Abstract In this paper, we have fabricated and characterized a bimetallic optical fiber surface plasmon resonance (SPR) sensor, followed by molybdenum disulfide (MoS2) nanosheets have been coated on the surface of metal film. The performance of the sensor is discussed in terms of the sensitivity and the figure of merit (FOM) theoretically and experimentally. The effect of different thickness of Au/Ag film on the performance of the sensor was studied. The results indicate that the FOM of sensor with silver film is much higher than that with gold film, although gold film is conducive to the sensitivity improvement. Two types of sensors are fabricated, which are the sensor with silver layer and the sensor with bimetallic layers of silver and gold. The sensitivity of the sensor with silver film and the sensor with bimetallic layers are 2141 nm/RIU and 2487 nm/RIU, respectively; and the FOM values are 19.44 RIU−1 and 18.47 RIU−1, respectively. Then, it is theoretically confirmed that MoS2 has the potential to promote the sensitivity of SPR sensor, and the sensitivity is tuned by the number of layers of MoS2 nanosheets. MoS2 nanosheets successfully bridged the gold film with the help of chemical bonds. The sensitivity of the sensor with MoS2 nanosheets is 3061 nm/RIU, and its FOM value is 23.29 RIU−1.

中文翻译：

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基于二硫化钼纳米片的双金属光纤 SPR 传感器灵敏度的提高

摘要 在本文中，我们制造并表征了一种双金属光纤表面等离子体共振（SPR）传感器，然后将二硫化钼（MoS2）纳米片涂覆在金属薄膜表面。从理论上和实验上根据灵敏度和品质因数 (FOM) 讨论了传感器的性能。研究了不同厚度的Au/Ag薄膜对传感器性能的影响。结果表明，虽然金膜有利于灵敏度的提高，但银膜传感器的FOM远高于金膜。制造了两种类型的传感器，即带有银层的传感器和带有银和金双金属层的传感器。银膜传感器和双金属层传感器的灵敏度分别为2141 nm/RIU和2487 nm/RIU；FOM 值分别为 19.44 RIU-1 和 18.47 RIU-1。然后，理论上证实了 MoS2 具有提高 SPR 传感器灵敏度的潜力，并且灵敏度通过 MoS2 纳米片的层数进行调节。MoS2 纳米片在化学键的帮助下成功地桥接了金膜。带有二硫化钼纳米片的传感器的灵敏度为 3061 nm/RIU，其 FOM 值为 23.29 RIU-1。MoS2 纳米片在化学键的帮助下成功地桥接了金膜。带有二硫化钼纳米片的传感器的灵敏度为 3061 nm/RIU，其 FOM 值为 23.29 RIU-1。MoS2 纳米片在化学键的帮助下成功地桥接了金膜。带有二硫化钼纳米片的传感器的灵敏度为 3061 nm/RIU，其 FOM 值为 23.29 RIU-1。