Layer-Dependent NO2-Sensing Performance in MoS2 for Room-Temperature Monitoring

Meng Qi,Ziyang Huang,He Zheng,Ligong Zhao,Renhui Jiang,Jiaheng Wang,Jie Hu,Guoxujia Chen,Shuangfeng Jia,Jianbo Wang

ACS APPLIED NANO MATERIALS（2023）

Wuhan Univ

Cited 3|Views32

Abstract

Few-layer MoS2 with exceptional physical and chemical properties has attracted notable attention for next-generation gas sensors. The layer-dependent sensing performance for detecting NO2 based on MoS2 is not fully understood. Here, we report the direct synthesis of high-crystallinity uniform few-layer MoS2 via chemical vapor deposition. The influence of layer thickness on the NO2-sensing performance is evaluated. We show that, as compared to the monolayer and trilayer counterparts, the bilayer MoS2 presents the best sensitivity at room temperature. Further density functional theory calculations reveal that the bilayer MoS2 with an AA stacking sequence is more favorable for the physisorption of NO2 molecules due to the more negative adsorption energy, facilitating charge transfer during the NO2 adsorption and thus increasing the electrical response of the gas sensors. This work provides a basic understanding of layer-dependent gas-sensing performance and serves as a reference for designing room-temperature gas sensors for low power consumption and reliable responsivity.

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Key words

few-layer MoS2,AA stacking,gassensors,layer-dependent sensing,room temperature

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【要点】：本研究探讨了基于二硫化钼（MoS2）的层依赖性二氧化氮（NO2）传感性能，发现双层MoS2在室温下具有最佳传感灵敏度，并通过密度泛函理论揭示了其作用机制。

【方法】：通过化学气相沉积方法直接合成了高结晶度、均匀的少层MoS2。

【实验】：研究了不同层数的MoS2对NO2的传感性能，使用的数据集为实验测量所得，结果表明双层MoS2在室温下对NO2的传感性能最优。