Adsorption kinetics of alkanes on TiO2 nanotubesarray - structure-activity relationship |
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| Authors: | B Hokkanen U Burghaus A Ghicov |
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| Institution: | a Department of Chemistry, North Dakota State University, Fargo, USA
b University of Erlangen-Nuremberg, Department of Materials Science, Erlangen, Germany |
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| Abstract: | Presented are thermal desorption spectroscopy (TDS) measurements of iso-/n-butane adsorption on a variety of TiO2 nanotubes (TiNTs) samples which are characterized by different crystal structures. The results are compared with a prior study on anatase(0 0 1) thin films grown on SrTiO3(0 0 1). A distinct kinetic structure-activity relationship was present, i.e., the binding energies of the alkanes depend on the polymorph (anatase vs. mixed anatase/rutile) of TiO2. A direct-fitting procedure of the TDS data has been applied to extract the kinetics parameters. The binding energies in the limit of zero coverage decrease as anatase thin film > amorphous-TiNTs ∼ polycrystalline anatase TiNTs > polycrystalline mixed anatase/rutile TiNTs. |
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| Keywords: | Ultra-high vacuum surface chemistry Inorganic nanotubes TiO2 nanotubes Anatase Rutile Thermal desorption spectroscopy |
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