ZnO nanostructures with different morphologies e.g. nanotetrapods, nanorods, nanocombs and nanoaeroplanes has been fabricated by evaporation of pure zinc powder without catalysts in the temperature range of 400~900 °C. The structures and properties of obtained products were examined using scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, room temperature photoluminescence and field emission. Photoluminescence spectra showed an ultravoilet-green emission and strong orange-red emission peaks at room temperature. The field emission studies of the as grown nanocombs revealed that threshold field, required to draw a current density of ~1.0 μA/cm2 is ~ 1.4 V/μm. An emission current density of ~9.05 μA/cm2 has been drawn from nanocombs at an applied electric field of ~ 1.92 V/μm. The field enhancement factor found to be ~8050, indicating that the electron emission from nanometric dimension of the emitter. Such, ZnO nanostructures are likely to be candidates as building blocks for constructing photonic and flat panel display.
|Number of pages||12|
|Journal||Digest Journal of Nanomaterials and Biostructures|
|Publication status||Published - 2012|
- Current stability
- Field emission