摘要
An enhanced MXene-based SPR sensor combining theory and experiment is proposed. • Theory indicates that the sensitivity can be enhanced by up to 80.5% through spin-coating MXene. • Experiments show that the sensor’s sensitivity can be enhanced by up to 23.1% after spin-coating MXene. • The effects of different MXene concentrations and spin-coating cycles on the sensor are investigated. • This study lays a solid foundation for the practical development of biochemical sensors. We conduct numerical and experimental investigations on a prism-coupled surface plasmon resonance (SPR) sensor enhanced by MXene (Ti 3 C 2 T x ). The sensor is constructed in accordance with the Kretschmann configuration. The constituent layers of the proposed sensor are numerically optimized with the goal of achieving high sensitivity, detection accuracy (DA), and figure of merit (FOM). The maximum sensitivity is expected up to 3261.2 nm/RIU when Au film integrated with 9 layers of Ti 3 C 2 T x Mxene, which represents an 80.5% enhancement compared to that in the sole Au-film SPR sensor. Subsequent experimental validation is carried out, where Ti 3 C 2 T x MXene is deposited onto the surface of the Au film through a spin-coating technique. The sensor’s refractive index sensitivity, full width at half maximum (FWHM), and FOM are obtained via experimental measurements. The effects of spin-coating Ti 3 C 2 T x MXene with different concentrations and different layer numbers on the SPR sensor are investigated and discussed. The results show that the sensor achieves a sensitivity up to 2388.1 nm/RIU, indicating a maximum sensitivity enhancement of 23.1% compared to the Au-film SPR sensor. Both numerical simulations and experimental results verify that incorporating MXene into SPR sensors offers a viable strategy to improve the detection capability of SPR-based refractive index sensors. Download: Download high-res image (154KB) Download: Download full-size image
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