@article{69d66e1ab3ec4568b93e2e72572df353,
title = "Surface Proton Conduction of Sm-Doped CeO2-δ Thin Film Preferentially Grown on Al2O3 (0001)",
abstract = "Sm-doped CeO2-δ (Ce0.9Sm0.1O2-δ; SDC) thin films were prepared on Al2O3 (0001) substrates by radio frequency magnetron sputtering. The prepared thin films were preferentially grown along the [111] direction, with the spacing of the (111) plane (d111) expanded by 2.6% to compensate for a lattice mismatch against the substrate. The wet-annealed SDC thin film, with the reduced d111 value, exhibited surface protonic conduction in the low-temperature region below 100 °C. The O1s photoemission spectrum exhibits H2O and OH− peaks on the SDC surface. These results indicate the presence of physisorbed water layers and the generation of protons on the SDC (111) surface with oxygen vacancies. The protons generated on the SDC surface were conducted through a physisorbed water layer by the Grotthuss mechanism.",
keywords = "Mixed valence state, O–H bond, Sm-doped CeO (SDC), Surface proton conduction, Thin film",
author = "D. Nishioka and T. Tsuchiya and W. Namiki and M. Takayanagi and K. Kawamura and T. Fujita and R. Yukawa and K. Horiba and H. Kumigashira and T. Higuchi",
note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (Grant No. 16H02115) from the Japan Society for the Promotion of Science and the MEXT Element Strategy Initiative to Form Core Research Center. The work at KEK was done under the approval of the Program Advisory Committee (Proposal Nos. 2018S2-004 and 2018G009) at the Institute of Materials Structure Science, KEK. Funding Information: This work was financially supported by a Grant-in-Aid for Scientific Research (Grant No. 16H02115) from the Japan Society for the Promotion of Science and the MEXT Element Strategy Initiative to Form Core Research Center. Funding Information: This work was supported by a Grant-in-Aid for Scientific Research (Grant No. 16H02115) from the Japan Society for the Promotion of Science and the MEXT Element Strategy Initiative to Form Core Research Center. The work at KEK was done under the approval of the Program Advisory Committee (Proposal Nos. 2018S2-004 and 2018G009) at the Institute of Materials Structure Science, KEK. Publisher Copyright: {\textcopyright} 2020, The Author(s).",
year = "2020",
doi = "10.1186/s11671-020-3267-5",
language = "English",
volume = "15",
journal = "Nanoscale Research Letters",
issn = "1931-7573",
publisher = "Springer New York",
number = "1",
}