Yan Minglu, Wang Ruiduo, Li Yang, Kang Xin, Zhang Zaikun, Li Yangyang, Jiang Man
State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, School of Physics, Institute of Photonics & Photon Technology, Northwest University, Xi'an 710069, People's Republic of China.
State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, People's Republic of China.
Analyst. 2023 Feb 27;148(5):1075-1084. doi: 10.1039/d2an01740g.
A highly sensitive label-free chemical sensing platform for the detection of various metal ions is demonstrated. The chemical sensor was derived from a single-mode fiber that is inserted into the ceramic tube with epoxy resin (ER) on the end face for reflecting light and forms the Fabry-Perot (F-P) interferometric cavity. Multilayer chitosan (CS)/polyacrylic acid (PAA) were coated on the surface of the epoxy resin and act as the sensitive film. Based on the analysis of the sensing principle and the F-P cavity structure, the parameters were numerically simulated and experimentally evaluated, which enables ease of fabrication and real-time modulation of the cavity length. The sensitivity of sensing Ni, Zn, and Na reached 9.95 × 10 nm ppb, 2.31 × 10 nm ppb, and 4 × 10 nm ppb, respectively, and the sensing results were theoretically analyzed by the Langmuir adsorption model, which corresponds to the surface atom percentage results obtained by SEM and EDS measurements for sensing three types of metal ions. The proposed ER/CS/PAA multilayer film-coated F-P sensor can be employed as a probe, which features label-free, highly sensitivity, real-time monitoring, ease of measurement, stability, and therefore provides a remarkable analytical platform for chemical applications.
展示了一种用于检测各种金属离子的高灵敏度无标记化学传感平台。该化学传感器由一根单模光纤制成，光纤插入陶瓷管中，端面用环氧树脂（ER）反射光，形成法布里-珀罗（F-P）干涉腔。多层壳聚糖（CS）/聚丙烯酸（PAA）涂覆在环氧树脂表面，作为敏感膜。基于对传感原理和F-P腔结构的分析，对参数进行了数值模拟和实验评估，这使得腔长易于制造和实时调制。检测Ni、Zn和Na的灵敏度分别达到9.95×10 nm/ppb、2.31×10 nm/ppb和4×10 nm/ppb，并用朗缪尔吸附模型对传感结果进行了理论分析，这与通过扫描电子显微镜（SEM）和能谱仪（EDS）测量三种金属离子的表面原子百分比结果相对应。所提出的ER/CS/PAA多层膜涂覆的F-P传感器可作为探针，具有无标记、高灵敏度、实时监测、易于测量、稳定性好等特点，因此为化学应用提供了一个卓越的分析平台。
