Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 269, Issue -, Pages 331-339Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.04.124
Keywords
MoO3; Metal oxide gas sensors; H2S detection; Thermal evaporation
Funding
- European Community [611887]
- CERIC Consortium [20162029]
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Molybdenum trioxide (MoO3) nano flakes (NF) with orthorhombic structure were synthesized by evaporation-condensation method using MoO3 powder as a raw material. Gold (Au) nanoparticles were used as a catalyst, preventing the growth of thick layers of MoO3. Furthermore, Au functionalization was performed by sputtering on pure MoO3 NF for a few seconds, decorating the flakes with Au nanoparticles. Chemical sensing performances were evaluated by introducing CO, NH3, Ethanol, NO2, Methanol, H-2 and H2S gases in a syntetic air baseline with a relative humidity of 40% at 25 degrees C. MoO3 NF shows good sensitivity to Ethanol, Methanol, H-2 and H2S gases. Owing to Au functionalization the devices exhibited an excellent response to H2S at an operating temperature of 400 degrees C: the response was 10 times higher than the pure MoO3, and the detection limit moved toward the ppb range. (c) 2018 Elsevier B.V. All rights reserved.
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