Journal
NANOSCALE RESEARCH LETTERS
Volume 8, Issue -, Pages 1-9Publisher
SPRINGEROPEN
DOI: 10.1186/1556-276X-8-46
Keywords
Cu-doped ZnO; Micro-cross structures; Optical properties; Epitaxial growth; Catalyst-free vapor-phase method
Funding
- National Major Basic Research Project [2012CB934302]
- Natural Science Foundation of China [11174202, 61234005]
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We report a simple catalyst-free vapor-phase method to fabricate Zn1-x Cu (x) O micro-cross structures. Through a series of controlled experiments by changing the location of the substrate and reaction time, we have realized the continuous evolution of product morphology from nanorods into brush-like structures and micro-cross structures at different positions, together with the epitaxial growth of branched nanorods from the central stem with the time extended. The growth mechanism of the Zn1-x Cu (x) O micro-cross structures has been proposed to involve the synthesis of Cu/Zn square-like core, surface oxidation, and the secondary growth of nanorod arrays. By the detailed structural analysis of the yielded Zn1-x Cu (x) O samples at different locations, we have shown that the CuO phases were gradually formed in Zn1-x Cu (x) O, which is significant to induce the usual ZnO hexagonal structures changing into four-folded symmetrical hierarchical micro-cross structures. Furthermore, the visible luminescence can be greatly enhanced by the introduction of Cu, and the observed inhomogeneous cathode luminescence in an individual micro-cross structure is caused by the different distributions of Cu.
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