Formation of TiO_2 Hollow Nanoparticles via Gas Phase Synthesis using Titanium Oxide Acetylacetonate as a Precursor(Synthesis and Processing,<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)

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TiO_2 nanoparticles were synthesized by chemical vapor condensation (CVC) using titanium oxide acetylacetonate as a precursor in the temperature range of 800-1000℃. TEM observation revealed that TiO_2 nanoparticles 10-40nm in diameter consisted of a hollow structure with shells 4-5nm in thickness. From XRD results, it was found that TiO_2 nanopowders obtained at all temperatures consisted of a two-phase rutile and anatase mixture. The sequential decomposition of the metal acetylacetonate precursor observed in thermogravimetry (TG) analysis showed that formation of the hollow structure depends on the characteristics of the metalorganic precursor. In addition, it was found that the transmittance of TiO_2 hollow nanoparticles is lower than that of commercial nanopowders in the wavelength range of 400-800nm by UV-visible spectrophotometry. However, the band gap energy of the TiO_2 hollow nanoparticles at about 3.0eV is unchanged from other forms of TiO_2.
社団法人日本セラミックス協会の論文
2006-11-01