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Issue 37, 2011
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Fabrication of ZnO nanorod-assembled multishelled hollow spheres and enhanced performance in gas sensor

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Abstract

In this work, ZnO multishelled hollow spheres with an average diameter of 5 μm were prepared by a facile solvothermal process in a ternary solvent system including water, ethanol and ethylene, and as-synthesized products were constructed by highly directional interactions of anisotropic single-crystalline ZnO nanorods. A two-step assembly process followed symmetric Ostwald ripening process is proposed to explain the formation mechanism of obtained products, which highlights the driving force of the solvents in promoting the nanorod aggregation and the solid evacuation of final products. Scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy were used to characterize the structure of synthesized products. The investigation of the gas-sensing properties indicated that control of the shape-defined building units and their assembled structure provides ZnO with high performance in gas sensing, and the double-wall hollow structures exhibit the highest sensitivity to formaldehyde gas than the nanorods and hollow spheres, which is contributed to their high donor-related and the low acceptor-related intrinsic defects in ZnO crystals.

Graphical abstract: Fabrication of ZnO nanorod-assembled multishelled hollow spheres and enhanced performance in gas sensor

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Publication details

The article was received on 02 May 2011, accepted on 13 Jun 2011 and first published on 02 Aug 2011


Article type: Paper
DOI: 10.1039/C1JM11919B
Citation: J. Mater. Chem., 2011,21, 14277-14284
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    Fabrication of ZnO nanorod-assembled multishelled hollow spheres and enhanced performance in gas sensor

    P. Hu, N. Han, X. Zhang, M. Yao, Y. Cao, A. Zuo, G. Yang and F. Yuan, J. Mater. Chem., 2011, 21, 14277
    DOI: 10.1039/C1JM11919B

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