scholarly journals Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity ofTiO2Nanoparticles Produced via Chemical Vapour Deposition

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Siti Hajar Othman ◽  
Suraya Abdul Rashid ◽  
Tinia Idaty Mohd Ghazi ◽  
Norhafizah Abdullah
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Uv Light ◽  
Chemical Vapour ◽  
Nanoparticle Size ◽  
Degree Of Crystallinity ◽  
Heat Treated

Titanium dioxide (TiO2) nanoparticles were produced using chemical vapour deposition (CVD) at different deposition temperatures (300–700°C). All the samples were heat treated at their respective deposition temperatures and at a fixed temperature of 400°C. A scanning electron microscope (SEM), a transmission electron microscope (TEM), and X-ray diffraction (XRD) were used to characterize the nanoparticles in terms of size and crystallinity. The photocatalytic activity was investigated via degradation of methylene blue under UV light. The effects of post deposition heat treatment are discussed in terms of crystallinity, nanoparticle size as well as photocatalytic activity. Crystallinity was found to have a much larger impact on photocatalytic activity compared to nanoparticle size. Samples having a higher degree of crystallinity were more photocatalytically active despite being relatively larger in size. Surprisingly, the photocatalytic activity of the samples reduced when heat treated at temperatures lower than the deposition temperature despite showing an improvement in crystallinity.

Self Seeded ZnO Nanowire Growth by Ultrasonic Spray Assisted Chemical Vapour Deposition

2005 ◽  
Vol 879 ◽  
Author(s):  
M. Wei ◽  
D. Zhi ◽  
J. L. MacManus-Driscoll
Keyword(s):  
Single Crystal ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Uv Light ◽  
Chemical Vapour ◽  
Nanowire Growth ◽  
Liquid Droplets ◽  
Zno Nanowire ◽  
Seeded Growth ◽  
Ultrasonic Spray

AbstractZnO, which exhibits a direct bandgap of 3.37 eV at room temperature with a large exciton binding energy of 60 meV,is of considerable technological importance because of its potential use in short-wavelength devices, such as ultraviolet (UV) light-emitting diodes and laser diodes. The fabrication and application of 1-D ZnO nanostructures has attracted considerable interest in recent years. In this work, we produced single crystal nanowires of zinc oxide using a novel self-seeded growth using ultrasonic spray assisted chemical vapour deposition, in which a nanocrystalline seed layer was first deposited onto a glass substrate and the nanowires subsequently grown using a different precursor concentration and substrate temperature. The diameter of the nanowires is in the range of 20-80 nm and the length of the wires is as long as 10 μm. The single crystal nature of the nanowires was revealed by high resolution transmission electron microscopy. The formation of liquid droplets due to the reducing atmosphere and the higher temperature during the nanowire growth was found to be the key step of the ZnO nanowire formation.

scholarly journals Optimization of growth temperature of multi-walled carbon nanotubes fabricated by chemical vapour deposition and their application for arsenic removal

2014 ◽  
Vol 32 (4) ◽  
pp. 709-718 ◽  
Author(s):  
S. Mageswari ◽  
S. Kalaiselvan ◽  
P. Syed Shabudeen ◽  
N. Sivakumar ◽  
S. Karthikeyan
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Spectral Studies ◽  
Outer Diameter ◽  
Chemical Vapour Deposition Technique ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractMulti-walled carbon nanotubes have been synthesized at different temperatures ranging from 550 °C to 750 °C on silica supported Fe-Mo catalyst by chemical vapour deposition technique using Cymbopogen flexuous oil under nitrogen atmosphere. The as-grown MWNTs were characterized by scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction analysis (XRD) and Raman spectral studies. The HRTEM and Raman spectroscopic studies confirmed the evolution of MWNTs with the outer diameter between 20 and 40 nm. The possibility of using as-grown MWNTs as an adsorbent for removal of As (V) ions from drinking water was studied. Adsorption isotherm data were interpreted by the Langmuir and Freundlich equations. Kinetic data were studied using Elovich, pseudo-first order and pseudo-second order equations in order to elucidate the reaction mechanism.

Aerosol assisted chemical vapour deposition of hydrophobic TiO2–SnO2 composite film with novel microstructure and enhanced photocatalytic activity

2013 ◽  
Vol 1 (20) ◽  
pp. 6271 ◽  
Author(s):  
Sapna Ponja ◽  
Sanjayan Sathasivam ◽  
Nicholas Chadwick ◽  
Andreas Kafizas ◽  
Salem M. Bawaked ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Composite Film ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour

Aerosol assisted chemical vapour deposition of a ZrO2–TiO2 composite thin film with enhanced photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 67944-67950 ◽  
Author(s):  
Abdullah M. Alotaibi ◽  
Sanjayan Sathasivam ◽  
Ivan P. Parkin
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Composite Thin Film ◽  
Photocatalytic Properties

ZrO2–TiO2 composite thin film deposited via aerosol assisted chemical vapour deposition showed enhanced photocatalytic activity compared to pure anatase TiO2. The photocatalytic properties were determined using resasurin redox dye.

Photocatalytic activity of needle-like TiO2/WO3−x thin films prepared by chemical vapour deposition

2012 ◽  
Vol 239 ◽  
pp. 60-64 ◽  
Author(s):  
Raul Quesada Cabrera ◽  
Elspeth R. Latimer ◽  
Andreas Kafizas ◽  
Christopher S. Blackman ◽  
Claire J. Carmalt ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour
Sign in / Sign up

Export Citation Format

Share Document