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

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Nano Research 2020年第6期13卷 1704-1712页

作者： Nannan Hou Qianqian Sun Jing Yang Su You Yun Cheng Qian Xu Wei Li Shiqi Xing Li Zhang Junfa Zhu Qing Yang Hefei National Laboratory of Physical Sciences at the Microscale(HFNL) Department of ChemistryLaboratory of Nanomaterials for Energy Conversion(LNEC)University of Science and Technology of ChinaHefei230026China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei230029China

Nano Research volume 13,pages1704–1712(2020)Cite this article 191 Accesses Metrics details 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 ***,conventional TMDs-based sensors typically work at elevated temperature in inert atmosphere,which would largely limit the corresponding practical ***,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),*** 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 *** 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 *** 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.

关键词： oxygen-doped MoSe2 nanosheet ambient gas sensing trimethylamine detection highly selective trace detection limit

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