Ahn, Junsung Jang, Ho Won Ji, Hoil Kim, Hyoungchul Yoon, Kyung Joong Son, Ji-Won Kim, Byung-Kook Lee, Hae-Weon Lee, Jong-Ho 2024-01-19T23:00:39Z 2024-01-19T23:00:39Z 2021-09-03 2018-05 1530-6984 https://pubs.kist.re.kr/handle/201004/121421 Strain-induced fast ion conduction has been a research area of interest for nanoscale energy conversion and storage systems. However, because of significant discrepancies in the interpretation of strain effects, there remains a lack of understanding of how fast ionic transport can be achieved by strain effects and how strain can be controlled in a nanoscale system. In this study, we investigated strain effects on the ionic conductivity of Gd0.2Ce0.8O1.9-delta (100) thin films under well controlled experimental conditions, in which errors due to the external environment could not intervene during the conductivity measurement. In order to avoid any interference from perpendicular-to-surface defects, such as grain boundaries, the ionic conductivity was measured in the out-of-plane direction by electrochemical impedance spectroscopy analysis. With varying film thickness, we found that a thicker film has a lower activation energy of ionic conduction. In addition, careful strain analysis using both reciprocal space mapping and strain mapping in transmission electron microscopy shows that a thicker film has a higher tensile strain than a thinner film. Furthermore, the tensile strain of thicker film was mostly developed near a grain boundary, which indicates that intrinsic strain is dominant rather than epitaxial or thermal strain during thin-film deposition and growth via the Volmer-Weber (island) growth mode. English AMER CHEMICAL SOC OXIDE FUEL-CELLS DOPED CERIA ELECTROCHEMICAL PROPERTIES NANOCRYSTALLINE CERIA ELECTRICAL-PROPERTIES TRANSPORT-PROPERTIES SOLID ELECTROLYTES THERMAL-EXPANSION OXYGEN DIFFUSION LATTICE-STRAIN Identification of an Actual Strain-Induced Effect on Fast Ion Conduction in a Thin-Film Electrolyte Article 10.1021/acs.nanolett.7b04952 1 NANO LETTERS, v.18, no.5, pp.2794 - 2801 NANO LETTERS 18 5 2794 2801 scie scopus 000432093200008 2-s2.0-85046622303 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article OXIDE FUEL-CELLS DOPED CERIA ELECTROCHEMICAL PROPERTIES NANOCRYSTALLINE CERIA ELECTRICAL-PROPERTIES TRANSPORT-PROPERTIES SOLID ELECTROLYTES THERMAL-EXPANSION OXYGEN DIFFUSION LATTICE-STRAIN Gadolinium-doped ceria strain effect ionic conductivity Volmer-Weber growth intrinsic strain reciprocal space mapping