Fiber optic surface-plasmon-resonance-based highly sensitive arsenic sensor prepared using α-Fe 2 O 3 /SnO 2 core-shell nanostructure with optimized probe parameters

A novel surface plasmon resonance (SPR)-based fiber optic arsenic [As (III)] sensor is presented using α-Fe2O3/SnO2 core-shell nanostructure [abbreviated as (α-Fe/Sn) CS] synthesized using hydrolysis. Due to its extraordinary properties, such as very large surface area, great adsorption capabilities, and chemical reactivity, α-Fe2O3 nanoparticles offer excellent sensitivity and selectivity for As (III), while SnO2 shows great catalytic properties. To achieve the best sensing performance, the (α-Fe/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 (α-Fe/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.