Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7141089 | Sensors and Actuators B: Chemical | 2018 | 18 Pages |
Abstract
Chloride erosion is the main factor to decrease durability of concrete, it is fairly important to control and monitor chloride in concrete structure. A new sensor based on a suspended core optical fiber was developed to detect the chloride in concrete, in which lucigenin is selected as a fluorescence sensitive material for chloride. A novel type of the sol-gel membrane was introduced to immobilize lucigenin onto the inner wall of the suspended core optical fiber with dip-coating method. The properties of the sol-gel membrane were characterized by scanning electron microscope (SEM) and Fourier transforming infrared (FT-IR), and energy of evanescent field the suspended core optical fiber was calculated by using COMSOL. The fluorescence fluctuations of the optic fiber sensor are chloride concentration-dependent and the relationship between relative fluorescence intensity and chloride concentration follows the Stern-Volmer equation. The linear calibration formulas I0/Iâ¯=â¯1â¯+â¯1.463[Clâ] (R2â¯=â¯0.973) and I0/Iâ¯=â¯1â¯+â¯1.982[Clâ] (R2â¯=â¯0.984) with the detection limit of 0.02 M are obtained through detecting standard KCl solution and concrete simulated pore solution of KCl (pHâ¯=â¯13.5), respectively. Besides, specificity of the sensor is also tested.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Liyun Ding, Zhijie Li, Qingjun Ding, Xiang Shen, Yinquan Yuan, Jun Huang,