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An optical fiber Nickel ions (Ni2+) sensor based on a Mach-Zehnder interferometer (MZI) 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...
Nickel ions (Ni2+) probe with enhanced sensitivity is experimentally demonstrated by using a normal fiber Bragg grating (FBG) cascaded with functionalized fiber tip. Bilayers of chitosan/poly acrylic acid is functionalized directly onto the cleaved fiber tip via layer by layer assembly. When the Ni2+ is absorbed onto the bilayers, the Fresnel reflectivity of the fiber tip, which forms the noise in...
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