Chitosan/Polyacrylic Acid Functionalized Side-Polish Polymer Optical Fiber-Based SPR Sensor for Cu<sup>2+</sup> Ion Detection
A polymer optical fiber SPR sensor for detecting Cu<sup>2+</sup> ion concentration in water is proposed. The sensor employs a simple side-polish structure and realizes the detection of Cu<sup>2+</sup> ion concentration by employing the chitosan (CS)/polyacrylic acid (PAA) bil...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/12/5/461 |
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| Summary: | A polymer optical fiber SPR sensor for detecting Cu<sup>2+</sup> ion concentration in water is proposed. The sensor employs a simple side-polish structure and realizes the detection of Cu<sup>2+</sup> 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 Cu<sup>2+</sup> ion detection are analyzed experimentally. The experimental results demonstrate that the sensor exhibits a high sensitivity of 465.539 nm/ppm for the Cu<sup>2+</sup> ion detection in the concentration range of 0–0.04 ppm. And it has a fast response speed and good selectivity for Cu<sup>2+</sup> ions. The sensor has the advantages of simple structure and low cost, and has potential applications in the field of heavy metal detection. |
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| ISSN: | 2304-6732 |