Reflective Fiber Surface Plasmon Resonance Sensor for High-Sensitive Mercury Ion Detection

Abstract

This paper proposes a reflective fiber mercury ion sensor based on the surface plasmon resonance (SPR) principle and chitosan (CS)/polyacrylic acid (PAA) multilayer sensitive film. By optimizing the coating parameters of the gold film, the refractive index (RI) sensitivity of the reflective SPR sensor is demonstrated to be 2110.33 nm/RIU. Then, a multi-layer CS/PAA film is fixed on the surface of the gold film as a mercury ion sensitive film to form a reflective SPR fiber mercury ion sensor. Experimental results demonstrate that the sensor can be used to detect different concentrations of mercury ions with a high sensitivity of 0.5586 nm/µM and good specificity and repeatability. Therefore, the reflective SPR fiber mercury ion sensor shows great promise for future applications of environmental monitoring and drinking water safety.

Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

“…The most toxic chemical forms of Hg are ionic Hg (Hg 2+ ), causes serious damage to human health such as brain damage, immune dysfunction and paralysis [ 24 , 25 , 26 ]. Therefore, the removal and detection of Hg 2+ in the aqueous environment are of great significance [ 27 , 28 , 29 , 30 , 31 ]. Among the existing optical techniques to detect Hg 2+ are colorimetric, fluorescent, chemosensor, electrochemiluminescence (ECL) and photoluminescent (PL) [ 32 , 33 , 34 ].…”

Fabrication of multi-mode tip fiber sensor based on surface plasmon resonance (SPR)

“…Depend on the same system in Kretschmann prism that associated, the SPR with fiber optic technology owns great improvements with giving advantages exceeding the common prism based SPR reaches, such as a low cost, miniaturization, and simplicity [5]. SPR fiber sensors can operate in the reflection mode (fiber tip), a sensor consisting of the fiber with a perfect cleave and a layer of gold or another plasmonic material at one end of the fiber, which reflects light towards the detector at the opposite end [6].…”

“…There are two forms of the SPR methods detection according to the resonance coupling condition given by equation ( 6) [11]: (6) dielectric function of the prism, is incident angle.…”

Thymine-Functionalized Gold Nanoparticles (Au NPs) for a Highly Sensitive Fiber-Optic Surface Plasmon Resonance Mercury Ion Nanosensor

“…The fiber-optic SPR sensor has already been used for Hg 2+ detection: Raj et al reported using a fiber-optic SPR sensor for Hg 2+ ion detection by utilizing an Au NPs–polyvinyl alcohol (PVA) hybrid as a sensing material, however, the limit of detection (LOD) was only down to 1 × 10 −6 M [ 24 ]. Taking advantage of a chitosan (CS)/polyacrylic acid (PAA) multilayer as the sensitive film, Chen et al demonstrated that the detection sensitivity of a fiber-optic SPR Hg 2+ ion sensor was up to 0.5586 nm/μM [ 25 ].…”