Highly Sensitive Optical Fiber MZI Sensor for Specific Detection of Trace Pb2+ Ion Concentration

被引:2
|
作者
Zhang, Lijie [1 ]
He, Hongbin [2 ]
Zhang, Shangpu [3 ,4 ]
Xiong, Yanling [1 ]
Pan, Rui [3 ,4 ]
Yang, Wenlong [3 ,4 ]
机构
[1] Jilin Univ, Coll Construct Engn, Changchun 130021, Peoples R China
[2] Heilongjiang Prov Flood & Drought Disaster Prevent, Harbin 150001, Peoples R China
[3] Harbin Univ Sci & Technol, Heilongjiang Prov Key Lab Laser Spect Technol & Ap, Harbin 150080, Peoples R China
[4] Harbin Univ Sci & Technol, Sch Measurement & Commun Engn, Harbin 150080, Peoples R China
基金
国家重点研发计划;
关键词
optical fiber sensor; bullet-shaped hollow cavity; trace Pb2+ ion concentration; specific detection; highly sensitive; AQUEOUS-SOLUTIONS; SPECTROMETRY; MERCURY;
D O I
10.3390/photonics11070631
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A novel chitosan (CS) functionalized optical fiber sensor with a bullet-shaped hollow cavity was proposed in this work for the trace concentration of Pb2+ ion detection in the water environment. The sensor is an optical fiber Mach-Zehnder interferometer (MZI), which consists of a sequentially spliced bullet-shaped hollow-core fiber (HCF), thin-core fiber, and another piece of spliced bullet-shaped HCF. The hollow-core fiber is caused to collapse by adjusting the amount of discharge to form a tapered hollow cavity with asymmetric end faces. The bullet-like hollow cavities act as beam expanders and couplers for optical fiber sensors, which were symmetrically spliced at both ends of a section of thin core fiber. The simulation and experiments show that the bullet-like hollow-core tapered cavity excites more cladding modes and is more sensitive to variation in the external environment than the planar and spherical cavities. The ion-imprinted chitosan (IIP-CS) film was fabricated with Pb2+ ion as a template and uniformly coated on the surface for specific recognition of Pb2+. Experimental verification confirms that the developed sensor can achieve high-sensitivity Pb2+ ion detection, with a sensitivity of up to -12.68 pm/ppm and a minimum Pb2+ ion detection concentration of 5.44 ppb Meanwhile, the sensor shows excellent selectivity, repeatability, and stability in the ion detection process, which has huge potential in the direction of heavy metal ion detection in the future.
引用
收藏
页数:14
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