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<p>Lanthanide metal oxides have great application potential in electrochemiluminescence sensors. In this work, Tb<sup>3+</sup> doped Eu<sub>2</sub>O<sub>3</sub> (Eu<sub>2</sub>O<sub>3</sub>: Tb<sup>3+</sup>) was used as the luminescent group. Noble metal gold nanoparticles (Au NPs) are loaded on the surface of Eu<sub>2</sub>O<sub>3</sub>: Tb<sup>3+</sup> to form Eu<sub>2</sub>O<sub>3</sub>:Tb<sup>3+</sup>@Au nanocomposites. Au NPs promoted electron transfer and generated SO<sub>4</sub><sup>•−</sup> and OH<sup>•</sup> radicals to enhance the ECL intensity of Eu<sub>2</sub>O<sub>3</sub>:Tb<sup>3+</sup>, which played a role in preliminary signal amplification. In addition, Au NPs can also improve the biocompatibility of electrode materials and facilitate the immobilization of ACE aptamer (apt) on the electrode surface. The distance between deposited silver submicro particles (Ag SMPs) and Eu<sub>2</sub>O<sub>3</sub>:Tb<sup>3+</sup>@Au was controlled by the chain length of aptamer and cDNA to ensure the occurrence of a plasmon resonance effect. The wool-like Ag SMPs further increased the ECL intensity of the sensor by about 2.5 times. The dual signal amplification electrochemiluminescence aptamer sensor prepared can be successfully used for the detection of acetamiprid (ACE). The detection range is 1 × 10<sup>–15</sup> M ~ 1 × 10<sup>− 8</sup> M, and the detection limit of the sensor is 4.46 × 10<sup>–16</sup> M (3σ/slope). The sensor was successfully applied to the analysis of actual samples.</p> Graphical abstract <p></p>

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An electrochemical sensor with dual amplification of ECL signal using Eu2O3:Tb3+ as luminescent material based on surface plasmon resonance mechanism for detecting trace acetamiprid

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Xiaoping Chang,
  • Jiajia Zhi,
  • Wenchang Wang,
  • Longmei Yao,
  • Qingyi Li,
  • Ding Jiang,
  • Xueling Shan,
  • Xiaohui Chen,
  • Guoping Yan,
  • Zhidong Chen

摘要

Lanthanide metal oxides have great application potential in electrochemiluminescence sensors. In this work, Tb3+ doped Eu2O3 (Eu2O3: Tb3+) was used as the luminescent group. Noble metal gold nanoparticles (Au NPs) are loaded on the surface of Eu2O3: Tb3+ to form Eu2O3:Tb3+@Au nanocomposites. Au NPs promoted electron transfer and generated SO4•− and OH• radicals to enhance the ECL intensity of Eu2O3:Tb3+, which played a role in preliminary signal amplification. In addition, Au NPs can also improve the biocompatibility of electrode materials and facilitate the immobilization of ACE aptamer (apt) on the electrode surface. The distance between deposited silver submicro particles (Ag SMPs) and Eu2O3:Tb3+@Au was controlled by the chain length of aptamer and cDNA to ensure the occurrence of a plasmon resonance effect. The wool-like Ag SMPs further increased the ECL intensity of the sensor by about 2.5 times. The dual signal amplification electrochemiluminescence aptamer sensor prepared can be successfully used for the detection of acetamiprid (ACE). The detection range is 1 × 10–15 M ~ 1 × 10− 8 M, and the detection limit of the sensor is 4.46 × 10–16 M (3σ/slope). The sensor was successfully applied to the analysis of actual samples.

Graphical abstract