Related Experiment Video
Updated: Apr 25, 2026
07:58
A Polyaniline-based Sensor of Nucleic Acids
Published on: November 1, 2016
7.3K
Copper ion concentration sensing using a CS/PAA-coated SNMNMS fiber interferometer: analysis via adsorption kinetics
Applied Optics
|April 24, 2026
Summary
A novel fiber optic sensor using chitosan/polyacrylic acid (CS/PAA) effectively detects copper ions. This sensor offers high sensitivity and selectivity for environmental monitoring and water quality assessment.
Area of Science:
- Materials Science
- Analytical Chemistry
- Optical Engineering
Background:
- Fiber optic sensors offer sensitive detection methods.
- Chitosan and polyacrylic acid (CS/PAA) composites show promise for ion binding.
- Accurate copper ion monitoring is crucial for environmental and health safety.
Purpose of the Study:
- To develop and demonstrate a fiber optic sensor for copper ion concentration detection.
- To investigate the adsorption kinetics and establish a quantitative correlation between optical signal and copper ion concentration.
- To evaluate the sensor's sensitivity, selectivity, response time, and regeneration capabilities.
Main Methods:
- Fabrication of a single-mode fiber (SMF)-no-core fiber (NCF)-multimode fiber (MMF)-NCF-MMF-SMF (SNMNMS) interferometer.
- Functionalization of the fiber core with a CS/PAA coating for copper ion adsorption.
- Monitoring the wavelength shift of the interference dip as an optical indicator.
- Kinetic analysis using a pseudo-first-order (PFO) model and establishing a calibration curve.
- Testing sensor regeneration using ethylenediaminetetraacetic acid (EDTA).
Main Results:
- The sensor demonstrated a sensitivity of 0.00132 nm/(mg/L) and linearity of 0.998 for copper ion concentrations from 100 to 1000 mg/L.
- Adsorption kinetics followed a PFO model, enabling accurate extraction of rate constants.
- The sensor showed excellent selectivity for copper ions over other heavy metal ions.
- A response time of 16 minutes and stable performance after regeneration with EDTA were achieved.
Conclusions:
- The CS/PAA-functionalized SNMNMS interferometer is a viable platform for sensitive and selective copper ion detection.
- The sensor exhibits rapid response, good regeneration, and stable performance, suitable for real-world applications.
- This optical sensing approach provides a reliable method for water quality monitoring and environmental analysis.
