Journal
CRYSTENGCOMM
Volume 18, Issue 41, Pages 8101-8107Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ce01621a
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Funding
- National Nature Science Foundation of China [61134010, 61327804, 61474057, 61520106003]
- National High-Tech Research and Development Program of China (863 Program) [2014AA06A505]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
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ZnO nanorod arrays decorated with NiO nanosheets on FTO substrates were prepared via a simple ultrasonic spray pyrolysis process combined with chemical bath method. The synthesized samples were characterized and analyzed by scanning electron microscopy and X-ray diffraction. The hierarchical and porous morphologies of ZnO/NiO core-shell nanoheterojunctions could be controlled by changing the growth time of NiO sheets. The oriented attachment and self-assembly crystal growth mechanisms were proposed to explain the formation of the ZnO/NiO nanostructures. Sensors based on the ZnO/NiO heterojunction nanostructure were fabricated and investigated for their ethanol-sensing properties. The result indicated that response was about 180% toward 100 ppm ethanol at an operating temperature of 200 degrees C. The growth approach in this work offers a new technique for the design and synthesis of transition metal oxide hierarchical nanoarrays which are promising for gas sensing applications.
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