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<p> A novel MXene nanosheet-supported Fe₃O₄@Ag nanozyme, designed for the dual-mode colorimetric and surface-enhanced Raman scattering (SERS) detection of the pesticide thiram in fruits is presented. The composite ingeniously integrates three key functions: magnetic enrichment, SERS signal amplification, and peroxidase-like nanozyme activity. The resulting nanozyme sensor demonstrates high sensitivity and specificity for thiram detection. The colorimetric method showed a linear range of 0.05 µM to 30 µM with a LOD of 0.016 µM, while the SERS method exhibited a linear range of 10<sup>− 4</sup> M to 10<sup>− 8</sup> M with a LOD of 3.44 × 10<sup>− 9</sup> M. This performance satisfies the demands for agricultural safety monitoring. The present work highlights the significant potential of the developed colorimetric-SERS dual-mode nanozyme platform for on-site pesticide residue determination&#xa0;.</p> Graphical Abstract <p></p>

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A colorimetric-SERS sensor based on MXene nanosheets loaded with Fe3O4@Ag nanoparticles is used for sensitive and reliable detection of thiram

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Yuqing Wang,
  • Yutong Liu,
  • Ziqi Liu,
  • Xinyue Wang,
  • Menglu Yu,
  • Guanghui Gao,
  • Yunli Zhao,
  • Jing Hong

摘要

A novel MXene nanosheet-supported Fe₃O₄@Ag nanozyme, designed for the dual-mode colorimetric and surface-enhanced Raman scattering (SERS) detection of the pesticide thiram in fruits is presented. The composite ingeniously integrates three key functions: magnetic enrichment, SERS signal amplification, and peroxidase-like nanozyme activity. The resulting nanozyme sensor demonstrates high sensitivity and specificity for thiram detection. The colorimetric method showed a linear range of 0.05 µM to 30 µM with a LOD of 0.016 µM, while the SERS method exhibited a linear range of 10− 4 M to 10− 8 M with a LOD of 3.44 × 10− 9 M. This performance satisfies the demands for agricultural safety monitoring. The present work highlights the significant potential of the developed colorimetric-SERS dual-mode nanozyme platform for on-site pesticide residue determination .

Graphical Abstract