Document Details Document Type : Article In Journal  Document Title : Hierarchical ZnO nanostructures: Growth and optical properties Hierarchical ZnO nanostructures: Growth and optical properties   Subject : Physics  Document Language : English  Abstract : Growth of hierarchical ZnO nanostructures composed of ZnO nanoneedles have been achieved via simple thermal evaporation process by using metallic zinc powder in the presence of oxygen at low temperature of 460°C on silicon substrate without the use of any kind of metal catalysts or additives. It is confirmed by detailed structural studies that the as-grown hierarchical nanostructures are single crystalline with a wurtzite hexagonal phase and nanoneedles of these structures are grown along the c-axis in the [0001] direction. The Raman-scattering analysis substantiates a wurtzite hexagonal phase with a good crystal quality for the as-grown products. Room-temperature photoluminescence (PL) exhibits a strong UV emission at 380 nm confirming the excellent optical properties of as-synthesized hierarchical structures. A plausible growth mechanism is also proposed to clearly understand the growth process of the synthesized structures. Copyright © 2008 American Scientific Publishers All rights reserved.  ISSN : 1533-4880  Journal Name : Journal of Nanoscience and Nanotechnology, Volume 8, Issue 12, December 2008, Pages 6355-6360  Volume : 80  Issue Number : 12  Publishing Year : 2008 AH 2008 AD  Number Of Pages : 6  Article Type : Article  Added Date : Thursday, October 15, 2009  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email Umar, A Umar, A Researcher Doctorate   Al Hajry, A Al Hajry, A Researcher Doctorate   صالح هديهد سلمان الحنيطي Al-Heniti Researcher Doctorate salheniti@kau.edu.sa Hahn, Y.-B Hahn, Y.-B Researcher Doctorate   Back To Researches Page