Lee, Kyung-Ryul Lee, Jong-Ho Yoo, Han-Ill 2024-01-20T11:31:00Z 2024-01-20T11:31:00Z 2021-09-05 2013-10 1463-9076 https://pubs.kist.re.kr/handle/201004/127580 Fully dense nanocrystalline ceria films were successfully deposited on a MgO single crystal by pulsed laser deposition (PLD). The electrical conductivity of the nanocrystalline thin film was 20 times higher than that of the bulk sample. The activation energy of bulk ceria was 2.3 eV, whereas the activation energy of the nanocrystalline sample was only 1.2 eV. After post-annealing at 1273 K in which the grain size of the nanocrystalline thin film increased to similar to 400 nm, the electrical conductivity and activation energy of the film were changed similar to those of bulk. These unique electrical properties of the nano-crystalline thin-film can be attributed to the grain size effect, or more specifically, to the space charge layer (SCL) effect. Furthermore, the electrical conductivity of the nanocrystalline thin film became similar to that of the bulk in an extremely reducing atmosphere because of the unusual dependence of the SCL effect on the oxygen partial pressure. English ROYAL SOC CHEMISTRY GRAIN-GROWTH CONDUCTIVITY Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films Article 10.1039/c3cp43625j 1 PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.37, pp.15632 - 15636 PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15 37 15632 15636 scie scopus 000323727800042 2-s2.0-84883247434 Chemistry, Physical Physics, Atomic, Molecular & Chemical Chemistry Physics Article GRAIN-GROWTH CONDUCTIVITY nanocrystalline SOFC ceria space charge layer