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ORNL finding goes beyond surface of oxide films

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Posted August 14, 2013
ORNL finding goes beyond surface of oxide films

ORNL finding goes beyond surface of oxide films
This figure shows the spectroscopic measurement (current as a function of voltage) and this as a function of temperature. Reproduced by permission of The Royal Society of Chemistry

Better batteries, catalysts, electronic information storage and processing devices are among potential benefits of an unexpected discovery made by Oak Ridge National Laboratory scientists using samples isolated from the atmosphere.

Researchers at the Department of Energy lab learned that key surface properties of complex oxide films are unaffected by reduced levels of oxygen during fabrication – an unanticipated finding with possible implications for the design of functional complex oxides used in a variety of consumer products, said Zheng Gai, a member of DOE’s Center for Nanoscale Materials Sciences at ORNL.

The findings are detailed in a paper published in Nanoscale.

While the properties of the manganite material below the surface change as expected with the removal of oxygen, becoming an insulator rather than a metal, or conductor, researchers found that the sample showed remarkably stable electronic properties at the surface. Gai emphasized that the robustness of a surface matters because it is precisely the surface properties that determine, influence and affect the functionality of complex oxides in catalysis and batteries.

“With these materials being a promising alternative to silicon or graphene in electronic devices, the ever-decreasing size of such components makes their surface properties increasingly important to understand and control,” Gai said.

While this work provides a fundamental understanding of a material used and researched for catalysts, oxide electronics and batteries, Gai and lead author Paul Snijders noted that it’s difficult to speculate about possible impacts.

 

Read more at: Phys.org

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