The mechanism study of highly sensitive gas sensing based on double-layer graphene plasmons

Jiao Chi; LinChun Wang; XinYang Zhao

doi:10.1117/12.2682127

24 May 2023 The mechanism study of highly sensitive gas sensing based on double-layer graphene plasmons

Jiao Chi, LinChun Wang, XinYang Zhao

Proceedings Volume 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023); 127060I (2023) https://doi.org/10.1117/12.2682127
Event: First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 2023, Shanghai, China

Abstract

The gas sensing based on graphene plasmons enhanced infrared absorption has the advantages of label-free identification of gas molecules, low loss and tunability. However, the optical field confinement of graphene plasmons is much smaller than distribution range of gas molecules, resulting in weak interaction between graphene plasmons and gas molecules. It is difficult to significantly improve the sensitivity of gas sensing. A gas sensor based on double-layer graphene nanoribbons with enhanced plasmons is proposed to improve the near-field coupling between highly confined field and gas molecules. Meanwhile, the influence mechanism of trapping free-gas molecules via surface adsorption is explored on increasing the sensitivity of gas sensing. The results show that the vibrational absorption enhancement of gas molecules based on double-layer graphene nanoribbons is improved by at least an order of magnitude than the single-layer graphene. The surface adsorption by graphene which tunes the gas concentration close to graphene can change the mode weight of vibrational mode to improve the sensitivity further. This study provides an important theoretical basis for designing and preparing gas sensor based on two-dimensional materials plasmons enhanced infrared absorption, and promotes the development of highly sensitive and integrated gas

Citation Download Citation

Jiao Chi, LinChun Wang, and XinYang Zhao "The mechanism study of highly sensitive gas sensing based on double-layer graphene plasmons", Proc. SPIE 12706, First International Conference on Spatial Atmospheric Marine Environmental Optics (SAME 2023), 127060I (24 May 2023); https://doi.org/10.1117/12.2682127

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KEYWORDS

Graphene

Plasmons

Gas sensors

Adsorption

Vibration

Light absorption

Absorption spectrum

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