The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors and Department of Chemistry, Shanghai Normal University, Shanghai 200234, China.
Sensors (Basel). 2020 Jul 24;20(15):4120. doi: 10.3390/s20154120.
For real application, it is an urgent demand to fabricate stable and flexible surface-enhanced Raman scattering (SERS) substrates with high enhancement factors in a large-scale and facile way. Herein, by using the electrospinning technique, a hydrophobic and flexible poly(styrene--butadiene) (SB) fibrous membrane is obtained, which is beneficial for modification of silver nanoparticles (Ag NPs) colloid in a small region and then formation of more "hot spots" by drying; the final SERS substrate is designated as Ag/SB. Hydrophobic Ag/SB can efficiently capture heterocyclic molecules into the vicinity of hot spots of Ag NPs. Such Ag/SB films are used to quantitatively detect trace triazophos residue on fruit peels or in the juice, and the limit of detection (LOD) of 2.5 × 10 M is achieved. Ag/SB films possess a capability to resist heat. As a case, 6-mercaptopurine (6MP) that just barely dissolves in 90 °C water is picked for conducting Ag/SB-film-based experiments.
对于实际应用来说，以大规模且简便的方式制造具有高增强因子的稳定且灵活的表面增强拉曼散射（SERS）基底是一个迫切的需求。在此，通过使用静电纺丝技术，得到了疏水性且灵活的聚（苯乙烯-丁二烯）（SB）纤维膜，这有利于在小区域内修饰银纳米粒子（Ag NPs）胶体，然后通过干燥形成更多的“热点”；最终的 SERS 基底被指定为 Ag/SB。疏水性的 Ag/SB 可以有效地将杂环分子捕获到 Ag NPs 的热点附近。此类 Ag/SB 薄膜可用于定量检测果皮或果汁中的痕量三唑磷残留，检测限（LOD）达到 2.5×10 M。Ag/SB 薄膜具有抗热性能。例如，选择 90°C 水中几乎不溶解的 6-巯基嘌呤（6MP）进行基于 Ag/SB 薄膜的实验。
