Escherichia coli fiber sensor based on modified graphene coated fiber Mach-Zehnder interference

被引：0
|
作者：
Peng Z.-Q. [1 ,2 ]
Liao J. [1 ]
Li Y.-J. [3 ]
Feng W.-L. [1 ,2 ]
Yang X.-Z. [1 ,2 ]
机构：
[1] School of Physics and Energy, College of Science, Chongqing University of Technology, Chongqing
[2] Chongqing Key Laboratory of Green Energy Materials Technology and Systems, Chongqing
[3] Sixth Affiliated Hospital Sun Yat-sen University, Guangzhou
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2020年 / 28卷 / 02期
关键词：
Escherichia coli; Graphene; Mach-Zehnder interference; Optical fiber sensor; Surface modification;
D O I：
10.3788/OPE.20202802.0296
中图分类号：
学科分类号：
摘要：
To solve increasingly serious food safety problems, especially the rapid detection of food-borne viruses, an E. coli sensor based on the surface-modified graphene enlarged-cone Mach-Zehnder interference structure was proposed in this study. First, a 4 cm solid photonic crystal fiber was intercepted and coarsely fused with two single-mode fibers to form an interference structure based on the Mach-Zehnder principle. Next, surface-modified graphene sensitive material was prepared. The modified graphene, coated on the surface of the solid photonic crystal fiber, allowed the sensor to have a higher sensitivity to E. coli solutions. Finally, the above sensor is placed in a water tank to detect the concentration of the E. coli. The experimental results show that the interference spectrum of the sensor has a significant blue shift with a sensitivity of 3.43 pm/(cfu•mL-1) in the range of 50-600 cfu/mL of the E. coli solution. The linearity between the bacterial concentration and wavelength shift is 0.956 49, detection limit is 67.18 cfu/ml, and response time is 15 s. The sensor has low cost, small volume, fast response time, and is suitable for the rapid detection of low concentration E. coli. © 2020, Science Press. All right reserved.
引用
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页码：296 / 302
页数：6
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