Abstract
In this investigation, etched-fibers are coated by 2D layers such as Molybdenum disulfide (MoS2), Molybdenum diselenide (MoSe2) and composition of graphene and graphene oxide (G/GO) to modify humidity sensing. The relative differentiation of attenuations (RDA) in presence of relative humidity (RH) is measured by Optical Loss Test Set at two standard-wavelengths-telecommunication (1310 nm and 1550 nm). Results show that the etched single-mode fiber (ESMF) coated with G/GO has relatively high and one by one function for RDA versus RH (more than 30%). Also, its sensitivity and variance are reasonable. The MoSe2 based sensor is applicable at humidity below 30% because of higher RDA. However, it is not useful at humidity more than 30% due to the absence of one by one function for RDA versus RH. Besides, ESMF coated with MoS2 has indistinctive behavior and is not useful as a humidity sensor.
Highlights
In this investigation, etched-fibers are coated by 2D layers such as Molybdenum disulfide (MoS2), Molybdenum diselenide (MoSe2) and composition of graphene and graphene oxide (G/GO) to modify humidity sensing
etched single-mode fiber (ESMF) that coated by G/GO, M oSe2, and M oS2 to application as humidity sensing are prepared
The relative differentiation of attenuations (RDA), repeatability, sensitivity, and variance analyzes are investigated versus relative humidity (RH) at both standards wavelengths of telecommunication (1310 nm and 1550 nm)
Summary
SMF is used as the main part of the optical-humidity sensor. To modify the sensing, the diameter of SMF reduced by corroding it in HF acid and layered with 2D materials (G/GO, MoSe2, and MoS2) to achieve desirable evanescence field. The quality of MoSe2 layers is investigated by TEM, SEM, EDX, Raman, FTIR and XRD analysis. The quality of MoS2 layers is investigated by TEM, SEM, EDX, Raman, FTIR, and XRD analysis (Fig. 3). In order to make more changes in the refractive index by water absorption, 2D materials have deposited on the surface of ESMF by dip coating in transparent solution contain one or few layers of G/GO, MoS2 and MoSe2. These solutions are prepared by adding 5 mg of synthesized powders to 10 cc Distilled water separately, sonicating for 2 h, and centrifuging. Due to the presence of temperature and humidity control system in cloud chamber, these quantities are uniform and constant throughout chamber
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