Cu<sup>2+</sup>-imprinted optical fiber SPR sensor for intelligent recognition
Lijie Zhang, Wenlong Yang, Chi Zhang, Rui Pan, Qiaoling Chen, Liuyang Zhang
Abstract
An optical fiber surface plasma resonance (SPR) sensor with MMF-TCF-MMF structure was designed to realize intelligent recognition of copper ions (Cu 2+ ), and the selective adsorption sensitization was achieved by plating a layer of Cu 2+ -imprinted film on the surface of gold film excitation layer. Combining the principle of optical fiber interference and SPR, the proposed sensor realized the detection of the copper ions concentration through measuring the refractive index changes caused by ions adsorption on imprinted film. The Cu 2+ -imprinted optical fiber SPR sensor can realize the intelligent recognition and detection of copper ions in the complex environment and exhibits a detection sensitivity of -10.05 pm/ppm. The proposed sensor has tremendous development potential in practical application, and provides new ideas for the field of metal ions detection.