MXene V₂C-coated runway-type microfiber knot resonator for an all-optical temperature sensor

We present an all-optical temperature sensor device made of an MXene V₂C integrated runway-type microfiber knot resonator (MKR) for the first time. MXene V₂C is coated on the surface of the microfiber by optical deposition. The experimental results show that the normalized temperature sensing efficiency is ∼1.65 dB °C^-1 mm^-1. The high sensing efficiency of the temperature sensor we proposed benefits from the efficient coupling of the highly photothermal material MXene and the runway-type resonator structure, which provides a better idea for the preparation of all-fiber sensor devices.