Optical Fiber Surface Plasmon Resonance Alcohol Sensor Based on MXene/SnO2/Au Structure

This study presents a novel surface plasmon resonance (SPR) alcohol(ethanol) sensor utilizing an MXene/SnO2/Au composite structure tailored for MSM optical fibers. A gold film is applied to the surface of the single-mode optical fiber cladding via magnetron sputtering. Subsequent layers SnO(2 )of nanofiber and MXene are constructed on this gold film using electrospinning technology, creating a multi-layered composite structure that offers a synergistic enhancement effect. Experimental findings indicate that the sensor's sensitivity to alcohol concentration stands at 3648.47 nm/RIU. Furthermore, there is a pronounced linear correlation between the SPR resonant wavelength and the alcohol concentration, with an R-2 value of 0.9953. A series of five repeated tests reveals a standard deviation below 1.83%, underscoring the sensor's remarkable stability and repeatability. This research offers a groundbreaking approach to the design of highly sensitive optical fiber SPR sensors, holding significant implications for applications in biomolecular detection, chemical sensing, and environmental monitoring.