Authors: Lee, Chia Ying; Li, Seu Yi; Lin, Pang; Tseng, Tseung Yuen

Source: Journal of Nanoscience and Nanotechnology, Volume 5, Number 7, July 2005 , pp. 1088-1094(7)

Publisher: American Scientific Publishers

Abstract:

Zinc oxide nanowires (ZnO NWs) were successfully synthesized on the ITO/PET polymer substrates by a hydrothermal method. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy investigations were carried out to characterize the crystallinity, surface morphologies, and orientations of these NWs, respectively. The influence of NW surface morphologies on the optical and electrical properties of ZnO NWs was studied. The hydrothermally grown ZnO NWs with direct band gap of 3.21 eV emitted ultraviolet photoluminescence of 406 nm at room temperature. Field emission measurements revealed that the threshold electric fields (E_th, current density of 1 mA/cm²) of ZnO NWs/ITO/PET and ZnO NWs/ZnO/ITO/PET are 1.6 and 2.2 V/m with the enhancement factors, values, of 3275 and 4502, respectively. Furthermore, the field emission performance of ZnO NWs deposited on the ITO/PET substrate can be enhanced by illumination with E_th of 1.3 V/m and displays a maximum emission current density of 18 mA/cm². The ZnO NWs successfully grown on polymer substrate with high transmittance, low threshold electric field, and high emission current density may be applied to a flexible field emission display in the future.

Keywords: ZNO; NANOWIRES; POLYMER SUBSTRATE; HYDROTHERMAL METHOD; PHOTOLUMINESCENCE; FIELD EMISSION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2005.164

Publication date: 2005-07-01

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• Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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