| Summary: | Affordable and efficient fiber sensor development is crucial for addressing critical environmental parameter monitoring. This paper focuses on the fabrication of a fiber optic sensor coated with two-dimensional (2D) Molybdenum Disulfide (MoS I2 for humidity sensing applications. A single-mode fiber optic is tapered using a heat-and-pull method, resulting in a waist diameter of 7 μ m and a length of 5 mm. Tapered fiber sensors offer advantages for measuring physical parameters as the waist diameter is reduced. In this experiment, the diameter of the single-mode fiber (SMF) is tapered to 7 μ m. The tapered fiber is then coated with a Molybdenum Disulfide (MoS2) solution and tested within a relative humidity range of 40% to 60% at a temperature of 25 ° C. The tapered fiber is connected to a Tunable Laser Source (TLS) as input, and the resulting waveforms are analyzed using an Optical Spectrum Analyzer (OSA). Shifts in wavelength are monitored for untapered fibers, tapered fibers without coating, and tapered fibers with coating. The sensor achieved a linearity of 0.012 nm / % RH and a sensitivity of 0.015 nm / % RH. © 2024 IEEE.
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