From simulation to experiment: A Sagnac interference-based double holes optical fiber sensor for ultrasensitive Cu(II) detection

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2025-08-01 Epub Date: 2025-03-28 DOI:10.1016/j.snb.2025.137692

Qiang Chen , Yi Cai , Tianyu Jiang , Qing Chen , Jianhua Wang , Yong Zhao

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Abstract

Double-hole optical fiber (DHF) exhibits considerable potential for sensing applications due to its distinctive structural characteristics. In this study, a Sagnac interference (SI) optical fiber sensor based on a corroded DHF shows high refractive index (RI) sensitivity, allowing for the detection of copper ions, Cu(II), at very low concentrations. The dependence of DHF corrosion on the birefringence and RI sensitivity are investigated by the optical simulation. Experimental results illustrate that the RI sensitivity reaches 3267 nm/RIU within the range of 1.3333–1.3743, exhibiting good linearity. A chitosan derivative (CSD) with ion-imprinted (IIM) treatment is coated on the surface of the corroded DHF for Cu(II) detection. It is demonstrated that within the concentration range of Cu(II) from 10⁻¹⁵ to 10⁻⁶ M, both the maximum and average sensitivities can reach 12.08 × 10⁹ and 129.96 nm/μM, respectively, without interference from other metal ions or temperature (25.3–44.0 ℃). The proposed corroded DHF sensor is a good candidate for RI and Cu(II) concentration detection due to its simple structure, high sensitivity, and selectivity.

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从模拟到实验：一种基于Sagnac干涉的双孔光纤传感器，用于超灵敏的Cu（II）检测

双孔光纤（DHF）由于其独特的结构特点，在传感应用方面表现出相当大的潜力。在这项研究中，基于腐蚀DHF的Sagnac干涉（SI）光纤传感器显示出高折射率（RI）灵敏度，允许在非常低的浓度下检测铜离子Cu（II）。通过光学模拟研究了DHF腐蚀对双折射和RI灵敏度的依赖关系。实验结果表明，在1.3333 ~ 1.3743范围内，RI灵敏度达到3267 nm/RIU，线性良好。采用离子印迹（IIM）处理的壳聚糖衍生物（CSD）涂覆在腐蚀的DHF表面，用于检测Cu（II）。结果表明，在Cu（II）浓度为10−15 ~ 10−6 M的范围内，最大和平均灵敏度分别可达12.08 × 109和129.96 nm/μM，不受其他金属离子和温度（25.3 ~ 44.0 ℃）的干扰。该腐蚀DHF传感器结构简单，灵敏度高，选择性好，是检测RI和Cu（II）浓度的理想选择。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.