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    Detection of Ni2+ with Optical Fiber Mach-Zehnder Interferometer Coated with Chitosan/MWCNT/PAA

    Year: 2017

    Authors: Lin, Yunfeng; Dong, Xinyong; Yang, Jing; Maa, Hunlun; Zu, Peng; So, Ping Lam; Chan, Chi Chiu

    Organizations: National Natural Science Foundation of China [61475147, 61640408]; State Key Laboratory of Advanced Optical Communication Systems and Networks (Shanghai Jiao Tong University, China) [2016GZKF0JT005]; ENERGY MARKET AUTHORITY [NRF2013EWT-EIRP001-006]

    Keywords: Optical fiber sensors; Nickel ions; layer by layer technique

    An optical fiber Nickel ions (Ni2+) sensor based on a Mach-Zehnder interferometer formed by cascading two coating-functionalized fiber tapers is proposed and experimentally demonstrated. The functional coating is a multi-layer film of chitosan/muli-walled carbon nanotubes (MWCNT)/poly acrylic acid (PAA) formed directly onto the fiber surface via a layer-by-layer assembly technique. As the heavy metal ions get absorbed by the coating, transmission spectra of the MZI sensor changes due to refractive index variation of the coating. A high sensitivity of 56.5 dB/mM is achieved for concentration of Ni2+ ranging from 0.3 to 0.7 mM.