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Nano Research 2020, 13(6): 1704-1712 https://doi.org/10.1007/s12274-020-2796-7
Research Article | Issue | Published: 28 April 2020

Fabrication of oxygen-doped MoSe2 hierarchical nanosheets for highly sensitive and selective detection of trace trimethylamine at room temperature in air

Show Author's Information Nannan Hou1,  Qianqian Sun1,  Jing Yang1,  Su You1,  Yun Cheng1,  Qian Xu2,  Wei Li1,  Shiqi Xing1,  Li Zhang1,  Junfa Zhu2,  Qing Yang1( )
Hefei National Laboratory of Physical Sciences at the Microscale (HFNL), Department of Chemistry, Laboratory of Nanomaterials for Energy Conversion (LNEC), University of Science and Technology of China, Hefei 230026, China
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Keywords:
oxygen-doped MoSe2 nanosheet, ambient gas sensing, trimethylamine detection, highly selective, trace detection limit
Topics:
Chemical sensors Electronic structureMorphologyNanosheetsOxygenSelenium compoundsSemiconductor dopingTransition metals
Cite this article:
Hou N, Sun Q, Yang J, et al. Fabrication of oxygen-doped MoSe2 hierarchical nanosheets for highly sensitive and selective detection of trace trimethylamine at room temperature in air. Nano Research, 2020, 13(6): 1704-1712. https://doi.org/10.1007/s12274-020-2796-7
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Abstract Full text Electronic supplementary material About this article

Intelligent gas sensors based on the layered transition metal dichalcogenides (TMDs) have attracted great interest in the field of gas sensing due to their multiple active sites, fast electron, mass transfer capability and large surface-to-volume ratio. However, conventional TMDs-based sensors typically work at elevated temperature in inert atmosphere, which would largely limit the corresponding practical applications. Herein, novel oxygen-doped MoSe2 hierarchical nanostructures composed of ultrathin nanosheets with large specific surface area have been designed and generated typically at 200 °C in air for fast and facile gas sensing of trimethylamine (TMA), effectively. Benefited from the gas-accessible hierarchical morphology and high surface area with abundant nanochannels, highly sensitive and selective detection of trace TMA has been achieved under ambient condition, and as detected the theoretical limit of detection (LOD) is 8 ppb, which is the lowest for TMA detection under ambient condition among the reported studies. The mechanism of oxygen doping on the improved gas-sensing performance has been investigated, revealing that the oxygen doping could greatly optimize the electronic structure, thus regulate the Fermi level of MoSe2 as well as the affinity between TMA molecule and sensor surface. It is expected that the oxygen doping strategy developed for the highly efficient gas sensors based on TMDs in present work may also be applicable to other types of gas-sensing semiconductors, which could open up a new direction for the rational design of high-performance gas sensors working under ambient condition.


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Electronic supplementary material
About this article

Fabrication of oxygen-doped MoSe2 hierarchical nanosheets for highly sensitive and selective detection of trace trimethylamine at room temperature in air

Show Author's information Nannan Hou1, Qianqian Sun1, Jing Yang1, Su You1, Yun Cheng1, Qian Xu2, Wei Li1, Shiqi Xing1, Li Zhang1, Junfa Zhu2, Qing Yang1( )
Hefei National Laboratory of Physical Sciences at the Microscale (HFNL), Department of Chemistry, Laboratory of Nanomaterials for Energy Conversion (LNEC), University of Science and Technology of China, Hefei 230026, China
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

Abstract

Intelligent gas sensors based on the layered transition metal dichalcogenides (TMDs) have attracted great interest in the field of gas sensing due to their multiple active sites, fast electron, mass transfer capability and large surface-to-volume ratio. However, conventional TMDs-based sensors typically work at elevated temperature in inert atmosphere, which would largely limit the corresponding practical applications. Herein, novel oxygen-doped MoSe2 hierarchical nanostructures composed of ultrathin nanosheets with large specific surface area have been designed and generated typically at 200 °C in air for fast and facile gas sensing of trimethylamine (TMA), effectively. Benefited from the gas-accessible hierarchical morphology and high surface area with abundant nanochannels, highly sensitive and selective detection of trace TMA has been achieved under ambient condition, and as detected the theoretical limit of detection (LOD) is 8 ppb, which is the lowest for TMA detection under ambient condition among the reported studies. The mechanism of oxygen doping on the improved gas-sensing performance has been investigated, revealing that the oxygen doping could greatly optimize the electronic structure, thus regulate the Fermi level of MoSe2 as well as the affinity between TMA molecule and sensor surface. It is expected that the oxygen doping strategy developed for the highly efficient gas sensors based on TMDs in present work may also be applicable to other types of gas-sensing semiconductors, which could open up a new direction for the rational design of high-performance gas sensors working under ambient condition.

Keywords: oxygen-doped MoSe2 nanosheet, ambient gas sensing, trimethylamine detection, highly selective, trace detection limit

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Publication history
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Acknowledgements

Publication history

Received: 22 December 2019
Revised: 09 March 2020
Accepted: 07 April 2020
Published: 28 April 2020
Issue date: June 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. U1932150 and 21571166), Anhui Provincial Natural Science Foundation (No. 1908085QB72) and the Fundamental Research Funds for the Central Universities (No. WK2060190099).

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