Abstract

A novel surface plasmon resonance (SPR)-based fiber optic arsenic [As (III)] sensor is presented using $\alpha \text{-}{\mathrm{Fe}}_2{\mathrm{O}}_3/{\mathrm{SnO}}_2$ core-shell nanostructure [abbreviated as ($\alpha \text{-}\mathrm{Fe}/\mathrm{Sn}$) CS] synthesized using hydrolysis. Due to its extraordinary properties, such as very large surface area, great adsorption capabilities, and chemical reactivity, $\alpha \text{-}{\mathrm{Fe}}_2{\mathrm{O}}_3$ nanoparticles offer excellent sensitivity and selectivity for As (III), while ${\mathrm{SnO}}_2$ shows great catalytic properties. To achieve the best sensing performance, the ($\alpha \text{-}\mathrm{Fe}/\mathrm{Sn}$) CS is synthesized at different temperatures, and its morphological study is carried out using transmission electron microscopy. The performance of the probe fabricated over the silver-coated unclad core of the fiber with optimized fabrication temperature and attachment time of ($\alpha \text{-}\mathrm{Fe}/\mathrm{Sn}$) CS is investigated for 0–100 μg/L concentration of As (III). The sensor possesses the limit of detection of 0.47 μg/L. Further, the roles of common interferands in sensor performance are investigated. The sensor possesses the advantages of real-time detection, capability of remote sensing, and online monitoring, which uphold its industrial application.

© 2018 Optical Society of America

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