Abstract
The application of a noble-metal-based plasmon-enhanced substrate to detect low-concentration analytes has attracted extensive attention. Most of the substrates used in recently reported researches are based on two-dimensional structures. Hence, we prepared a higher efficiency Raman activity substrate with a filter paper structure, which not only provides more plasmonic “hot spots,” but also facilitates analyte extraction and detection due to the flexibility of the paper. The preparation of the plasmonic paper substrate adopted centrifugation to deposit the alloy nanoparticles onto the paper base. The optimal particle deposition condition was found by adjusting the centrifugal force and centrifugation time. Then, the surface-enhanced Raman spectroscopy (SERS) performance of the substrate was enhanced by altering the plasmon resonance peak on the surface of the nanoparticles. The enhancement factor of this paper-based substrate was ${1.55} \times {{1}}{{{0}}^7}$, with high detection uniformity (${{1}}{{{0}}^{- 6}}\;{\rm{M}}$, rhodamine 6G) and a low detection limit (${{1}}{{{0}}^{- 11}}\;{\rm{M}}$, rhodamine 6G). Then, we applied the SERS substrate to pesticide detection; the detection limit of the thiram reached ${{1}}{{{0}}^{- 6}}\;{\rm{M}}$. As a result, the simple and cost-effective paper-based SERS substrate obtained in this way has high detection performance for pesticides and can be used for rapid detection in the field, which is beneficial to food safety and environmental safety.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Jun Dong, Yuchong Ren, Kangzhe Zhao, Jiaxin Yuan, Qingyan Han, Wei Gao, Jihong Liu, Lipeng Zhu, Zhiyu Zhang, and Jianxia Qi
Opt. Express 31(13) 21225-21238 (2023)
Jun Dong, Kangzhe Zhao, Qianying Wang, Jiaxin Yuan, Qingyan Han, Wei Gao, Yongkai Wang, Jianxia Qi, and Mengtao Sun
Opt. Express 29(22) 36857-36870 (2021)
Ciyong Gu, Zhimin Zhao, and Pengcheng Shi
Appl. Opt. 60(3) 792-798 (2021)