Critical effect of aging condition on mesostructural ordering in mesoporous titania thin film

• Published in: Thin solid films Vol. 518; no. 23; pp. 6714 - 6719
• Main Authors: Oveisi, Hamid, Suzuki, Norihiro, Nemoto, Yoshihiro, Srinivasu, Pavuluri, Beitollahi, Ali, Yamauchi, Yusuke
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.09.2010; Elsevier
• Subjects: Calcination; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Humidity; Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids); Materials science; Mesoporous film; Mesoporous material; Methods of deposition of films and coatings; film growth and epitaxy; Optimization; Order disorder; Physics; Precursors; Roasting; Shrinkage; Structure of solids and liquids; crystallography; Thin films; Titania; Titanium dioxide; X-ray diffraction and scattering; X-ray scattering (including small-angle scattering); Titania; Mesoporous material; Mesoporous film; Temperature dependence; Cubic lattices; Order-disorder transformations; pH value; Grazing incidence; Porous materials; Shrinkage; Small angle X ray scattering; Precursor; Mesoporosity; Thin films; Humidity; Ordering; Spin-on coating; Incidence angle; Titanium oxide; Sol-gel process
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2010.05.112

Here we demonstrate facile synthesis method for formation of highly ordered mesoporous cubic Im–3 m titania thin film. The mesostructural ordering is strongly dependent on the aging condition after the spin-coating. The aging condition under low temperature and low humidity is found as an optimum condition for achieving highly ordered mesostructure in titania thin films. The effects of other important synthetic parameters, such as pH of the precursor solutions and aging periods, on the mesostructural ordering are carefully examined. After the calcination, continuous mesoporous films with partially crystallized frameworks are formed without any cracks. The mesostructure of the calcined films is formed by thermal shrinkage of the original Im–3 m mesostructure. The mesostructural change in the films calcined at various temperatures are studied by using the grazing-incidence small-angle X-ray scattering (GI-SAXS). The GI-SAXS patterns show the strong shrinkage along the perpendicular direction to the substrate by increasing the calcination temperature.