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Morphology of tubular ZnO. (a) Scanning electron microscopy and (b) high-resolution transmission electron microscopy morphology of a single ZnO tube, bar: ; (c) the edge of a ZnO tube; (d) electron diffraction pattern shows a wurtzite single-crystalline structure.
Micro-Raman spectrum of a single ZnO microtube.
(Color online) (a) PL spectra at different excitation wavelengths. The inset shows a weak PL peak at . (b) The dependence of the photon energy (the solid circles) and the intensity (the open squares) of the PL peak on the excitation wavelength.
(Color online) (a) Two-photon-induced PL spectra excited by nanosecond beam at different excitation powers, the inset is a schematic diagram of the electron transitions. (b) The intensity of PL emission at vs the square of the average excitation power.
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