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The preparation and characterization of photocatalytically active TiO2 thin films and nanoparticles using Successive-Ionic-Layer-Adsorption-and-Reaction |
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| Authors: | Sangmoon Park Elaine DiMasi Weiqiang Han Thomas Vogt |
| Affiliation: | a NanoCenter, University of South Carolina, 1212 Green Street, Columbia, SC, 29208-0001, USA b Condensed Matter Physics and Materials Sciences Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA c National Synchrotron Light Source Department, Brookhaven National Laboratory, Upton, New York, 11973-5000, USA d Department of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185, USA e Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973-5000, USA f Department of Chemistry & Biochemistry, University of South Carolina, 631 Sumter Street,Columbia, SC, 29208-0001, USA |
| Abstract: | Photocatalytically active TiO2 thin-films were deposited on silicon wafers using the Successive-Ionic-Layer-Adsorption-and-Reaction technique and subsequent hydrothermal and/or furnace annealing. Atomic-force-microscopy images and X-ray diffraction measurements of the TiO2 films obtained under various annealing conditions show how changes of the micro-scale surface structure depend on the post-SILAR treatment. The hydrogen evolution over various TiO2 films was measured. Hydrothermally treated TiO2 films show a higher photocatalytic activity and a much better mechanical stability compared to furnace-annealed films. The optical transmittance of TiO2 thin films on glass substrates was also studied. A red shift was observed with increasing film thickness. TiO2 nanoparticles (∼10 nm) that were peeled off from the TiO2 films were investigated using high-resolution-transmission-electron-microscopy. |
| Keywords: | Titanium oxide Deposition process Heat treatment Photocatalysis |
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