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<p>Gas sensors play a critical role in monitoring hazardous industrial emissions and improving indoor air quality. Among two-dimensional (2D) transition metal dichalcogenides (TMDs), molybdenum disulfide (MoS<sub>2</sub>) has emerged as a promising sensing material due to its high surface area, tunable bandgap, and strong surface reactivity. This work systematically investigates the influence of operating temperature and nitrogen dioxide (NO<sub>2</sub>) concentration on the performance of nanostructured MoS<sub>2</sub> thin-film sensors fabricated via chemical vapor deposition (CVD). Highly crystalline, continuous MoS<sub>2</sub> films (20&#xa0;nm thick) were deposited on alumina substrates with optimized interdigitated electrode geometry to enhance gas–surface interaction. Structural and morphological characterization using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and Raman spectroscopy confirmed the phase purity, uniform nanosheet morphology, and low surface roughness. Electrical transport measurements revealed that sensor resistance increased upon NO<sub>2</sub> exposure, consistent with n-type semiconducting behavior. The sensor exhibited high selectivity toward NO<sub>2</sub> over other common gases, with the optimal response (~ 14.2%) observed at 20&#xa0;ppm and 150&#xa0;°C, along with fast response (102&#xa0;s) and recovery (94&#xa0;s) times. Elevated temperature not only significantly improved response but also induced irreversible structural defects at higher concentrations. These findings demonstrate that precisely engineered MoS<sub>2</sub> films offer a pathway toward compact, selective, and thermally tunable NO<sub>2</sub> sensors for environmental and industrial monitoring applications.</p>

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Influence of temperature and NO2 concentration on the sensing performance of nanostructured MoS2

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Ramesh Kumar,
  • Jitendra Singh,
  • Pawan K. Kulriya,
  • Mahesh Kumar,
  • Vinod Singh

摘要

Gas sensors play a critical role in monitoring hazardous industrial emissions and improving indoor air quality. Among two-dimensional (2D) transition metal dichalcogenides (TMDs), molybdenum disulfide (MoS2) has emerged as a promising sensing material due to its high surface area, tunable bandgap, and strong surface reactivity. This work systematically investigates the influence of operating temperature and nitrogen dioxide (NO2) concentration on the performance of nanostructured MoS2 thin-film sensors fabricated via chemical vapor deposition (CVD). Highly crystalline, continuous MoS2 films (20 nm thick) were deposited on alumina substrates with optimized interdigitated electrode geometry to enhance gas–surface interaction. Structural and morphological characterization using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and Raman spectroscopy confirmed the phase purity, uniform nanosheet morphology, and low surface roughness. Electrical transport measurements revealed that sensor resistance increased upon NO2 exposure, consistent with n-type semiconducting behavior. The sensor exhibited high selectivity toward NO2 over other common gases, with the optimal response (~ 14.2%) observed at 20 ppm and 150 °C, along with fast response (102 s) and recovery (94 s) times. Elevated temperature not only significantly improved response but also induced irreversible structural defects at higher concentrations. These findings demonstrate that precisely engineered MoS2 films offer a pathway toward compact, selective, and thermally tunable NO2 sensors for environmental and industrial monitoring applications.