Growth and Properties of Ultra-Violet Emitting Aligned Zinc Oxide Nanocones with Hexagonal Caps
Authors: Umar, Ahmad; Hajry, A. Al.; Al-Ghamdi, A. A.; Al-Heniti, S.
Source: Journal of Nanoscience and Nanotechnology, Volume 10, Number 10, October 2010 , pp. 6659-6665(7)
Publisher: American Scientific Publishers
Abstract:Ultraviolet-emitting, single-crystalline aligned zinc oxide (ZnO) nanocones with hexagonal caps were grown on silicon substrate via simple non-catalytic thermal evaporation process. High-purity metallic zinc powder and oxygen were used as source materials for zinc and oxygen, respectively. The detailed structural characterizations confirmed that the formed products are single-crystalline, possess a wurtzite hexagonal phase and grown along the c-axis direction. Raman-active optical-phonon Ehigh2 mode at 437 cm−1 with sharp and strong UV emission at 385 nm in room-temperature photoluminescence (PL) spectrum demonstrated that the as-grown ZnO nanocones with hexagonal caps possess good-crystal quality with the excellent optical properties. Finally, a plausible growth mechanism for the formation of as-grown ZnO nanocones with hexagonal caps was also proposed.
Document Type: Research Article
Publication date: October 1, 2010
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