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Proton conductivity of columnar ceria thin-films grown by chemical vapor deposition

Oh, Tae-Sik and Boyd, David A. and Goodwin, David G. and Haile, Sossina M. (2012) Proton conductivity of columnar ceria thin-films grown by chemical vapor deposition. Physical Chemistry Chemical Physics, 15 (7). pp. 2466-2472. ISSN 1463-9076.

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Columnar thin films of undoped ceria were grown by metal–organic chemical vapor deposition. The films, deposited on Pt-coated MgO(100) substrates, display a columnar microstructure with nanometer scale grain size and ~30% overall porosity. Through-plane (thickness mode) electrical conductivity was measured by AC impedance spectroscopy. Proton conduction is observed below 350–400 °C, with a magnitude that depends on gas-phase water vapor pressure. The overall behavior suggests proton transport that occurs along exposed grain surfaces and parallel grain boundaries. No impedance due to grain boundaries normal to the direction of transport is observed. The proton conductivity in the temperature range of 200–400 °C is approximately four times greater than that of nanograined bulk ceria, consistent with enhanced transport along aligned grain surfaces in the CVD films.

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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2013 Royal Society of Chemistry. First published on the web 03 Dec 2012. The authors gratefully acknowledge financial support from the National Science Foundation under Grant No. CBET-1038307. Dr. Yong Hao carried out all Pt depositions. Prof. Harry Atwater kindly provided access to DC magnetron sputtering instrumentation.
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Issue or Number:7
Record Number:CaltechAUTHORS:20130221-102455104
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37052
Deposited By: Jason Perez
Deposited On:21 Feb 2013 21:53
Last Modified:03 Oct 2019 04:44

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