School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, P.R. China.
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun, 130103, P. R. China.
Sci Rep. 2019 Sep 25;9(1):13876. doi: 10.1038/s41598-019-50374-y.
A commercial SERS substrate does not only require strong enhancement, but also can be reused and recycled in actual application. Herein, FeO/SiO/ZnO/Ag (FSZA) have been synthesised, which consisted of FeO core with strong magnetic field response and an intermediate SiO layer as an electronic barrier to keep the stability of magnetite particles and outer ZnO and Ag as the effective layers for detecting pollutants. The SERS enhancement factor (EF) of the FSZA was ~8.2 × 10. The enhancement mechanism of the FSZA core-shell microspheres were anatomized. The electromagnetic enhancement of surface deposited Ag, charge transfer, and molecular and exciton resonances act together to cause such high enhancement factors. For practical application, the FSZA core-shell microspheres were also used to detect thiram, moreover, which was collected and separated by an external magnetic field, and maintained the SERS activity without significant decline during multiple tests. So the good enhancement performance and magnetic recyclability make the FSZA core-shell microspheres a promising candidates for practical SERS detection applications.
商用 SERS 基底不仅需要很强的增强效果，而且在实际应用中还能够重复使用和回收。在此，我们合成了 FeO/SiO/ZnO/Ag（FSZA），其由具有强磁场响应的 FeO 核以及作为电子势垒的中间 SiO 层组成，以保持磁铁矿颗粒的稳定性，外部的 ZnO 和 Ag 则作为用于检测污染物的有效层。FSZA 的 SERS 增强因子（EF）约为 8.2×10。对 FSZA 核壳微球的增强机制进行了剖析。表面沉积的 Ag 的电磁增强、电荷转移以及分子和激子共振共同作用导致了如此高的增强因子。为了实际应用，FSZA 核壳微球还被用于检测福美双，而且可以通过外加磁场进行收集和分离，在多次测试中保持了 SERS 活性，没有明显下降。因此，良好的增强性能和磁性可回收性使得 FSZA 核壳微球成为实用 SERS 检测应用的有前途的候选材料。
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