Characterization and Photocatalytic Properties of Plasma Sprayed TiO₂ Coatings Deposited from Nanoparticles

Abstract:

The phase and microstructure of four kinds of plasma sprayed TiO2 coatings (P25, ST, NK, KT) were characterized by XRD (X-ray Diffraction), FE-SEM (Field Emission Scanning Electron Microscope) and TEM ( Transmission Electron Microscopy). Their photocatalytic properties were discussed in relation to phase composition and microstructure. The FE-SEM observation results reveal that there are quite a number of nanoparticles on the surfaces of all four kinds of plasma sprayed TiO2 coatings, which provide photocatalytic reactive sites. Based on the observation results of FE-SEM and TEM, the microstructure schematic of plasma sprayed TiO2 coatings using nanoparticles as feedstock is suggested. The best photocatalytic property of P25 coating among the four plasma sprayed TiO2 coatings is attributed to the combination of its fine “cauliflower” structure and the highest anatase content.

• Periodical: Key Engineering Materials (Volumes 317-318)
• Pages: 561-564
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.317-318.561
• Online since: August 2006
• Authors: Huang Chen, Tae Ho Kim, Soo Wohn Lee, Ho Sung Aum, Bo Young Hur, Yi Zeng, Chuan Xian Ding
• Keywords: Characterization, Photocatalytic, Plasma Spraying, TiO₂ Coating

References

[1] A. Fujishima, K. Hashimoto, T. Watanabe: TiO2 Photocatalysis fundamentals and applications (BKC, Inc., Tokyo 1999).

[2] A. Mills, S. L. Hunte: J. Photochem. Photobio. A: Chem. Vol. 108 (1997), p.1.

[3] E. A. Lee, S. W. Lee, C. H. Choi, et al.: Mater. Sci. Forum Vol. 439 (2003), p.288.

[4] C. H. Lee, H. S. Choi, C. H. Lee, et al.: Surf. Coat. Technol. Vol. 173 (2003), p.192.