fig5

Figure 5. (A)The detection mechanism of “turn off” and “turn on” EESs (Reproduced with permission^[23]. Copyright 2022, Elsevier), (B) the preparation of PDDA-AuNPs-COFs (Reproduced with permission^[114]. Copyright 2024, Elsevier), (C) Ce-UiO-66-MWCNTs (Reproduced with permission^[115]. Copyright 2019, Elsevier), (D) AChE-CS-GR-ZIF-8 (Reproduced with CC BY 4.0^[118]. Copyright 2022, MDPI) EESs. ATCl: Acetylthiocholine chloride; AChE: acetylcholinesterase; COF: covalent organic framework; PBS: phosphate buffer solution; DDVP: O,O-dimethyl-O-2,2-dichlorovinylphosphate; GCE: glassy carbon electrode; Tph: 2,5-dihydroxy-1,4-phenyl dicarboxylaldehyde; Dha: 5,10,15,20-tetra(4-aminophenyl)-21H,23H-porphyrin; PDDA: poly (diallyldimethylammonium chloride); OP: organophosphorus pesticide; ZIF-8: zeolitic imidazolate framework-8; GR: graphene; ICP: isocarbophos.