Journal
CERAMICS INTERNATIONAL
Volume 43, Issue -, Pages S541-S546Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.05.286
Keywords
Nanocomposites; Electrical properties; Sensors; Nanowire
Categories
Funding
- Ministry of Science and Technology (Taiwan) [MOST 102-2221-E-005-029-MY2, 104-2221-E-005-016-MY3]
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NiO/SnO2 hybrid nanowires showed an enhanced sensitivity against NO2 gas of ppm concentrations (5-15 ppm) when compared to pristine SnO2 counterpart without the NiO decoration. The hybrid structure involved uniform deposition of NiO nano-islands with a size less than 10 nm in diameter on surface of the SnO2 nanowires. A fivefold increase on the sensing response, i.e., from 1.65 to 9.34, was found for the NiO/SnO2 hybrid nanowires at NO2 concentration of 15 ppm at 250 degrees C. This is attributable to the formation of local p-n heterojunctions at the NiO/SnO2 interface so that an enlarged electronic depletion layer was resulted near the surface. Accordingly, the reduced channel width for carriers migration impeded electron transportation and led to the increased electrical resistance upon reacted with the dilute NO2 gas mixtures.
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