Li Tao, Yu Zhinan, Wang Zhengkun, Zhu Yong, Zhang Jie
The Key Laboratory of Optoelectronic Technology & System (Ministry of Education), Chongqing University, Chongqing 400044, China.
Sensors (Basel). 2021 Mar 25;21(7):2300. doi: 10.3390/s21072300.
A tapered fiber decorated by Ag nanoparticles is prepared as a surface-enhanced Raman scattering (SERS) substrate. There are two key parameters during the preparation process, the fiber cone angle and the density of decorated AgNPs on the fiber tip surface. Their theoretical analysis on the forming mechanism and the optimization process is studied in detail. The tapered fibers with angles from 0.5 to 30° are successfully prepared, with a chemical method in a small tube using a bending interface. AgNPs with different densities are decorated on the surface of the tapered fibers with an electrostatic adsorption method. The optimized tapered fiber SERS probe with an angle of 12° and AgNPs density of 26.67% provides the detection of Rhodamine 6G (R6G) with 10 mol/L.
制备了一种由银纳米颗粒修饰的锥形光纤作为表面增强拉曼散射（SERS）基底。制备过程中有两个关键参数，即光纤锥角和光纤尖端表面修饰的AgNPs密度。详细研究了它们形成机制和优化过程的理论分析。采用化学方法在小管中利用弯曲界面成功制备了锥角为0.5°至30°的锥形光纤。通过静电吸附法在锥形光纤表面修饰了不同密度的AgNPs。优化后的锥角为12°、AgNPs密度为26.67%的锥形光纤SERS探针能够检测10 mol/L的罗丹明6G（R6G）。
