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

Zhi-qing PENG; Jie LIAO; Yu-jie LI; Wen-lin FENG; Xiao-zhan YANG

doi:10.3788/OPE.20202802.0296

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

Modern Applied Optics | 更新时间：2020-07-16

- Escherichia coli fiber sensor based on modified graphene coated fiber Mach-Zehnder interference
- Optics and Precision Engineering Vol. 28, Issue 2, Pages: 296-302(2020)
- 作者机构：
  
  1.重庆理工大学理学院物理与能源系, 重庆 400054
  2.绿色能源材料技术与系统重庆市重点实验室, 重庆 400054
  3.中山大学附属第六医院, 广东广州 510665
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20202802.0296
  CLC： TN253
- Received：25 June 2019，
  
  Revised：20 August 2019，
  
  Accepted：20 August 2019，
  
  Published：15 February 2020
- 稿件说明：
移动端阅览
Zhi-qing PENG, Jie LIAO, Yu-jie LI, et al. Escherichia coli fiber sensor based on modified graphene coated fiber Mach-Zehnder interference[J]. Optics and precision engineering, 2020, 28(2): 296-302.
DOI：

Zhi-qing PENG, Jie LIAO, Yu-jie LI, et al. Escherichia coli fiber sensor based on modified graphene coated fiber Mach-Zehnder interference[J]. Optics and precision engineering, 2020, 28(2): 296-302. DOI： 10.3788/OPE.20202802.0296.

摘要

针对日益严峻的食品安全问题，特别是食源性致病菌的快速检测，本文提出一种基于表面改性石墨烯粗锥型马赫-曾德尔干涉结构的光纤大肠杆菌传感器。首先，截取一根4 cm的实心光子晶体光纤，两端分别与两根单模光纤进行粗锥熔接，形成基于马赫-曾德尔干涉原理的传感结构；接着，制备一种表面改性石墨烯敏感材料，将它涂覆在实心光子晶体光纤的表面，使传感器对大肠杆菌溶液有较高的灵敏度；最后，将上述传感器置于水槽中，以此检测大肠杆菌溶液浓度。实验结果表明，在大肠杆菌溶液浓度为50~600 cfu/mL内，随着菌液的浓度增大，传感器的干涉光谱发生了明显的蓝移，灵敏度为3.43 pm/(cfu·mL

-1

)，菌液浓度与波长偏移的线性度为0.956 49，检测限为67.18 cfu/mL，响应时间为15 s。该传感器成本低、体积小、响应时间快，适用于低浓度大肠杆菌浓度的快速检测。

Abstract

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

关键词

Keywords

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