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<p>An electrochemical molecularly imprinted polymer (MIP) sensor is developed for sensitive detection of bisphenol A (BPA) based on leaf-like Cu<sub>2</sub>S/activated functionalized carbon nanotubes (AFCNTs) nanocomposite as the conductive substrate. The Cu<sub>2</sub>S/AFCNTs composite shows a BET specific surface area of 24.7 m<sup>2</sup> g<sup>− 1</sup>, which is approximately eight times higher than that of the pure Cu<sub>2</sub>S (3.3 m<sup>2</sup> g<sup>− 1</sup>). This enlarged surface area contributes to abundant accessible active sites and promotes efficient electron transfer. The electroactive area of the Cu<sub>2</sub>S/AFCNTs-modified electrode is 0.40 cm<sup>2</sup> which is fivefold higher than the bare electrode (0.08 cm<sup>2</sup>). The MIP film is electropolymerized onto the composite surface with a thickness of 2.91&#xa0;nm. Mechanistic studies confirm that BPA oxidation is an adsorption-controlled irreversible process involving 2H<sup>+</sup>/2e<sup>−</sup>. Under optimized conditions, the sensor displays a broad linear range from 0.9 to 20 µM and a limit of detection of 0.19 µM with high selectivity against common interferents. The sensor also demonstrates good reproducibility (RSD 4.2%) and stability. Practical applicability is validated by determination of BPA in milk samples, with recoveries ranging from 99% to 102.1% (RSD 2.1 ~ 3.7%). This work highlights the synergistic enhancement of Cu<sub>2</sub>S and AFCNTs for constructing high-performance MIP-based electrochemical sensors for food safety monitoring.</p>

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Cu2S/AFCNTs-based MIP sensors: voltammetric mechanism for sensitive BPA detection in milk

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Xia Zhang,
  • Yizhan Sun,
  • Yingying Ben,
  • Ru Liu,
  • Shuwen Lv,
  • Yuandong Xu,
  • Peng Li

摘要

An electrochemical molecularly imprinted polymer (MIP) sensor is developed for sensitive detection of bisphenol A (BPA) based on leaf-like Cu2S/activated functionalized carbon nanotubes (AFCNTs) nanocomposite as the conductive substrate. The Cu2S/AFCNTs composite shows a BET specific surface area of 24.7 m2 g− 1, which is approximately eight times higher than that of the pure Cu2S (3.3 m2 g− 1). This enlarged surface area contributes to abundant accessible active sites and promotes efficient electron transfer. The electroactive area of the Cu2S/AFCNTs-modified electrode is 0.40 cm2 which is fivefold higher than the bare electrode (0.08 cm2). The MIP film is electropolymerized onto the composite surface with a thickness of 2.91 nm. Mechanistic studies confirm that BPA oxidation is an adsorption-controlled irreversible process involving 2H+/2e−. Under optimized conditions, the sensor displays a broad linear range from 0.9 to 20 µM and a limit of detection of 0.19 µM with high selectivity against common interferents. The sensor also demonstrates good reproducibility (RSD 4.2%) and stability. Practical applicability is validated by determination of BPA in milk samples, with recoveries ranging from 99% to 102.1% (RSD 2.1 ~ 3.7%). This work highlights the synergistic enhancement of Cu2S and AFCNTs for constructing high-performance MIP-based electrochemical sensors for food safety monitoring.