An MFC-IIP functionalized SNMNS optical fiber sensor for Cd2+ detection

This study presents a novel optical fiber sensor based on a MoS 2 @Fe 3 O 4 @CTS ion-imprinted polymer (MFC-IIP) functionalized single-mode fiber-no-core fiber-multi-mode fiber-no-core fiber-single-mode fiber (SNMNS) structure for the quantitative detection of trace cadmium ions (Cd 2+ ) in solution. The MFC-IIP nanomaterial was coated onto the surface of the SNMNS fiber structure as a selective sensing membrane to enable highly sensitive and specific detection of Cd 2+ . The experimental results demonstrate that the sensor achieves a maximum detection sensitivity of 119.06 nm/μM for cadmium ions, with a limit of detection (LOD) as low as 0.77 nM. This study introduces a novel detection approach applicable to real-time online water quality monitoring, early diagnosis of chronic cadmium poisoning, and the rapid analysis of heavy metal cadmium in complex traditional Chinese medicine matrices.