Detection of copper by localized surface Plasmon resonance based fiber optic technique

The present article discusses a cost effective technique for the detection and quantification of copper ion by using localized surface Plasmon resonance (LSPR) based fiber optic technique. For the purpose, a small portion of a plastic optical fiber is functionalized with gold nanoparticles which are modified with 4-mercapto benzoic acid (4-MBA). The proposed is very successful in the detection of Cu2+ even in trace levels (ppb) in a wide range of real time samples. The results are comparable with the existing detection techniques.