Yang Nan, You Tingting, Gao Yukun, Lu Sichen, Yin Penggang
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China.
Langmuir. 2019 Apr 2;35(13):4626-4633. doi: 10.1021/acs.langmuir.8b04271. Epub 2019 Mar 20.
The present study demonstrated a one-step method for the first time to fabricate self-assembled gold nanoparticle (AuNP) metafilms at the water-toluene interface by adding polystyrene-polyisoprene-polystyrene as the support layer. The thiolated polyethylene glycol and ethanol were used to tune the surface charge density on the AuNPs, constructing a balanced situation at the water-toluene interface. The flexible (AuNP) metafilm can be easily obtained after evaporation of the toluene phase and further used as a surface-enhanced Raman scattering (SERS) substrate for trace thiram detection. The SERS sensitivity was tested using standard Raman probes such as crystal violet and malachite green, both with the detect concentration reaching 1 × 10 M. Moreover, the excellent reproducibility and elastic properties make the metafilm promising in practical detection. Hence, the trace thiram detection on an orange pericarp was inspected with the detection limit of 0.5 ppm (1 × 10 M) as well as a favorable linearity relation with a correlation coefficient of 0.979, exactly matching the realistic application requirements.
本研究首次展示了一种一步法，通过添加聚苯乙烯-聚异戊二烯-聚苯乙烯作为支撑层，在水-甲苯界面制备自组装金纳米颗粒（AuNP）超薄膜。使用硫醇化聚乙二醇和乙醇来调节金纳米颗粒的表面电荷密度，在水-甲苯界面构建一种平衡状态。甲苯相蒸发后可轻松获得柔性（AuNP）超薄膜，并进一步用作痕量福美双检测的表面增强拉曼散射（SERS）基底。使用结晶紫和孔雀石绿等标准拉曼探针测试了SERS灵敏度，检测浓度均达到1×10⁻⁸ M。此外，优异的重现性和弹性性能使该超薄膜在实际检测中具有应用前景。因此，对橙子果皮上的痕量福美双进行了检测，检测限为0.5 ppm（1×10⁻⁶ M），且具有良好的线性关系，相关系数为0.979，完全符合实际应用要求。
