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<p>A visible-light-powered photoelectrochemical (PEC) sensor was devised for chlorpyrifos (CPs) determination&#xa0; using metallic Bi-decorated BiVO<sub>4</sub> nanosheets (Bi@BiVO<sub>4</sub> NSs) with localized surface plasmon resonance (SPR) synthesized&#xa0;via a one-step hydrothermal method. It was observed that Bi@BiVO<sub>4</sub>-based PEC sensors exhibit significantly enhanced PEC responses over pristine BiVO<sub>4</sub> due to the collaborative effect of metallic Bi’s SPR phenomenon and BiVO<sub>4</sub>’s visible-light-driven properties. Furthermore, the addition of CPs selectively suppresses the&#xa0;photocurrent signal of the sensor due to the in-situ formation of Bi-CPs complexes, which hindered electron transfer through specific chelation reactions between Bi sites and CPs. The designed PEC sensor achieved high-sensitivity detection of CPs, with a linear concentration range from 0.02 to 20 ppb and a detection limit of&#xa0; 0.01 ppb. These attributes&#xa0; may&#xa0;offer a blueprint for developing diverse PEC sensing systems to monitor various environmental pesticide contaminants like CPs by synergistic integration of visible-light-responsive BiVO<sub>4</sub> and SPR-active metallic Bi.</p> Graphical Abstract <p></p>

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Metallic Bi-decorated BiVO4 nanosheets enabling improved photoelectrochemical detection of trace chlorpyrifos under visible light through localized surface plasmon resonance

  • 期刊论文

  • 发表日期：

    2025年10月12日

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  • Luping Feng,
  • Xinfeng Li,
  • Jianghong Wang,
  • Enjun Chen,
  • Yujie Fan,
  • Leyao Jin,
  • Peisong Tang,
  • Lixiang Zhang

摘要

A visible-light-powered photoelectrochemical (PEC) sensor was devised for chlorpyrifos (CPs) determination  using metallic Bi-decorated BiVO4 nanosheets (Bi@BiVO4 NSs) with localized surface plasmon resonance (SPR) synthesized via a one-step hydrothermal method. It was observed that Bi@BiVO4-based PEC sensors exhibit significantly enhanced PEC responses over pristine BiVO4 due to the collaborative effect of metallic Bi’s SPR phenomenon and BiVO4’s visible-light-driven properties. Furthermore, the addition of CPs selectively suppresses the photocurrent signal of the sensor due to the in-situ formation of Bi-CPs complexes, which hindered electron transfer through specific chelation reactions between Bi sites and CPs. The designed PEC sensor achieved high-sensitivity detection of CPs, with a linear concentration range from 0.02 to 20 ppb and a detection limit of  0.01 ppb. These attributes  may offer a blueprint for developing diverse PEC sensing systems to monitor various environmental pesticide contaminants like CPs by synergistic integration of visible-light-responsive BiVO4 and SPR-active metallic Bi.

Graphical Abstract