Evaluating the Gas Sensing Behavior of Monolayer MoS₂ through Quantitative Analysis

Tzu-En Huang^1*, Hua-Hsing Liu¹, Chen-Yu Wang¹, Bor-Wei Liang², Ruei-Yu Hsu², Chiu-Hsien Wu⁴, Kuan-Ming Hung³, Yann-Wen Lan², Kuang Yao Lo¹

¹Department of Physics, National Cheng Kung University, 701 Tainan, Taiwan
²Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
³Department of Electronic Engineering,, National Kaohsiung University of Science and Technology, 807 Kaohsiung, Taiwan
⁴Department of Physics,, National Chung Hsing University, Taichung, 402, Taiwan

* Presenter:Tzu-En Huang, email:l28111558@gs.ncku.edu.tw

Gas sensing research with transition metal dichalcogenides (TMDs) faces a persistent challenge: irrecoverable responses. Attempts to enhance recoverability, such as heating or complex heterostructures, risk surface damage or increased sensor size. In gas sensing, repeatability is crucial.Our innovative study exploits TMDs' surface molecule trapping properties to investigate gas adsorption for reliable sensors. We fine-tune the material's surface, introducing high concentrations of the target adsorbent to occupy inactive sites. To validate our approach, we've developed a comprehensive two-trap model for physical and chemical adsorption. Systematic variations in target adsorbent concentrations establish a linear relationship and consistent results. This robust correlation demonstrates our method's repeatability of gas sensing signals.Our study establishes a link between sensor response and target adsorbent presence, addressing irrecoverable responses. This research emphasizes the role of repeatability in advancing gas sensing. In conclusion, our method offers a promising solution, opening new horizons in gas sensing research.

Keywords: Gas sensors, Recoverable signals, Transition metal dichalcogenides, 2D material, Molybdenum disulfide