Abstract
Recently, two-dimensional (2D) materials and their heterostructures have attracted con-siderable attention in gas sensing applications. In this work, we synthesized 2D MoS2-MoO3 heter-ostructures through post-sulfurization of α-MoO3 nanoribbons grown via vapor phase transport (VPT) and demonstrated highly sensitive NO2 gas sensors based on the hybrid heterostructures. The morphological, structural, and compositional properties of the MoS2-MoO3 hybrids were studied by a combination of advanced characterization techniques revealing a core-shell structure with the coexistence of 2H-MoS2 multilayers and intermediate molybdenum oxysulfides on the surface of α-MoO3. The MoS2@MoO3 hybrids also exhibit room-temperature ferromagnetism, revealed by vibrat-ing sample magnetometry (VSM), as a result of the sulfurization process. The MoS2@MoO3 gas sensors display a p-type-like response towards NO2 with a detection limit of 0.15 ppm at a working temperature of 125 °C, as well as superb selectivity and reversibility. This p-type-like sensing behavior is attributed to the heterointerface of MoS2-MoO3 where interfacial charge transfer leads to a p-type inversion layer in MoS2, and is enhanced by magnetic dipole interactions between the para-magnetic NO2 and the ferromagnetic sensing layer. Our study demonstrates the promising application of 2D molybdenum hybrid compounds in gas sensing applications with a unique combination of electronic and magnetic properties.
Original language | English |
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Article number | 1303 |
Number of pages | 17 |
Journal | Nanomaterials |
Volume | 12 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Apr 2022 |
Keywords
- 2D materials
- gas sensor
- heterostructure
- molybdenum disulfides
- molybdenum trioxide
- nitrogen dioxide
- sulfurization