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.
Highlights
The problem of heavy metal pollution is becoming more and more serious and has always been one of the key issues of environmental pollution [1,2]
In order to solve the above problems, this paper proposes a reflective fiber surface plasmon resonance (SPR) sensor for measuring
Sensitiverefractive film, we can conclude the proposed sensorwith can the be used for the sensing sensor in high-sensitive index sensing.that combined sensitive properties of the in subsequent experiments, we will investigate and analyze the sensitive film, we can conclude that the proposed sensor can be used for the sensing performances of the proposed sensor the measurement of Hgweconcentrations
Summary
The problem of heavy metal pollution is becoming more and more serious and has always been one of the key issues of environmental pollution [1,2]. In order to solve the above problems, this paper proposes a reflective fiber SPR sensor for measuring. A gold film for exciting SPR and a gold mirror for reflecting optical and a multimode fiber (MMF). A gold film for exciting SPR and a gold mirror for reflecting optical resonance are simultaneously coated on the surface of the SMF by using a sputtering apparatus. This resonance are simultaneously coated on the surface of the SMF by using a sputtering apparatus This reflective sensing structure can be used as a plug-in probe and is suitable for remote measurement. The fiber optic sensor designed in this paper has relatively good peak wavelength of the SPR. Good recyclability and stability while being simple to manufacture and operate
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