Humidity-enhanced NO$_2$ gas sensing using atomically sharp edges in multilayer MoS$_2$
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| Format: | Preprint |
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2024
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| _version_ | 1866913570403385344 |
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| author | Agrawal, Abhay V. Polyakov, Alexander Yu. Eriksson, Jens Antosiewicz, Tomasz J. Shegai, Timur O. |
| author_facet | Agrawal, Abhay V. Polyakov, Alexander Yu. Eriksson, Jens Antosiewicz, Tomasz J. Shegai, Timur O. |
| contents | Ambient humidity poses a significant challenge in the development of practical room temperature NO$_2$ gas sensors. Here, we employ atomically precise zigzag edges in multilayer MoS$_2$, fabricated using electron beam lithography and anisotropic wet etching, to achieve highly sensitive and selective gas sensing performance that is humidity-tolerant at elevated temperatures and humidity-enhanced at room temperature under ultraviolet illumination. Notably, exposure to 2.5 parts per billion (ppb) NO$_2$ at 70% relative humidity under ultraviolet illumination and at room-temperature resulted in a 33-fold increase in response and a 6-fold faster recovery compared to 0% relative humidity, leading to response values exceeding 1100%. The optimized samples demonstrated a theoretical detection limit ranging from 4 to 400 parts per trillion (ppt) NO$_2$. The enhanced NO$_2$ sensing capabilities of MoS$_2$ edges have been further confirmed through first-principles calculations. Our study expands the applications of nanostructured MoS$_2$ and highlights its potential for detecting NO$_2$ at sub-ppb levels in complex scenarios, such as high humidity conditions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_01043 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Humidity-enhanced NO$_2$ gas sensing using atomically sharp edges in multilayer MoS$_2$ Agrawal, Abhay V. Polyakov, Alexander Yu. Eriksson, Jens Antosiewicz, Tomasz J. Shegai, Timur O. Applied Physics Ambient humidity poses a significant challenge in the development of practical room temperature NO$_2$ gas sensors. Here, we employ atomically precise zigzag edges in multilayer MoS$_2$, fabricated using electron beam lithography and anisotropic wet etching, to achieve highly sensitive and selective gas sensing performance that is humidity-tolerant at elevated temperatures and humidity-enhanced at room temperature under ultraviolet illumination. Notably, exposure to 2.5 parts per billion (ppb) NO$_2$ at 70% relative humidity under ultraviolet illumination and at room-temperature resulted in a 33-fold increase in response and a 6-fold faster recovery compared to 0% relative humidity, leading to response values exceeding 1100%. The optimized samples demonstrated a theoretical detection limit ranging from 4 to 400 parts per trillion (ppt) NO$_2$. The enhanced NO$_2$ sensing capabilities of MoS$_2$ edges have been further confirmed through first-principles calculations. Our study expands the applications of nanostructured MoS$_2$ and highlights its potential for detecting NO$_2$ at sub-ppb levels in complex scenarios, such as high humidity conditions. |
| title | Humidity-enhanced NO$_2$ gas sensing using atomically sharp edges in multilayer MoS$_2$ |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2411.01043 |