一种聚苯胺膜微纳光纤氢离子浓度探针  

A Polyaniline Membrane Micro-nano Fiber Hydrogen Ion Probe

作　　者：顾星晨 李丽君 马茜 孙佳佳 李敏 邵常升 吕钰梦 GU Xingchen;LI Lijun;MA Qian;SUN Jiajia;LI Min;SHAO Changsheng;LU Yumeng(College of Electronic Information Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学电子信息工程学院,山东青岛266590

出　　处：《光子学报》2021年第5期166-173,共8页Acta Photonica Sinica

基　　金：山东省自然科学基金项目(Nos.ZR2009AM017,ZR2013FM019);中国博士后特别资助项目(No.200902574);中国博士后面上资助项目(No.20080441150);山东省教育厅项目(No.J06P14);煤矿安全与控制国家重点实验室开放基金项目(No.MDPC20160)。

摘　　要：提出了一种聚苯胺膜微纳光纤液体氢离子浓度探针,并研究了该光纤探针的氢离子浓度传感特性。传感部分由单模光纤-小芯径光纤-单模光纤对芯熔接而成,聚苯胺材料作为敏感膜涂覆于小芯径光纤。首先,对光纤探针传感原理和聚苯胺主链结构变化机理进行理论分析;然后,通过氢离子浓度传感实验进行验证并分析不同膜厚对光纤探针传感特性的影响;最后,完成液体折射率变化实验干扰测试,并评价探针响应-恢复时间和稳定性能。实验结果表明:在氢离子的作用下聚苯胺主链结构发生改变,光纤探针干涉光谱随氢离子浓度增大向短波方向漂移,检测范围随着聚苯胺膜厚增大而增大,但灵敏度与线性度均有明显下降;氢离子浓度范围在10^(-6)~10^(-1)mol/L时,光纤探针灵敏度为-15.74 nm/mol/L,响应与恢复时间分别为25 s和35 s。实验验证了聚苯胺膜与氢离子反应后的光学性质变化,同时也为液体氢离子浓度检测提供了一种新的方法。该光纤氢离子浓度探针还具有固膜强度高、制作简单和成本低等优点。A polyaniline film micro-nano optical fiber liquid hydrogen ion concentration probe is proposed,and the hydrogen ion concentration sensing characteristics of this fiber probe are investigated.The sensing part consists of a single-mode fiber,a small-core-diameter fiber and a single-mode fiber pair fusion spliced together,and polyaniline material is coated on the small-core-diameter fiber as a sensitive film.Firstly,a theoretical analysis of the sensing principle of the fiber optic probe and the structure change mechanism of the polyaniline main chain was conducted.Then,the effect of different film thicknesses on the sensing characteristics of the fiber optic probe was verified and analyzed by hydrogen ion concentration sensing experiments.Finally,experimental interference tests on the change of liquid refractive index were completed and the response-recovery time and stability performance of the probe were evaluated.The experimental results show that the main chain structure of polyaniline changes under the action of hydrogen ions.The interference spectrum of the fiber optic probe drifts in the short-wave direction with the increase of hydrogen ion concentration,and the detection range increases with the rise of polyaniline film thickness,while the sensitivity and linearity decrease significantly.The sensitivity of the fiber optic probe is-15.74 nm/mol/L for the hydrogen ion concentration range of 10^(-6)~10^(-1)mol/L,and the response and recovery time are 25 s and 35 s,respectively.The experiments verify the change of polyaniline film’s optical properties after reacting with hydrogen ions and provide a new method for liquid hydrogen ion concentration detection.This fiber optic hydrogen ion concentration probe also has the advantages of high concrete film strength,simple fabrication,and low cost.

关 键 词：光纤探针 微纳光纤 光学性质 聚苯胺膜 氢离子浓度 

分 类 号：TN209[电子电信—物理电子学]