Controlling morphology, mesoporosity, crystallinity, and photocatalytic activity of ordered mesoporous TiO{sub 2} films prepared at low temperature

Journal Article · Sat Nov 01 00:00:00 EDT 2014 · APL Materials

DOI:https://doi.org/10.1063/1.4899117· OSTI ID:22303413

Elgh, Björn; Yuan, Ning; Palmqvist, Anders E. C. ^[1]; Cho, Hae Sung; Terasaki, Osamu ^[2]; Magerl, David; Philipp, Martine; Müller-Buschbaum, Peter ^[3]; Roth, Stephan V. ^[4]; Yoon, Kyung Byung ^[5]

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1. Applied Surface Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE 412 96 Göteborg (Sweden)
2. Graduate School of EEWS (WCU), KAIST, Daejeon 305-701 (Korea, Republic of)
3. Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, 85748 Garching (Germany)
4. DESY, Notkestrasse 85, 22603 Hamburg (Germany)
5. Department of Chemistry, Sogang University, Seoul 121-742 (Korea, Republic of)

Partly ordered mesoporous titania films with anatase crystallites incorporated into the pore walls were prepared at low temperature by spin-coating a microemulsion-based reaction solution. The effect of relative humidity employed during aging of the prepared films was studied using SEM, TEM, and grazing incidence small angle X-ray scattering to evaluate the mesoscopic order, porosity, and crystallinity of the films. The study shows unambiguously that crystal growth occurs mainly during storage of the films and proceeds at room temperature largely depending on relative humidity. Porosity, pore size, mesoscopic order, crystallinity, and photocatalytic activity of the films increased with relative humidity up to an optimum around 75%.

• OSTI ID: 22303413
• Journal Information: APL Materials, Vol. 2, Issue 11; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CRYSTAL GROWTH
FILMS
HUMIDITY
MICROEMULSIONS
NANOSTRUCTURES
PHOTOCATALYSIS
POROSITY
SCANNING ELECTRON MICROSCOPY
SMALL ANGLE SCATTERING
SPIN-ON COATING
TEMPERATURE RANGE 0065-0273 K
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION