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Issue 41, 2016
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Hierarchical core/shell ZnO/NiO nanoheterojunctions synthesized by ultrasonic spray pyrolysis and their gas-sensing performance

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Abstract

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 °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.

Graphical abstract: Hierarchical core/shell ZnO/NiO nanoheterojunctions synthesized by ultrasonic spray pyrolysis and their gas-sensing performance

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Publication details

The article was received on 22 Jul 2016, accepted on 19 Sep 2016 and first published on 19 Sep 2016


Article type: Paper
DOI: 10.1039/C6CE01621A
Citation: CrystEngComm, 2016,18, 8101-8107

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    Hierarchical core/shell ZnO/NiO nanoheterojunctions synthesized by ultrasonic spray pyrolysis and their gas-sensing performance

    D. Li, Y. Zhang, D. Liu, S. Yao, F. Liu, B. Wang, P. Sun, Y. Gao, X. Chuai and G. Lu, CrystEngComm, 2016, 18, 8101
    DOI: 10.1039/C6CE01621A

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