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- Title
Pd-Nanoparticle-Decorated Multilayered MoS 2 Sheets for Highly Sensitive Hydrogen Sensing.
- Authors
Malik, Shuja Bashir; Annanouch, Fatima Ezahra; Llobet, Eduard
- Abstract
In this work, efficient hydrogen gas sensors based on multilayered p-type bare MoS2 and Pd-decorated MoS2 were fabricated. MoS2 was deposited onto alumina transducers using an airbrushing technique to be used as a sensing material. Aerosol-assisted chemical vapor deposition (AACVD) was used to decorate layered MoS2 with Pd nanoparticles at 250 °C. The bare and Pd-decorated MoS2 was characterized using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), and Raman spectroscopy. The characterization results reveal the multilayered crystalline structure of MoS2 with successful Pd decoration. The size of the Pd nanoparticles ranges from 15 nm to 23 nm. Gas sensing studies reveal that a maximum response of 55% is achieved for Pd-decorated MoS2 operated at 150 °C to 100 ppm of H2, which is clearly below the explosive limit (4%) in air. The higher sensitivity due to Pd nanoparticle decoration was owed to a spillover effect. This study reveals that the sensitivity of the sensors is highly dependent on the amount of Pd decoration. Moreover, sensor responses increase slightly when exposed to 50% relative humidity (RH at 25 °C).
- Subjects
FIELD emission electron microscopy; HYDROGEN detectors; CHEMICAL vapor deposition; GAS detectors; FLAMMABLE limits
- Publication
Chemosensors, 2023, Vol 11, Issue 11, p550
- ISSN
2227-9040
- Publication type
Article
- DOI
10.3390/chemosensors11110550