Heterostructure La0.5Sr0.5Fe0.4Mn0.6O3/TiC/porous graphene oxide for efficient trace-level detection of methiocarb pesticide in environmental samples

초록

The widespread application of methiocarb (MTC), a potent carbamate pesticide, poses significant risks to environmental and human health, necessitating highly sensitive and reliable detection strategies. Herein, we report the design and fabrication of a novel heterostructure electrode composed of La0.5Sr0.5Fe0.4Mn0.6O3 (LSFM), titanium carbide (TiC), and porous graphene oxide (PGO) for efficient trace-level electrochemical sensing of MTC. The synergistic integration of 1D LSFM nanoparticles with 2D TiC sheets and microporous PGO nanosheets creates a high conductivity network with enhanced electron and mass transport. The LSFM/TiC/PGOmodified electrode exhibits exceptional sensitivity (0.0111 mu A mu M-1 cm-2) and a remarkable limit of detection (LOD) of 6.19 nM at a 60 s chronoamperometric response, along with a wide linear range of 0.625-20.625 mu M. It also demonstrates excellent reproducibility, repeatability, long-term stability, and selectivity in the presence of common interfering substances. Importantly, the LSFM/TiC/PGO-modified sensor electrode achieves high recovery rates (93.97 %-101.40 %) in real environmental samples, including soil and water, affirming its practical applicability. This work highlights the potential of LSFM/TiC/PGO heterostructures as high-performance platforms for the electrochemical detection of pesticide residues in environmental monitoring.

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