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(a) Low-magnification SEM image and (b) high-magnification SEM image of ZnO nanorods as-deposited on silicon substrates by thermally decomposing zinc acetate in the air at , of which the inset is HRTEM of the ZnO nanorod; (c) and (d) high-magnification SEM images showing the morphology of the ZnO nanorods after an hour annealing at a temperature of 750 and , respectively.
(a) PL spectra of the ZnO nanorods after annealing at various temperatures. Inset is an augmented spectrum of the ZnO nanorods after annealing at ; (b) PL spectra of the ZnO after annealing at , excited with various laser powers, of which the full power is the ; (c) the relative intensity of the (line connected by solid circle) and (line connected by solid square) light emission as a function of the excitation laser power.
The morphology change of the ZnO nanorods after annealing at for (a) and (b) , respectively. (c) The corresponding PL spectra of the two samples. Inset of (c) is an enlarged part of the PL spectra within .
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