Work

Chitosan/Polyacrylic Acid Functionalized Side-Polish Polymer Optical Fiber-Based SPR Sensor for Cu2+ Ion Detection

Year: 2025

Type: article

Abstract: A polymer optical fiber SPR sensor for detecting Cu2+ ion concentration in water is proposed. The sensor employs a simple side-polish structure and realizes the detection of Cu2+ ion concentration by employing the chitosan (CS)/polyacrylic acid (PAA) bilayer film on the gold film of the optical fiber surface. The structure of the fiber probe is optimized, and the sensing performances for the Cu2+ ion detection are analyzed experimentally. The experimental results demonstrate that the sensor exhibits a high sensitivity of 465.539 nm/ppm for the Cu2+ ion detection in the concentration range of 0–0.04 ppm. And it has a fast response speed and good selectivity for Cu2+ ions. The sensor has the advantages of simple structure and low cost, and has potential applications in the field of heavy metal detection.

Source: Photonics

DOI: 10.3390/photonics12050461