Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 2, Pages 1626-1634Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c03094
Keywords
gas sensors; WS2-WO3 nanohybrids; room temperature; long-term stability; p-n heterojunctions
Funding
- National Natural Science Foundation of China [61971284, 61671299, 21703267]
- Oceanic Interdisciplinary Program of Shanghai Jiao Tong University [SL2020ZD203, SL2020MS031]
- Scientific Research Fund of Second Institute of Oceanography, MNR [SL2003]
- Startup Fund for Youngman Research of Shanghai Jiao Tong University [AF0300285]
- Instrumental Analysis Center of Shanghai Jiao Tong University
- Center for Advanced Electronic Materials and Devices of Shanghai Jiao Tong University
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A facile and practical strategy has been developed to construct reliable WS2 sensing devices with good stability under humidity conditions. The WS2-WO3 nanohybrid shows enhanced response and recoverability compared to WS2 sensors, attributed to its special hierarchical structure and p-n heterojunctions. This study offers a perspective for designing TMD-based gas sensors with enhanced NO2-sensing performance and environmental stability.
Two-dimensional (2D) transition metal dichalcogenide (TMD)-based gas sensors have received much attention due to their high sensitivity at room temperature. However, the long-term stability is limited by their poor stability against oxidation and hydration. This work develops a facile and practical strategy for the construction of reliable WS2-sensing devices under air conditions. A surface functionalization strategy for WS2 nanoflakes has been demonstrated, where WO3 nanosheets are aligned on the surface of WS2 nanoflakes via a facile sonochemical method. The synthesis method and structure-response relationship of the WS2-WO3 nanohybrid are carefully studied. The optimal device displays brilliant long-term stability and relatively stable sensing characteristics under the humidity conditions. Moreover, the WS2-WO3 sensor exhibits a remarkably enhanced response, a quick response time, and an excellent recoverability compared with the WS2 sensor. The impressive NO2-sensing performance of the WS2-WO3 nanohybrid is ascribed to the special hierarchical structure, the strong interlayer electronic coupling, and the formed p-n heterojunctions. This study offers a perspective for the structural design of TMD-based gas sensors, which exhibit not only an enhanced NO2-sensing performance but also an environmental stability.
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