Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, China.
Nanoscale. 2017 Jun 29;9(25):8879-8888. doi: 10.1039/c7nr01891f.
Interfacial self-assembly of ordered nanostructures at oil-water interfaces towards the fabrication of nanofilms has attracted the interest of plenty of scientists, since its discovery in 2004. Herein, further developments have been achieved, and we report a new strategy for the synthesis of a three-dimensional (3D) hierarchical nanostructure, through an interfacial synthesis driven microemulsion process. Thus, the synthesis route has been simplified, with the rigorous experimental conditions of traditional compositing technology. Combined with a two-step seed-mediated growth method for preparing uniform Ag-NPs, a plasmonic 3D MoS-NS@Ag-NP nanostructure was successfully developed as a Surface-Enhanced Raman Scattering (SERS) active substrate, with plenty of surface hot spots, leading to an enhancement factor (EF) of 1.2 × 10 derived from both electromagnetic mechanism (EM) and chemical mechanism (CM) effects. The 3D MoS-NS@Ag-NP nanostructure can be applied to detect trace thiram in apple juice and local lake water, with a detection limit as low as 10 ppb (42 nM), which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Furthermore, quantitative analysis was achieved in the range of 10 ppb-1 ppm with good homogeneity and selectivity.
界面自组装有序纳米结构在油水界面上制造纳米薄膜已经引起了许多科学家的兴趣，自 2004 年发现以来。在此，我们通过界面合成驱动的微乳液工艺实现了一种合成三维（3D）分层纳米结构的新策略。因此，与传统复合技术的严格实验条件相比，该合成路线得到了简化。结合两步种子介导生长法制备均匀的 Ag-NPs，成功开发了等离子体 3D MoS-NS@Ag-NP 纳米结构作为表面增强拉曼散射（SERS）活性基底，具有大量的表面热点，导致增强因子（EF）为 1.2×10，这是来自电磁机制（EM）和化学机制（CM）效应。3D MoS-NS@Ag-NP 纳米结构可用于检测苹果汁和当地湖水痕量福美双，检测限低至 10 ppb（42 nM），远低于美国环境保护署（EPA）规定的水果中 7 ppm 的最大残留限量（MRL）。此外，在 10 ppb-1 ppm 的范围内实现了定量分析，具有良好的均一性和选择性。
