Journal
APPLIED SURFACE SCIENCE
Volume 349, Issue -, Pages 615-621Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.05.003
Keywords
ZnO nanotubes; In-2 O-3; Electrospinning; Ethanol; Gas sensors
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Funding
- National Science Foundation of China [61176058, U1232121, 51202100, 61404066]
- Fundamental Research Funds for the Central Universities [lzujbky-2015-202]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China
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Indium-doped ZnO (IZO) nanotubes with various indium contents (0.01-0.20) were synthesized via a facile electrospinning method. Results of X-ray diffraction and transmission electron microscopy demonstrate that all samples are consisted of hexagonal wurtzite-typed ZnO, showing a well-crystallized indium-zinc-oxide solid solution when only a small amount of zinc ions substituted by indium ions (0.01). Once the amount of indium dopants >= 0.05, there will form some amorphous In2O3, leading to a pronounced decrease in grain sizes. Gas-sensing performances revealed that the IZO nanotube-based sensors have enhanced ethanol-sensing characteristics, especially, sensor based on IZO-0.01 nanotubes shows the highest response (R-a/R-g = 81.7), which is twice that of the undoped ZnO nanotubes (40.0) toward 100 ppm ethanol at an operating temperature of 275 degrees C. And IZO-0.20 nanotube-based sensor presents a relatively high response at high ethanol concentrations. Our research suggested that these remarkable enhanced ethanol-sensing properties can be closely related to the formation of indium-zinc-oxide solid solutions and/or heterostructures between ZnO and amorphous In2O3. (C) 2015 Published by Elsevier B.V.
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