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<p>This research is intended to examine the Graphene oxide/Molybdenum disulfide (GO/MoS<sub>2</sub>) coated U-bend fiber optic evanescent-based sensor by comparing its sensitivity, sensor response, and linearity with the standalone GO and MoS<sub>2</sub> sensor probes. The cladding-etched dip-coated U-bend multimode fiber was experimented with to measure the humidity response at a wide range of relative humidity, from 11 RH to 85% RH. The structural, morphological, and chemical features of the produced GO/MoS<sub>2</sub> composite&#xa0;were assessed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and field emission scanning electron microscope (FESEM). Our Findings show that a hydrothermally synthesized sensor probe composed of GO/MoS<sub>2</sub> (1:1) can achieve a high sensitivity of 7.65 counts /%RH, exhibit a maximum sensor response of up to 21.6%, and demonstrate a good linearity of 0.99 through a linear fitting model with limit of detection (LOD) and limit of quantification (LOQ) of 3.25% RH and 9.84% RH. Additionally, the stability investigation reveals that our sensor probe is stable, particularly at 35%, 55%, and 85% relative humidity. Our studies suggest that the proposed sensor is effective in measuring relative humidity in applications such as environmental monitoring, nuclear reactor coolant system leakage detection, breath monitoring, and farming activities.</p>

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Comparative analysis of U-bend fiber optic evanescent wave sensors coated with GO/MoS2 composite for humidity detection

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • S. Sri Ram Ganesh,
  • Zachariah C. Alex,
  • G. Aarthi

摘要

This research is intended to examine the Graphene oxide/Molybdenum disulfide (GO/MoS2) coated U-bend fiber optic evanescent-based sensor by comparing its sensitivity, sensor response, and linearity with the standalone GO and MoS2 sensor probes. The cladding-etched dip-coated U-bend multimode fiber was experimented with to measure the humidity response at a wide range of relative humidity, from 11 RH to 85% RH. The structural, morphological, and chemical features of the produced GO/MoS2 composite were assessed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and field emission scanning electron microscope (FESEM). Our Findings show that a hydrothermally synthesized sensor probe composed of GO/MoS2 (1:1) can achieve a high sensitivity of 7.65 counts /%RH, exhibit a maximum sensor response of up to 21.6%, and demonstrate a good linearity of 0.99 through a linear fitting model with limit of detection (LOD) and limit of quantification (LOQ) of 3.25% RH and 9.84% RH. Additionally, the stability investigation reveals that our sensor probe is stable, particularly at 35%, 55%, and 85% relative humidity. Our studies suggest that the proposed sensor is effective in measuring relative humidity in applications such as environmental monitoring, nuclear reactor coolant system leakage detection, breath monitoring, and farming activities.