Journal
RSC ADVANCES
Volume 2, Issue 27, Pages 10324-10329Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra21121a
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Funding
- National Natural Science Foundation of China [50872039]
- Natural Science Foundation of Hubei Province [2010CDB04005]
- National Natural Science Foundation of Jiangsu Province [BK2009724]
- Industry R&D program in Jiangsu Province [GY2009003]
- Center for Electron Microscopy of Wuhan University
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Novel ultra-fine NiO/SnO2 nano-particles (NPs) have been fabricated by creatively using carbon black (CB) as a frame and dispersing agent and applied as gas-sensing materials. In a typical synthesis, a precursor composed of mixed NiO/SnO2 NPs and CB was initially prepared. Subsequently, the ultra-fine NiO/SnO2 NPs were obtained by a thermal treatment of the precursor. The final products were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and Brunauer Emmett Teller N-2 adsorption-desorption analysis. The ethanol-sensing tests revealed that the ultra-fine NiO/SnO2 NPs used as gas sensors have a quick response/recovery capability (response time: 2-40 s; recovery time: 3-20 s) within a detecting range of 5-100 ppm at an operating temperature of 300 degrees C; strikingly, the response/recovery times are quite short (2 s and 3 s, respectively) even under the detection limit of 5 ppm. As demonstrated, the ultra-fine NiO/SnO2 NPs are highly promising for real-time monitoring gas sensor applications.
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