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Issue 38, 2016
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A solid-state cation exchange reaction to form multiple metal oxide heterostructure nanowires

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Abstract

Metal oxide nanostructures have been investigated extensively due to their wide range of physical properties; zinc oxide is one of the most promising materials. It exhibits fascinating functional properties and various types of morphologies. In particular, ZnO heterostructures have attracted great attention because their performance can be modified and further improved by the addition of other materials. In this study, we successfully transformed ZnO nanowires (NWs) into multiple ZnO/Al2O3 heterostructure NWs via a solid-state cation exchange reaction. The experiment was carried out in situ via an ultrahigh vacuum transmission electron microscope (UHV-TEM), which was equipped with a video recorder. Moreover, we analyzed the structure and composition of the heterostructure NWs by Cs-corrected STEM equipped with EDS. Based on these experimental results, we inferred a cation exchange reaction ion path model. Additionally, we investigated the defects that appeared after the cation reaction, which resulted from the remaining zinc ions. These multiple heterostructure ZnO/Al2O3 NWs exhibited excellent UV sensing sensitivity and efficiency.

Graphical abstract: A solid-state cation exchange reaction to form multiple metal oxide heterostructure nanowires

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Publication details

The article was received on 15 Feb 2016, accepted on 30 Aug 2016 and first published on 01 Sep 2016


Article type: Paper
DOI: 10.1039/C6NR01287F
Nanoscale, 2016,8, 17039-17043

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    A solid-state cation exchange reaction to form multiple metal oxide heterostructure nanowires

    Y. H. Chen, C. W. Huang, P. H. Yeh, J. Y. Chen, T. Y. Lin, C. F. Chang and W. W. Wu, Nanoscale, 2016, 8, 17039
    DOI: 10.1039/C6NR01287F

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