Fabrication and characterization of self-organized porous TiO2 particle layers

• Published in: Materials letters Vol. 70; pp. 160 - 162
• Main Authors: Nakata, Kazuya, Sakai, Munetoshi, Ochiai, Tsuyoshi, Murakami, Taketoshi, Takagi, Katsuhiko, Fujishima, Akira
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2012
• Subjects: air; Calcination; Ceramics; cooling; Cross sections; Delaminating; Delamination; Particle layer; Porous structure; Scanning electron microscopy; Sintering; Spontaneous; temperature; TiO2; Titanium dioxide; Particle layer; Porous structure; Ceramics; Sintering; TiO2
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2011.12.016

Self-organized porous TiO2 particle layers were fabricated by simple calcination of a Ti substrate in air. The TiO2 particle layers were formed by calcination at 800°C for 24h or 900°C for 1h. Calcination at 900°C for more than 6h, or at more than 1000°C for more than 20min, gives not only the formation of TiO2 particle layers, but also spontaneous delamination of the TiO2 particle layers from the substrate on cooling to room temperature. The crystal phase of the TiO2 particle layers is rutile. Cross-section scanning electron microscopy (SEM) images revealed that the TiO2 particle layers after spontaneous delamination have porous structure between the TiO2 particle layers. The thicknesses of the TiO2 layers increase with increasing calcination temperature and time. The sizes of the TiO2 particles depend on the calcination temperature and time.
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► Self-organized porous TiO2 particle layers were fabricated by calcination of a Ti substrate. ► Cooling after the calcination gives spontaneous delamination of TiO2 particles layers. ► The TiO2 particle layers have porous structure. ► The sizes of the TiO2 particles depend on the calcination temperature and time.