Polarity-Switching Self-Calibrated Mip-Pec Sensor Based on Core-Shell S-Tio2/Cds/Pcn-224 for Accurate Detection of Tetracycline

Niu, Qijian; Zhang, Mengge; Ji, Guanya; Wang, Tao; Wang, Jing; Duan, Hongwei; Ola, Oluwafunmilola; Dong, Xiuxiu; Liu, Qian

Abstract

Polarity switching photoelectrochemical (PEC) sensing can effectively solve the problem of false positive or negative results caused by PEC single signal on or signal off. In this paper, a novel core-shell ternary composite material of S-TiO2/CDs/PCN-224 was constructed by growing PCN-224 on the surface of spherical titanium dioxide (S-TiO2) and confining carbon dots (CDs) simultaneously. This ternary composite material could generate both cathodic and anodic PEC signal under visible (420-800 nm) and ultraviolet-visible (320-800 nm) excitation, respectively. Based on this property, the polarity switching PEC sensing was constructed by combining tetracycline (TC) molecular imprinting polymer, which dual signals can realize self-calibrated of TC detection results. More importantly, the turn off cathodic signal from steric hindrance is conducive to avoiding interference, and the anodic signal from advanced oxidation of TC can achieve a turn on signal amplification and self-cleaning of the electrode interface to improve the reusability of the MIP-PEC sensor. Finally, the constructed MIP-PEC sensor exhibits the cathodic mode detection range is 5.00×10-13-1.00×10-8 mol/L with the limit of detection (LOD) of 3.07×10-13 mol/L and an anodic mode detection range is 5.00×10-12-5.00×10-6 mol/L with the LOD of 3.14×10-12 mol/L under optimal conditions. Meanwhile, it has good dual-signal stability, reproducibility and reusability. This work provides a sustainable and efficient PEC sensing platform which can realize polarity switching self-calibration, self-cleaning and high analytical performance for environmental organic pollutant detection.

Citation

Niu, Q., Zhang, M., Ji, G., Wang, T., Wang, J., Duan, H., Ola, O., Dong, X., & Liu, Q. (2025). Polarity-Switching Self-Calibrated Mip-Pec Sensor Based on Core-Shell S-Tio2/Cds/Pcn-224 for Accurate Detection of Tetracycline

• Working Paper Type: Preprint
• Online Publication Date: Feb 6, 2025
• Publication Date: Feb 6, 2025
• Deposit Date: Feb 14, 2025
• DOI: https://doi.org/10.2139/ssrn.5126822
• Public URL: https://nottingham-repository.worktribe.com/output/45314772
• Publisher URL: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5126822