Surface Modification of Titania Nanoparticles Using Ultrathin Ceramic Films |
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| Authors: | Luis F. Hakim Jarod A. McCormick Guo-Dong Zhan Alan W. Weimer Peng Li Steven M. George |
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| Affiliation: | Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131; Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309 |
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| Abstract: | Surface modification of titania nanoparticles was achieved by coating them with ultrathin alumina films using atomic layer deposition. The coating process was performed in a fluidized bed reactor at low pressure and under mechanical vibration. Films were deposited using self-limiting, sequential surface reactions of trimethylaluminum and water. The composition of alumina-coated particles was verified using infrared spectroscopy. The deposited films had an average growth rate of 0.2 nm/coating cycle and were highly uniform and conformal as demonstrated by transmission electron microscopy and X-ray spectroscopy. Deposited alumina films were amorphous as verified through X-ray diffraction and high-resolution electron microscopy. The coating process did not promote particle sintering as validated via particle size and surface area analysis. |
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