State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China.
State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China; Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin, 300300, China.
Talanta. 2020 Apr 1;210:120631. doi: 10.1016/j.talanta.2019.120631. Epub 2019 Dec 9.
Quantitative analysis of organic pollutants in environmental water is an important issue for ecological environment and human health. In this paper, the quantitative analysis of rhodamine 6G (R6G) and p-nitrophenol (PNP) is performed by the surface enhanced Raman scattering (SERS) technology. The enhancement of Raman signals is achieved on the surface of an electrochemically roughened nano-Au film. The SERS performance depends on the microstructure of roughened nano-Au films, which is affected by the thickness of Au films and electrochemical roughening parameters. The structure-dependence of SERS performance is validated by finite element simulation of local electromagnetic field distribution. An obvious SERS effect of R6G with an enhancement factor of 10 is obtained on the roughened nano-Au film. A sensitive SERS detection of R6G with a linear range of 10-10 M and a detection limit of 10 M is realized. Moreover, a wide linear range of 10-10 M is obtained for the detection of PNP. The roughened nano-Au film is an effective substrate for the SERS detection of organic pollutants with high reproducibility and good stability. Therefore, the electrochemical technology in this study is expected to be a very promising method for the fabrication of high-performance SERS substrate.
环境水中有机污染物的定量分析是生态环境和人类健康的重要问题。本文采用表面增强拉曼散射（SERS）技术对罗丹明 6G（R6G）和对硝基苯酚（PNP）进行定量分析。在电化学粗糙化的纳米金膜表面实现了拉曼信号的增强。SERS 性能取决于粗糙化纳米金膜的微观结构，这受到金膜厚度和电化学粗糙化参数的影响。通过局部电磁场分布的有限元模拟验证了 SERS 性能的结构依赖性。在粗糙化的纳米金膜上获得了 R6G 的明显 SERS 效应，增强因子为 10。实现了 R6G 的灵敏 SERS 检测，线性范围为 10-10 M，检测限为 10 M。此外，还获得了 PNP 的 10-10 M 的宽线性范围。粗糙化的纳米金膜是用于具有高重现性和良好稳定性的有机污染物的 SERS 检测的有效基底。因此，本研究中的电化学技术有望成为制造高性能 SERS 基底的非常有前途的方法。
