Synthesis and characterization of 2D MXene: Device fabrication for humidity sensing

• Published in: Journal of science. Advanced materials and devices Vol. 7; no. 1; p. 100390
• Main Authors: Haq, Yasir-Ul, Ullah, Rizwan, Mazhar, Sadaf, Khattak, Rozina, Qarni, Awais Ali, Haq, Zeeshan-Ul, Amin, Shahid
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2022; Elsevier
• ISSN: 2468-2179; 2468-2179
• DOI: 10.1016/j.jsamd.2021.08.003

High-performance MXene based capacitive humidity sensor is fabricated by a drop casting method. The material is characterized by Fourier Transform Infrared Spectrometry (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD). The fabricated capacitive humidity sensor was tested at various frequencies (100 Hz−1 MHz) in a broad relative humidity (RH) detection range (13–97%). The capacitive sensitivity of MXene increased to 3400% at 90% RH and lower frequency (100 Hz) whereas, at the same % RH and high frequencies such as 100 kHz, 250 kHz, and 1 MHz, the sensitivity decreased to 13.5%, 8%, and 3.9% respectively. A rapid capacitive response/recovery time (1.11/0.65 s) recorded at lower frequency which is comparatively shorter than that at higher frequency (3.8/1.02 s). The 2-dimensional (2D) structure of MXene enables the sensor to detect minute RH variation of 1%. These features allow the MXene based sensor to monitor human respiration and physical condition by displaying specific patterns.