Journal
MICROCHIMICA ACTA
Volume 186, Issue 4, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3335-7
Keywords
Gas sensing; Heterostructure; Partial catalytic oxidation; Cobalt oxide; Nickel molybdenum oxide; Synergistic effect; Hydrothermal synthesis; Semiconductors
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Funding
- National Key Research and Development Plan [2016YFB0101205]
- Key Program of the Chinese Academy of Sciences [KFZD-SW-320]
- Opened Fund of the State Key Laboratory on Integrated Optoelectronics [IOSKL2017KF08M]
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Hierarchical Co3O4@NiMoO4 core-shell nanowires (NWs) were synthesized utilizing a two-step hydrothermal method. The NWs show a high chemiresistive response (at a temperature of 255 degrees C) to xylene, with an R-gas/R-air ratio of 24.6 at 100ppm xylene, while the response towards toluene, benzene, ethanol, and acetone, CO, H2S and NO2 is much weaker. In contrast, pure Co3O4 nanowires exhibit weak responses to all the vapors/gases and poor selectivity. The new NW sensor displays an almost linear response (1-100ppm) to xylene and a lower detection limit of 424ppb. The remarkable gas sensing characteristics are attributed to the synergistic catalytic effect and the formation of a heterostructure between Co3O4 and NiMoO4.
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