Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 47, Issue 12, Pages 7170-7178Publisher
SPRINGER
DOI: 10.1007/s11664-018-6648-0
Keywords
CuO nanoplates; hydrothermal; SO2 sensing; sensing mechanism
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Funding
- Hanoi University of Science and Technology [T2017-PC-171]
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CuO nanoplates were synthesized by a facile hydrothermal method for a SO2 gas-sensing application. The synthesized materials were characterized by field-emission scanning electron microscopy (FE-SEM), powder x-ray diffraction (XRD), Raman spectroscopy, and photoluminescence spectroscopy. Gas-sensing characteristics were measured at various concentrations of SO2 and H2S at 200-350 degrees C. The results showed that rectangular CuO nanoplates with an average size of approximately 700 x 500 x 30 nm(3) were synthesized. FE-SEM and XRD analyses also depicted that the nanoplates were polycrystalline with an average crystal size of 12.85 nm. Gas-sensing measurements demonstrated that the synthesized CuO nanoplates exhibited p-type semiconducting behavior, where the sensor resistance increased upon exposure to H2S and decreased when exposed to SO2. The sensor showed a considerably higher response to SO2 than to H2S in the measured concentrations ranging from 1 Wppm to 10 ppm, suggesting that the CuO nanoplates are suitable for high-sensitivity SO2 sensing. We also clarified the sensing mechanism of the CuO nanoplate-based SO2 sensors.
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