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Toward Flexible Metal Semiconductor Sandwich Surface-Enhanced Raman scattering (SERS) sensors Pesticide Duplex Detection
Materials & Design ( IF 7.6 ) Pub Date : 2023-03-30 , DOI: 10.1016/j.matdes.2023.111865
Shuang Xiong , Dalei Wang , Hangkai Qiu , Tao He , Chao Wang , Yueyue Wang , Chaoqing Dai , Wei Liu

The overuse of mixed pesticides poses a threat to both the ecosystem and human health, yet general pesticide detection methods are complex in terms of steps, such as the need for pretreatment and cleaning. Surface-enhanced Raman scattering (SERS) has been used for real-life trace detection of residues due to its rapid detection and ultra-high sensitivity. Here, we prepared a novel Ti3C2Tx (MXene)-noble metal hybrid flexible substrate with a layer of MXene on top of flower-like Ag nanoparticles (AgNFs), and finally grew Au nanoparticles (AuNPs) by galvanic replacement and self-reduction reactions. The limit of detection (LOD) can be as low as 2 × 10-12 M by detecting 4-mercaptobenzoic acid (4MBA). For efficient sampling, transparent and flexible platform made of polydimethylsiloxane (PDMS) were used for the extraction and detection of thiabendazole (TBZ), thiram, methyl parathion (MP) and their mixtures. Notably, the lowest concentrations detected by swabbing on the tomato surface (3.7 ng/mL, 2.8 ng/mL) were lower than the EU maximum permissible limits of pesticides on raw fruits and vegetables (4.0 mg/L, 6.33 mg/mL). This high performance Ti3C2Tx-noble metal hybrid flexible substrate offers a great advantage in the trace detection of molecules.



中文翻译:

迈向柔性金属半导体夹层表面增强拉曼散射 (SERS) 传感器农药双重检测

混合农药的过度使用对生态系统和人类健康都构成威胁,但一般的农药检测方法步骤复杂,需要预处理和清洗等。由于其快速检测和超高灵敏度,表面增强拉曼散射 (SERS) 已被用于现实生活中残留物的痕量检测。在这里,我们制备了一种新型 Ti 3 C 2 Tx (MXene)-贵金属混合柔性基板,在花状 Ag 纳米粒子 (AgNFs) 顶部有一层 MXene,最后通过电置换和自发光生长 Au 纳米粒子 (AuNPs) -还原反应。检测限 (LOD) 可低至 2 × 10 -12M 通过检测 4-巯基苯甲酸 (4MBA)。为了高效采样,使用由聚二甲基硅氧烷 (PDMS) 制成的透明且灵活的平台来提取和检测噻菌灵 (TBZ)、福美双、甲基对硫磷 (MP) 及其混合物。值得注意的是,通过擦拭番茄表面检测到的最低浓度(3.7 ng/mL、2.8 ng/mL)低于欧盟对生果蔬农药的最大允许限值(4.0 mg/L、6.33 mg/mL)。这种高性能的Ti 3 C 2 Tx-贵金属杂化柔性衬底在分子的痕量检测中具有很大的优势。

更新日期:2023-04-01
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