材料科学
拉曼光谱
纳米颗粒
透射电子显微镜
扫描电子显微镜
相对湿度
化学工程
化学气相沉积
氢
纳米技术
爆炸物
光谱学
分析化学(期刊)
复合材料
光学
化学
物理
工程类
有机化学
色谱法
量子力学
热力学
作者
Shuja Bashir Malik,Fatima Ezahra Annanouch,Eduard Llobet
出处
期刊:Chemosensors
[Multidisciplinary Digital Publishing Institute]
日期:2023-10-26
卷期号:11 (11): 550-550
被引量:3
标识
DOI:10.3390/chemosensors11110550
摘要
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).
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