Jump to main content
Jump to site search

Issue 37, 2013
Previous Article Next Article

Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films

Author affiliations

Abstract

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 ∼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.

Graphical abstract: Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films

Back to tab navigation

Supplementary files

Article information


Submitted
13 Oct 2012
Accepted
17 Jul 2013
First published
19 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 15632-15636
Article type
Paper

Experimental evidence of tunable space-charge-layer-induced electrical properties of nanocrystalline ceria thin films

K. Lee, J. Lee and H. Yoo, Phys. Chem. Chem. Phys., 2013, 15, 15632
DOI: 10.1039/C3CP43625J

Social activity

Search articles by author

Spotlight

Advertisements