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

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%.
Authors:
; ;  [1] ; ;  [2] ; ; ;  [3] ;  [4] ;  [5]
  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)
Publication Date:
OSTI Identifier:
22303413
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 11; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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