Improvement in the Gas Detection Capacity of ZnO-based Sensor: Impact of Static Potential
| Authors | D.K. Chaudhary1,2, R. Shrestha1, Y.R. Panthi3,4, M. Slouf3, L.P. Joshi1, S.P. Shrestha5 |
| Affiliations |
1Department of Physics, Amrit Campus, Tribhuvan University, 44600 Kathmandu, Nepal 2Central Department of Physics, Tribhuvan University, 44618 Kathmandu, Nepal 3Institute of Macromolecular Chemistry, Czech Academy of Sciences, 162 06 Prague 6, Czech Republic 4Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic 5Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur, Nepal |
| Е-mail | dinesh.chaudhary@ac.tu.edu.np |
| Issue | Volume 17, Year 2025, Number 4 |
| Dates | Received 23 May 2025; revised manuscript received 20 August 2025; published online 29 August 2025 |
| Citation | D.K. Chaudhary, R. Shrestha, et al., J. Nano- Electron. Phys. 17 No 4, 04009 (2025) |
| DOI | https://doi.org/10.21272/jnep.17(4).04009 |
| PACS Number(s) | 77.55.hf, 81.15.Rs, 68.55. – a, 07.07 – Df |
| Keywords | ZnO film, Spray pyrolysis (9) , Gas sensing, Response (10) , Static potential. |
| Annotation |
The gas detection using metal oxide semiconductor (MOS) nanomaterials is rising. Among numerous MOS, ZnO is a feasible candidate for gas detection. ZnO-based gas sensor working at high operating temperatures is mostly reported. As the high-temperature operation reduces the long-term stability of the sensor, more research work has to be done to develop a room-temperature gas sensor. Because of low thermal energy at room temperature, the availability of electrons on the ZnO surface and the adsorption of oxygen molecules is low, which results in the low gas response. In this prospectus, this work reports a novel method of enhancing the gas sensing efficacy of MOS-based gas sensors at ambient temperature. In this work, the ZnO film was synthesized adopting the spray pyrolysis route and was characterized by X-ray diffraction (XRD), UV-Visible spectroscopy, and scanning electron microscopy (SEM). The static potential of 0-24 V was applied to the spray-coated nanostructured ZnO film to increase its oxygen adsorption capacity on its surface, and then its ammonia sensing ability was measured at ambient temperature. The gas sensing measurements showed the enhancement of gas response from 30.290 ± 0.042 at 0 V to 54.581 ± 0.062 at 24 V. It also showed quick response with a response/recovery time of 4/338 at 24 V. Thus, this report claims that the application of DC potential could be one of the useful alternative methods of achieving a MOS-based gas sensor working with a significant response. |
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List of References |
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