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ZnO nanowires from nanopillars: influence of growth time
, Article Current Nanoscience ; Volume 5, Issue 4 , 2009 , Pages 479-484 ; 15734137 (ISSN) ; Roozbehi, M ; Akhavan, O ; Moshfegh, A. R ; Sharif University of Technology
2009
Abstract
A double-tube vapor phase transport system has been used to grow ZnO nanostructures. Nanopillars, nanorods and nanowires of zinc oxide were synthesized on Au nanoparticle catalyst depending on source-substrate distance and temperature gradient in the quartz tube. In addition, influence of growth time and substrate temperature on the morphology of the nanorods and nanowires were also investigated. The scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were employed to further understand the nanostructures growth mechanism on various temperatures and growth time steps. Longer length (>4μm) with hexagonal-cross-sectional nanowires, in [002]...
Formation of gold nanoparticles in heat-treated reactive co-sputtered Au-SiO 2 thin films
, Article Applied Surface Science ; Volume 254, Issue 1 SPEC. ISS , 2007 , Pages 286-290 ; 01694332 (ISSN) ; Akhavan, O ; Moshfegh, A. Z ; Roozbehi, M ; Sharif University of Technology
Elsevier
2007
Abstract
In this work, formation of gold nanoparticles in radio frequency (RF) reactive magnetron co-sputtered Au-SiO 2 thin films post annealed at different temperatures in Ar + H 2 atmosphere has been investigated. Optical, surface topography, chemical state and crystalline properties of the prepared films were analyzed by using UV-visible spectrophotometry, atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and X-ray diffractometry (XRD) techniques, respectively. Optical absorption spectrum of the Au-SiO 2 thin films annealed at 800 °C showed one surface plasmon resonance (SPR) absorption peak located at 520 nm relating to gold nanoparticles. According to XPS analysis, it was...