| Inkjet printing MoS2 nanosheets for hydrogen sensing applications |
| Seung-Ik Han1,3, Rubaya Yeasmin1, Le Thai Duy2,4,5, Yong-Gyu Noh2, Sang Yeon Lee6,7, Chiwan Park1, Gwanggyo Jung1, Kye-Si Kwon8, Hyungtak Seo1,2 |
1Department of Energy Systems Research, Ajou University, Suwon, 16499, Republic of Korea
2Department of Materials Science and Engineering, Ajou University, Suwon, 16499, Republic of Korea
3Engineering Research Institute, Ajou University, Suwon, 16499, Republic of Korea
4Faculty of Materials Science and Technology, University of Science, Ho Chi Minh City, 70000, Vietnam
5Vietnam National University (VNU), Ho Chi Minh City, 70000, Vietnam
6Sensors and Actuators Team (SAT), IMEC, 3001, Leuven, Belgium
7Department of Electrical Engineering (ESAT), KU Leuven, 3001, Leuven, Belgium
8Department of Mechanical Engineering, Soonchunhyang University, Asan, 32358, Republic of Korea |
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Received: November 10, 2023; Revised: February 3, 2024 Accepted: February 11, 2024. Published online: March 22, 2024. |
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| ABSTRACT |
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2D nanomaterials are of great interest in many modern applications. In particular, MoS2 nanomaterial with a narrow band gap of 1.8 eV is expected as one of the best candidates for low-cost gas sensors. To reduce the costs of scalable sensor production, inkjet printing technology has attracted much attention during the current transition period of the fourth industry. Here we report an economical hydrogen-sensor using inkjet-printed MoS2 nanosheets with Pd nanocatalyst (MoS2–Pd). Few-layer MoS2 nanosheets were synthesized via a mechanical exfoliation method, and Pd nanodots (as an Irish type) were formed using short e-beam evaporation. Our fabricated sensors based on MoS2–Pd have a small channel area of 5 × 300 µm, enabling superfast response and recovery of the sensors (~ 6.6 s) toward a wide range of hydrogen concentrations at 50 °C. With the high sensing performance and endurability, our inkjet-printed sensor devices are promising for practical hydrogen sensing and storing applications, and our study shows a valuable route to develop gas-sensitive inks for other analytes. |
| Key words:
Inkjet printing · E-beam evaporation · MoS2 nanosheets · Pd nanodots · Hydrogen sensor |
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