Enhancement of SPR effect and sensing characteristics in photonic crystal fiber with Ti₃C₂T_x-Mxene/silver film

Sensitivity is an important index parameter for evaluating the performance of a sensor. To improve the sensitivity of the sensor, we propose and demonstrate a surface plasmon resonance (SPR) fiber sensor based on Ti ₃ C ₂ T _x -Mxene/silver film. A V-shaped photonic crystal fiber (V-PCF) is used as the sensing probe, and a silver film is deposited on its surface by magnetron sputtering to excite the SPR effect. Multimode fibers are used to transmit signals at both ends of the sensor probe. Simulation results show that light can be stably transmitted in the cladding of the V-PCF. Experimental results show that the refractive index (RI) measurement range of the sensor is between 1.333 and 1.420, and the maximum RI sensitivity is 20188 nm/RIU; In order to extend the detection function of the sensor, we coated PDMS film on the Ti ₃ C ₂ T _x -MXene/silver film. When the sensor is used to measure temperature, the maximum temperature sensitivity is 9.33 nm/℃ in the range of 0 ℃-100 ℃. Therefore, the proposed composite film structure sensor in this paper has the advantages of ultra-high detection sensitivity and oxidation resistance, which can have a great competitive advantage in the sensing field.