Highly sensitive fiber optic enhanced Raman scattering sensor

Due to the unique optical performance of optical fibers, the detection of substrate is flexible and simple, playing a huge role in remote detection applications. The preparation of noble metal nanoparticles with good SERS performance on the optical fiber facet is a problem worth studying. In this study, the experimental method of oil water separation was used to modify silver nanoparticle (AgNPs) on the fiber facet, proving that this method can prepare fiber SERS substrates and effectively enhance Raman signals. Rhodamine 6G (R6G) solution was used as the analyte to characterize the SERS fiber matrix, and the performance of the fiber SERS substrate was studied from three aspects of the uniformity, reproducibility and stability of the fiber SERS substrate. In practical applications, fiber optic substrates were used to detect 4-ATP, which is widely used in the synthesis of pesticide intermediates. The preparation of fiber SERS substrate enables in situ and real-time detection, while using portable Raman instruments can achieve simple and rapid detection of analytes. These experimental results demonstrate that the self-assembly method provides a feasible approach for the preparation of fiber SERS substrates.

Automated summary

In this study, silver nanoparticles were modified on the facet of an optical fiber to prepare a fiber SERS substrate, which effectively enhanced Raman signals. The performance of the fiber SERS substrate was characterized in terms of uniformity, reproducibility, and stability. The experimental results demonstrated that the preparation method of the fiber SERS substrate enabled in situ and real-time detection, and portable Raman instruments could achieve simple and rapid analysis.