creates a solid acidic condition in the oxygen evolution reaction cycle to release Fe3+ from the Fe-MOFs, improving conversion efficiency and electrochemical activity of PB. Furthermore, small oxygen bubbles generated by splitting H 2 O near the electrodes are also good templates, promoting the formation of porous structures that can increase effective surface area and mass-transfer efficiency. As a conceptional application, using Fe-MOFs as self-sacrificial tags, an ultrasensitive electrochemical platform with triple amplification is developed to detect Pb2+ and S. aureus based on DNAzyme-CHA cascade reaction. The designed platform shows low detection limits of 8.5 fM and 1 CFU/mL for Pb2+ and S. aureus , respectively. Moreover, the platform has high selectivity, stability and reproducibility, and also shows satisfactory recovery rates when validated using actual samples. • Porous structure generated by small oxygen bubbles can enhance conductivity. • Fe-MOFs can form Prussian blue nanolayer in situ through electrochemical conversion. • An electrochemical platform was constructed based on triple amplification strategy. • Ultrasensitive detection of Pb2+ and S. aureus was achieved. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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