Highly Sensitive NO2 Gas Sensors Based on MoS2@MoO3 Magnetic Heterostructure

Wei Li, Mahboobeh Shahbazi, Kaijian Xing, Tuquabo Tesfamichael, Nunzio Motta, Dong Chen Qi

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17 Citations (Scopus)

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 languageEnglish
Article number1303
Number of pages17
JournalNanomaterials
Volume12
Issue number8
DOIs
Publication statusPublished - 1 Apr 2022

Keywords

  • 2D materials
  • gas sensor
  • heterostructure
  • molybdenum disulfides
  • molybdenum trioxide
  • nitrogen dioxide
  • sulfurization

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