Sun Hang, Zeng Shan, Shang Yinxing, He Qinrong
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin 130022, P. R. China.
J Nanosci Nanotechnol. 2018 Feb 1;18(2):1097-1102. doi: 10.1166/jnn.2018.13962.
Developing an effective and reliable method for trace arsenic (As) detection is a prerequisite for improving the safety of drinking water. In this paper, we designed and prepared Ag@Fe3O4 core-shell nanoparticles (NPs), which were then used as Surface-Enhanced Raman Scattering (SERS) probe for trace arsenate (As(V)) detection. The Ag@Fe3O4 core-shell NPs were prepared by in situ growth of Fe3O4 NPs on the surface of AgNPs, which can effectively combine the strong adsorption ability of Fe3O4 nanoshells to As(V) with high SERS activity of Ag nanocores to decrease the detection limit. By use of Ag@Fe3O4 core-shell NPs for As(V) detection, the detection limit can be as low as 10 μg/L, and a good linear relationship between the SERS intensity of As(V) and their concentrations in the range from 10 to 500 μg/L was achieved. Furthermore, Ag@Fe3O4 core-shell NPs could be regenerated through desorption of As(V) from Fe3O4 nanoshells in NaOH solution, and then used for recyclic SERS detection. Therefore, it has been demonstrated for the first time that multifunctional Ag@Fe3O4 core-shell SERS probe could be applied to realize the highly sensitive and reversible detection of As(V).
开发一种有效且可靠的痕量砷（As）检测方法是提高饮用水安全性的前提条件。在本文中，我们设计并制备了Ag@Fe3O4核壳纳米颗粒（NPs），然后将其用作表面增强拉曼散射（SERS）探针用于痕量砷酸盐（As(V)）检测。Ag@Fe3O4核壳纳米颗粒是通过在AgNP表面原位生长Fe3O4纳米颗粒制备而成，它能有效地将Fe3O4纳米壳对As(V)的强吸附能力与Ag纳米核的高SERS活性结合起来，以降低检测限。通过使用Ag@Fe3O4核壳纳米颗粒检测As(V)，检测限可低至10μg/L，并且在10至500μg/L范围内As(V) 的SERS强度与其浓度之间实现了良好的线性关系。此外，Ag@Fe3O4核壳纳米颗粒可以通过在NaOH溶液中使As(V)从Fe3O4纳米壳上解吸来再生，然后用于循环SERS检测。因此，首次证明了多功能Ag@Fe3O4核壳SERS探针可用于实现对As(V)的高灵敏度和可逆检测。
