Ag/CeO2 纳米结构修饰的高稳定性 SERS 底物的高效和可调谐形状选择性合成用于苹果表面农药的超灵敏检测,Nanoscale Advances

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Ag/CeO2 纳米结构修饰的高稳定性 SERS 底物的高效和可调谐形状选择性合成用于苹果表面农药的超灵敏检测
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-07-02 , DOI: 10.1039/d0na00390e
S Thirumalairajan ₁ , K Girija ₂

Affiliation

果蔬农药残留检测对保障人类健康和环境安全具有重要意义。_{对作为活性柔性 SERS 基底的 Ag/CeO 2}纳米结构进行了有效且可调谐的形状选择性合成，用于通过粘贴、剥离和再次粘贴过程检测苹果表面的福美双。_{通过形态学和晶体学分析证实了银组装的 CeO 2}微球的良好控制形成，这些微球构成平均尺寸约为 56 和 32 nm 且具有各向异性结构的纳米球和纳米纺锤体。有趣的是，CeO ₂（111）强烈锚定在Ag（111）基质中，从结构和化学成分分析中观察到，这为快速离子电子传输提供了更充分的途径。使用我们提出的纳米纺锤 SERS 活性基板在苹果表面检测福美双，实现了从 10 ^-2到 10 ^-9 M 的宽检测范围，相关系数为 0.9929，在 S/N = 时检测限低至 27 nM 3. 此外，还提出了Ag/CeO _{2纳米结构与福美双分子之间的电荷转移机制。}我们相信，目前的工作可以提供新的方法来开发 SERS 活性底物，以便在不久的将来高效现场检测水果上的农药。

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Efficient and tunable shape selective synthesis of Ag/CeO2 nanostructures modified highly stable SERS substrate for ultrasensitive detection of pesticides on the surface of an apple

Detection of pesticide residues from fruits and vegetables is of significant importance to ensuring human health and environmental safety. An efficient and tunable shape-selective synthesis of Ag/CeO₂ nanostructures as an active flexible SERS substrate for the detection of thiram on an apple surface via a paste, peel off, and paste again process was performed. The well-controlled formation of silver assembled CeO₂ microspheres constituting nanospheres and nanospindles with an average size of approximately 56 and 32 nm with anisotropic structures has been confirmed through morphological and crystallographic analysis. Interestingly, CeO₂ (111) was strongly anchored in the Ag (111) matrix, which provides a more adequate pathway for rapid ion-electron transportation, as observed from the structural and chemical composition analysis. The detection of thiram on the surface of an apple using our proposed nanospindle SERS active substrate achieves a wide detection range from 10⁻² to 10⁻⁹ M with a correlation coefficient of 0.9929 and a low detection limit of 27 nM at S/N = 3. In addition, the charge transfer mechanism between the Ag/CeO₂ nanostructures and thiram molecules has also been proposed. We believe that the present work could provide novel ways to develop SERS active substrates for highly efficient onsite detection of pesticides on fruits in the near future.

更新日期：2020-08-11

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