Well-aligned ZnO microprism arrays with umbrella-like tips: Low-temperature preparation, structure and UV photoluminescence improvement
ABSTRACT Catalyst-free, low-temperature (430 °C), high-density, well-aligned, single-crystalline zinc oxide (ZnO) microprism (ZMP) arrays have been synthesized over the entire c-ZnO/poly-Zn-coated Si substrates by simple thermal evaporation of Zn powder. Specially, the microprisms obtained possess hexagonal umbrella-like tips on which vertical thin ZnO nanowires grow. The growth mechanism of a three-stage thermodynamic process was discussed. Photoluminescence spectra show a strong ultraviolet (UV) emission enhancement of the ZMPs after H+ (hydrogen ions) implantation. This kind of special ZnO microstructure may find potential applications in field emission, UV laser emission devices, multifunctional microdevices and highly integrated multichannel nano-optoelectronic devices.
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ABSTRACT: ZnO acicular nanostructure was designed and grown from aqueous solution on the conductive substrate. The diameter of ZnO was 50 nm and length was about 5 mum. due to the large aspect ratio, the as-prepare ZnO sample was applied in filed emission with turn-on electric intensity of 3.2 V/mum and enhancement factor beta of 2830.01/2009;