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Browsing by Subject "Laser pyrolysis"

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Electrical and optical properties of mixed phase tungsten trioxide films grown by laser pyrolysis

Author: Govender, M ; Mwakikunga, Bonex W ; Machatine, AGJ ; Kunert, HW Date: Feb 2014 Laser pyrolysis was chosen to synthesize tungsten trioxide starting with tungsten ethoxide precursor. The film was found to have a thickness that varied from 205 nm to 1 µm. X-ray diffraction and Raman spectroscopy confirmed the presence of ... Read more
Flame temperature trends in reacting vanadium and tungsten ethoxide fluid sprays during CO2-laser pyrolysis

Author: Mwakikunga, Bonex W ; Mudau, AE ; Brink, N ; Willers, Cornelius J Date: Sep 2011 We observe the “invisible-to-the- naked-eye” flames of tungsten and vanadium ethoxide aerosols when ignited at moderate laser excitation (0 < Plaser< 70 W) by employing an IR thermo-graphic camera. No emission is seen in the visible range ... Read more
Formation of tungsten oxide nanostructures by laser pyrolysis: stars, fibres and spheres

Author: Govender, M ; Shikwambana, L ; Mwakikunga, Bonex W ; Sideras-Haddad, E ; Erasmus, RM ; Forbes, A Date: Jun 2010 This report focuses on the production of multi-phase WO3 and WO3-x (where x could vary between 0.2 and 0.33) nanostructures synthesized by CO2-laser pyrolysis technique at varying laser wavelengths (9.22-10.82 mm) and power densities (17-110 ... Read more
Optimization, yield studies and morphology of WO3 nano-wires synthesized by laser pyrolysis in C2H2 and O2 ambients—validation of a new growth mechanism

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Arendse, C Date: Oct 2008 Laser pyrolysis has been used to synthesize WO3 nanostructures. Spherical nano-particles were obtained when acetylene was used to carry the precursor droplet, whereas thin films were obtained at high flow-rates of oxygen carrier gas. In both ... Read more
Synthesis of tungsten oxide nano structures by laser pyrolysis

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Erasmus, RM ; Katumba, G ; Masina, Bathusile N Date: 2008 Since the proposal to synthesise materials by laser assisted pyrolysis in the 1970s, and its practical realisation in 1982, a number of researchers have used this method in obtaining nano-powders from liquid droplets. This study revisits this ... Read more

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Browsing by Subject "Laser pyrolysis"

Browsing by Subject "Laser pyrolysis"

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