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Ultralong ZnO nanocombs have been synthesized on silicon substrates with a high growth rate of ∼7 μm/s using a simple “thermal evaporation and condensation” method promoted by Cu catalysts. The lengths of the ZnO nanocombs range from several millimeters to more than one centimeter and the diameters of the branches are about 300 nm. The growth mechanism of the ultralong nanocombs and the catalytic...
Tetrapod-like zinc oxide (ZnO) nanoneedles were fabricated using a simple and economical method of rapid heating high purity zinc powders at 900 °C. No catalyst and vacuum were employed in the experiment. Field-emission measurements showed that the turn-on field of the synthesized tetrapod-like ZnO nanoneedles was as low as 1.8 V/μm at the emission current density of 1.0 μA/cm 2 and the emission...
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