Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition
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 tran...
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doaj-39b993bb64ca42aab7cd4318042d61332020-11-25T01:58:24ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292010-01-01201010.1155/2010/512785512785Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour DepositionSiti Hajar Othman0Suraya Abdul Rashid1Tinia Idaty Mohd Ghazi2Norhafizah Abdullah3Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Putra, 43400 Serdang, Selangor, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, University of Putra, 43400 Serdang, Selangor, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, University of Putra, 43400 Serdang, Selangor, MalaysiaDepartment of Chemical and Environmental Engineering, Faculty of Engineering, University of Putra, 43400 Serdang, Selangor, MalaysiaTitanium 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.http://dx.doi.org/10.1155/2010/512785 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Siti Hajar Othman Suraya Abdul Rashid Tinia Idaty Mohd Ghazi Norhafizah Abdullah |
spellingShingle |
Siti Hajar Othman Suraya Abdul Rashid Tinia Idaty Mohd Ghazi Norhafizah Abdullah Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition Journal of Nanomaterials |
author_facet |
Siti Hajar Othman Suraya Abdul Rashid Tinia Idaty Mohd Ghazi Norhafizah Abdullah |
author_sort |
Siti Hajar Othman |
title |
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition |
title_short |
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition |
title_full |
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition |
title_fullStr |
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition |
title_full_unstemmed |
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO2 Nanoparticles Produced via Chemical Vapour Deposition |
title_sort |
effect of postdeposition heat treatment on the crystallinity, size, and photocatalytic activity of tio2 nanoparticles produced via chemical vapour deposition |
publisher |
Hindawi Limited |
series |
Journal of Nanomaterials |
issn |
1687-4110 1687-4129 |
publishDate |
2010-01-01 |
description |
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. |
url |
http://dx.doi.org/10.1155/2010/512785 |
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