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Microspheres covered with ZnO nanowires were fabricated by oxidative evaporation of pure zinc powder with- out catalyst at 450°C. X-ray diffraction (XRD) demonstrates that the as-obtained sample can be indexed to high crystallinity with wurtzite structure. The structural features associated with different growth stages were monitored using scanning elec- tron microscope (SEM), which described the direct observation nucleation and growth process. Meanwhile, room tempera- ture photoluminescence (PL) spectrum showed a UV emission at ~388 nm and a broad green emission at ~505 nm. The ZnO nanowires with the self-catalyzed growth mechanism were discussed in detail.
Microspheres covered with ZnO nanowires were fabricated by oxidative evaporation of pure zinc powder with-out catalyst at 450 ° C. X-ray diffraction (XRD) demonstrated that the as-obtained sample can be indexed to high crystallinity with wurtzite structure. The structural features associated with different growth stages were monitored using scanning elec-tron microscope (SEM), which described the direct observation nucleation and growth process. Meanwhile, room tempera ture photoluminescence (PL) spectrum showed a UV emission at ~ 388 nm and a broad green emission at ~ 505 nm. The ZnO nanowires with the self-catalyzed growth mechanism were discussed in detail.