数字农科院2.0

Multifunctional Fe3O4@ZIF-8@Ag nanocomposites and electro-driven droplet adsorption strategy for SERS detection of acetamiprid

文献类型： 外文期刊

作者： Xuemei Tang;Wei Zeng;Caiying Wang;Fei Pan;Jing Wei;Long Wu

作者机构：

关键词： Adsorption kinetics;Density functional theory simulations;Food safety;Metal-organic frameworks;Molecular interactions

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 508 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Surface-enhanced Raman scattering (SERS) is strategically employed for label-free detection of trace analytes. The weak affinity of target analytes with SERS substrate and complex matrix interference impede the achievement of high sensitivity and precision necessary for practical SERS applications. Based on Fe3O4@ZIF-8@Ag substrate and the electro-driven adsorption strategy, this study develops a droplet SERS sensor for direct quantification of acetamiprid (AAP) residue. Through the internal structure of ZIF-8, AAP molecules can be adsorbed onto the “hotspot” region of Ag nanoparticles (Ag NPs) to obtain enhanced SERS signals. The magnetic substrate can simplify sample pretreatment and reduce complex matrix interference. An electric field can strengthen the van der Waals interaction between AAP and SERS interface, providing a driving force for the adsorption of AAP molecules. Compared to static adsorption in 60 min without an electric field, effective adsorption of AAP can be achieved in 7 min by applying a potential of −0.5 V. Moreover, the electro-driven SERS offers 9 times higher in sensitivity compared with that of normal SERS, with a limit of detection (LOD) down to 4 nM. This strategy is confirmed by UPLC-MS/MS analysis of AAP in real samples, demonstrating a new, simple, flexible, and sensitive SERS technique applicable for pesticide residue detection.

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