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Related Experiment Video

Updated: Oct 13, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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Published on: November 28, 2017

Effects of Tungsten Disulphide Coating on Tapered Microfiber for Relative Humidity Sensing Applications.

Norazida Ali¹, Saaidal Razalli Azzuhri², Md Ashadi Md Johari³

¹Department of Electrical, Electronic and System Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Malaysia.

Sensors (Basel, Switzerland)

|November 13, 2021

Summary

Tungsten disulfide (WS₂) enhances microfiber (MF) optical fiber sensors for humidity detection. WS₂ coating on a 2 µm MF achieved high sensitivity and linearity, improving evanescent field interactions for better sensing.

Keywords:

humidity sensor tapered microfiber transition-metal dichalcogenide tungsten disulphide (WS2)

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Last Updated: Oct 13, 2025

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Published on: April 26, 2017

Area of Science:

Materials Science
Nanotechnology
Optical Sensing

Background:

Two-dimensional materials like tungsten disulfide (WS₂) offer unique properties for advanced sensing.
Optical fiber sensors provide sensitive detection methods for environmental parameters.
Microfiber (MF) tapers enhance evanescent field interactions for improved sensing.

Purpose of the Study:

To investigate the impact of WS₂ coating on tapered microfiber for relative humidity (RH) sensing.
To evaluate the sensitivity, linearity, and stability of WS₂-coated MFs for RH detection.
To compare the performance of coated and non-coated MFs across various humidity levels.

Main Methods:

Fabrication of microfiber tapers (2, 5, 10 µm waist diameters) using flame brushing.
Deposition of WS₂ onto microfiber tapers via the drop-casting technique.
Testing sensor response to varying RH levels (45-90%) at room temperature and analyzing transmitted power.

Main Results:

WS₂ coating significantly enhanced the sensitivity of microfiber-based humidity sensors.
The 2 µm WS₂-coated MF exhibited a high sensitivity of 0.0861 dB/% RH with over 99% linearity.
Experiments demonstrated good repeatability and sensing stability for the WS₂-coated MFs.

Conclusions:

WS₂ coating effectively enhances the evanescent field effect in optical fiber humidity sensors.
Tapered microfiber coated with WS₂ is a promising platform for high-performance humidity sensing applications.
The developed sensor shows potential for accurate and stable environmental monitoring.