Abstract：
Two-dimensional layered semiconductor materials as a distinctive class of materials are comprehensively explored for widespread applications due to narrow bandgap, controllable morphology, and tunable metal cation composition. Herein, we constructed a sensing platform of surface enhanced Raman spectroscopy (SERS) by combination of nickel‑cobalt layered double hydroxide (NiCo-LDH) microurchins and plasmonic silver nanoparticles (Ag NPs) for fungicide detection of thiabendazole (TBZ). The NiCo-LDHs/Ag-NPs microcomposites consist of NiCo-LDHs microurchins having a large number of nanoneedles deposited with photoreduced Ag NPs. The SERS platform with NiCo-LDHs/Ag-NPs shows an excellent SERS performance for TBZ detection, including an ultra-low detection limit of 1.49 × 10-11 M, a sublime enhancement factor of 1.71 × 109, high uniformity, good reproducibility, and long-term storage stability. The ultrahigh SERS activity of NiCo-LDH/Ag-NPs can be attributed to strong electromagnetic enhancement in the nanoscale gaps between Ag NPs, massive charge transfer through large-area NiCo-LDH/Ag-NPs interfaces, and the synergistic action of electromagnetic and charge transfer mechanisms. Besides, the unique morphology of NiCo-LDHs/Ag-NPs microcomposite provides a broad surface area for adsorption of TBZ molecules for further Raman signal enhancement. The practicability of the proposed SERS platform is confirmed by detecting TBZ in the real samples of apple juice and river water. The exceptional self-cleaning capability of the NiCo-LDHs/Ag-NPs microcomposite with an retention rate of 81.97 % even after the fifth degradation cycle underscores its impressive sustainable reusability and cost-effectiveness. The findings in this work lay the foundation for the development of high-performance SERS platforms to ensure food safety and environmental protection.
摘要：
二维层状半导体材料作为一类独特的材料，由于带隙窄，被广泛探索，可控形态，和可调的金属阳离子组成。在这里，我们通过结合镍钴层状双氢氧化物（NiCo-LDH）微海胆和等离子体银纳米颗粒（AgNPs）构建了表面增强拉曼光谱（SERS）传感平台，用于噻菌灵（TBZ）的杀菌剂检测。NiCo-LDHs/Ag-NP微复合材料由NiCo-LDHs微胆组成，该微胆具有大量沉积有光还原AgNP的纳米针。具有NiCo-LDHs/Ag-NP的SERS平台在TBZ检测方面表现出优异的SERS性能，包括1.49×10-11M的超低检测限，1.71×109的崇高增强因子，高均匀性，重现性好,和长期储存稳定性。NiCo-LDH/Ag-NP的超高SERS活性可归因于AgNP之间纳米级间隙中的强电磁增强，通过大面积NiCo-LDH/Ag-NP界面的大量电荷转移，以及电磁和电荷转移机制的协同作用。此外,NiCo-LDHs/Ag-NP微复合材料的独特形态为TBZ分子的吸附提供了广阔的表面积，以进一步增强拉曼信号。通过检测苹果汁和河水的实际样品中的TBZ，证实了所提出的SERS平台的实用性。即使在第五个降解周期之后，NiCo-LDHs/Ag-NP微复合材料的出色自清洁能力仍具有81.97％的保留率，这突显了其令人印象深刻的可持续可重用性和成本效益。这项工作的发现为开发高性能SERS平台以确保食品安全和环境保护奠定了基础。
