Journal
RSC ADVANCES
Volume 7, Issue 45, Pages 28542-28547Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra03864j
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Funding
- National Natural Science Foundation of China [51205274]
- National Natural Science of Shanxi Province Science [2016011039]
- Talent project of Shanxi Province [201605D211020]
- Higher School Science and Technology Innovation Project of Shanxi [2016137]
- Graduate Education Innovation Fund [02100738]
- Technology Major Project of the Shanxi and Technology Department [20121101004]
- Key Disciplines Construction in Colleges and Universities of Shanxi [[2012] 45]
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Flower-like molybdenum oxide@tungsten oxide (MoO3@WO3) composite microstructures were successfully synthesized by hydrothermal and impregnation methods. The fabricated samples were characterized by XRD, EDS, SEM and TEM, and the results show that the MoO3@WO3 composite is composed of crystallized nanosheets with a thickness of about 40 nm. The gas sensing properties of the MoO3@WO3 composite microstructures towards hydrogen sulfide (H2S) were investigated as a function of operating temperature and gas concentration. The gas sensors based on MoO3@WO3 composites show better sensing performances than that of a pure one. Moreover, the Mo6W-based gas sensor exhibits the highest response (28.5 towards 10 ppm H2S), fast response/recovery time (2 s/5 s), low detection limit (20 ppb) and good selectivity at optimum operating temperature (250 degrees C). Such an excellent performance can be attributed to the heterojunction between MoO3 and WO3.
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