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- Title
Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO<sub>2</sub> Nanoparticles Produced via Chemical Vapour Deposition.
- Authors
Othman, Siti Hajar; Rashid, Suraya Abdul; Ghazi, Tinia Idaty Mohd; Abdullah, Norhafizah
- Abstract
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.
- Subjects
TITANIUM dioxide; CHEMICAL vapor deposition; SCANNING electron microscopes; TRANSMISSION electron microscopes; NANOPARTICLES
- Publication
Journal of Nanomaterials, 2010, p1
- ISSN
1687-4110
- Publication type
Article
- DOI
10.1155/2010/512785