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<p>Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg<sup>2+</sup>) to metallic mercury (Hg<sup>0</sup>), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg<sup>2+</sup> in grains. The detection limits were as low as 0.005&#xa0;μg·L<sup>−1</sup> for Hg<sup>2+</sup> and 0.006&#xa0;μg·L<sup>−1</sup> for FB1.</p> Graphical abstract <p></p>

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A SERS “on–off” sensor for Hg2+ and fumonisin B1 determination in grains based on Au-Janus Ag NPs modified by carbon dots

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Yutong Wang,
  • Xiao Liang,
  • Yaling Yang

摘要

Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg2+) to metallic mercury (Hg0), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg2+ in grains. The detection limits were as low as 0.005 μg·L−1 for Hg2+ and 0.006 μg·L−1 for FB1.

Graphical abstract