Highly sensitive hydrogen gas sensor based on a MoS2-Pt nanoparticle composite

• Published in: Applied surface science 2020-03, Vol.506, p.144981, Article 144981
• Main Authors: Gottam, Sandeep Reddy, Tsai, Chi-Ting, Wang, Li-Wen, Wang, Chen-Tao, Lin, Chun-Cheng, Chu, Sheng-Yuan
• Format: Article
• Language: English
• Subjects: Hydrogen gas sensor; Metal sulfide; Recovery time; Response time; Sensor response
• ISSN: 0169-4332
• DOI: 10.1016/j.apsusc.2019.144981

[Display omitted] •Introduction of MoS2-Pt nanocomposite material for gas sensing.•Achieve ultra fast response time of 4 s and recovery time of 19 s for 100 ppm of H2.•Obtain high sensor response of ~10 for 100 ppm of H2 in hydrogen gas sensing.•Drastic increase in sensor response with high stability and good selectivity. A highly sensitive hydrogen gas sensor composed of an MoS2-Pt nanoparticle thin film as the active layer is introduced. The sensor achieved ultra-fast response and recovery rates of 4 s and 19 s, respectively, for 100 ppm of H2. The MoS2-Pt composite film exhibits a high sensor response (R1/R2) of 10 when exposed to 100 ppm of H2 gas, which outperforms the existing metal sulfide- based sensors. The stability of the device over a period of 70 days and the selectivity of the device is outstanding. A plausible mechanism for the MoS2-Pt based H2 gas sensor is discussed. Furthermore, the sensitivity, response and recovery rates for various concentrations of H2 gas are studied. The sensor response is exceptionally promising. This sensor with metal sulfide-platinum composite active layers can be applied in the sensor field to amplify the sensing performance.