Dynamic structural transformation of Ce-based bimetallic MOFs via kinetic trapping for enhanced pesticide residue sensing

Authors:
  • WWWeiyu Wang
    Weiyu Wang
  • DSDandan Song
    Dandan Song
  • HWHeyang Wang
    Heyang Wang
  • BLBingbing Liu
    Bingbing Liu
  • NCNini Cheng
    Nini Cheng
  • XXXiuyuan Xing
    Xiuyuan Xing
  • MHMuxuan Huang
    Muxuan Huang
  • XLXiong Lu
    Xiong Lu
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Abstract
Crystalline metal–organic framework (MOF) materials with well-ordered structures enable precise surface engineering and a high degree of reproducibility. Nevertheless, the inherent rigidity and stability of crystalline lattices make it difficult to generate abundant surface defects and active sites. Conversely, amorphous MOF materials feature short-range order architectures with numerous disordered regions, dangling bonds, sufficient active sites and defects, thereby positioning them as a promising alternative for advanced functional design. Herein, amorphous CeM-MOF (M = Ni, Mn, Co) with spindle-shaped nanosheet architecture was precisely synthesized via shear-driven kinetic trapping strategy and employed as an advanced sensing material. Compared with the crystalline MOF (cCeCo-MOF), the amorphous MOF (aCeCo-MOF) with larger electroactive surface area, enhanced electron transfer capacity, sufficient surface defects as well as immobilization sites for enzyme, collectively boost interfacial reaction kinetics and sensing performance. The constructed aCeCo-MOF-based sensor achieves ultra-low detection limits of 28 fM for methamidophos and 3.9 fM for methyl parathion. Furthermore, the platform’s practical applicability was validated by detecting pesticide residues in agricultural products and water samples with satisfactory recoveries of 93.4% ~ 107.1%. This rationally designed amorphous bimetallic MOF-based biosensor for ultra-sensitive monitoring of pesticides holds promise for future whole-chain rapid monitoring in food safety research.

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