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Title: Cu-doped ZnO nanoneedles and nanonails: Morphological evolution and physical properties
Authors: Zhang, Z.
Yi, J.B. 
Ding, J. 
Wong, L.M.
Seng, H.L.
Wang, S.J.
Tao, J.G.
Li, G.P.
Xing, G.Z.
Sum, T.C.
Huan, C.H.A.
Wu, T.
Issue Date: 3-Jul-2008
Source: Zhang, Z., Yi, J.B., Ding, J., Wong, L.M., Seng, H.L., Wang, S.J., Tao, J.G., Li, G.P., Xing, G.Z., Sum, T.C., Huan, C.H.A., Wu, T. (2008-07-03). Cu-doped ZnO nanoneedles and nanonails: Morphological evolution and physical properties. Journal of Physical Chemistry C 112 (26) : 9579-9585. ScholarBank@NUS Repository.
Abstract: Controlling novel morphologies and developing effective doping strategies are two important tasks for advancing ZnO-based nanomaterials. We have grown vertically aligned Cu-doped ZnO nanonails and nanoneedles and observed a continuous evolution between various morphologies. Selecting source compositions and regulating vapor and gas pressures modify the Ehrlich-Schwoebel energy barrier for the surface diffusion and determine the morphologies. X-ray diffraction study indicates a decrease in the lattice parameter after the Cu doping. Photoluminescence measurements taken on both doped and undoped samples show that, in the Cu-doped ZnO nanostructures, the band-edge UV emission and the broad green emission are red-shifted by ~7 and 20 nm, respectively. X-ray photoelectron spectroscopy study revealed a higher level of oxygen vacancies in nanoneedles, which was found to enhance the green emission. Room-temperature ferromagnetism was also observed in Cu-doped ZnO nanomaterials. On the basis of the strong correlations between structures and properties, we demonstrate that the morphologies and the optical and magnetic characteristics can be tailored to a large degree in transition-metal-doped ZnO nanostructures. © 2008 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp710837h
Appears in Collections:Staff Publications

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