Dual-source signal amplification electrochemiluminescence sensor combined with molecularly imprinted polymers for the imidacloprid detection

• Published in: The Science of the total environment 2024-05, Vol.923, p.171531-171531, Article 171531
• Main Authors: Cai, Lin, Cao, Yichuan, Hao, Wen, Wang, Haiyang, Wang, Yifei, Fang, Guozhen, Wang, Shuo
• Format: Article
• Language: English
• Subjects: Dual-source signal amplification; Electrochemiluminescence; Imidacloprid; Lanthanide metal-organic-gel-derived material; Molecularly imprinted polymers
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2024.171531

A novel lanthanide metal-organic-gel (MOG)-derived material/nitrogen-doped graphdiyne (Tb-Ru-MOG/CeO2/N-GDY) composite with a dual-source signal amplification strategy was prepared and used to construct a molecularly imprinted sensor based on bifunctional monomers for the detection of imidacloprid (IMI) using electrochemiluminescence (ECL). In a green reaction environment, terbium (III) (Tb3+) can undergo multiple coordination reactions with 4′-(4-carboxyphenyl)-2,2′:6′,2″-terpyridine (Hcptpy) and tris(4,4′-dicarboxylicacid-2,2′-bipyridyl) ruthenium (II) dichloride (Ru(dcbpy)32+), and combine with ceria nanoparticles (CeO2 NPs) to form Tb-Ru-MOG/CeO2. Within the Tb-Ru-MOG/CeO2 framework, energy transfer from the double ligands can sensitize the central Tb3+, triggering a distinct antenna effect and energy-transfer, and its polyporous configuration offered a nanoconfined space for Ce3+/Ce4+ to effectively catalyze coreactant radicals (S2O82−), leading to in-situ endogenous activation ECL reactions. The conductive N-GDY accelerated electron movement and increased the loading on the electrode surface, enhancing the exogenous excitation of the ECL signals. Leveraging the synergistic effect of the bifunctional monomer, the synthesized molecularly imprinted polymers (MIPs) ECL sensor demonstrated a wide detection range from 10 nM to 10,000 nM for IMI, with a limit of detection (LOD) of 1.37 nM, showcasing an innovative concept for the dual-source strategy of signal amplification in integrated ECL composites to analyze food and environmental hazards. [Display omitted] •Novel Tb-Ru-MOG/CeO2 exhibited unique ECL properties as MOG-derived materials.•CeO2 catalyzed S2O82− efficiently to achieve endogenous activation of ECL signal.•N-GDY accelerated electron transfer to enhance ECL signal by exogenous excitation.•Recognition performance of bifunctional monomer MIPs was excellent and stable.•The MIPs-ECL sensor has enabled sensitive and selective detection of IMI.