Interactions of H2O with SrTiO3(100) surfaces were investigated using temperature programmed desorption (TPD) spectroscopy. TPD spectra show that water desorbs below 300 K on stoichiometric TiO2-terminated SrTiO3(100) surfaces. TPD features at 200-300 K are attributed to the non-dissociative adsorption of H2O on cation sites while the TPD feature at 160 K is assigned to the desorption of multi-layer water. However, TPD spectra for H2O on reduced SrTiO3(100) surfaces exhibit additional desorption features at 300K-500K, resulted from dissociative adsorption of water. Comparisons of TPD spectra for H2O on SrTiO3(100) with unreconstructed TiO2(110) and (100) surfaces reveal a structural influence on the water adsorption and desorption behavior.
Revised: February 25, 2002 |
Published: February 1, 2002
Citation
Wang L.Q., K.F. Ferris, and G.S. Herman. 2002.Interactions of H2O with SrTiO3(100)Surfaces.Journal of Vacuum Science and Technology A--Vacuum, Surfaces and Films 20, no. 1:239-244.PNNL-SA-35393.