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Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Title
Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films
Authors
Lee, ShinbuhmMacManus-Driscoll, Judith L.
DGIST Authors
Lee, Shinbuhm
Issue Date
2017-04
Citation
Apl Materials, 5(4)
Type
Article
Article Type
Article
Keywords
Colossal Ionic ConductivityDOPED CeO2Epitaxial ZrO2Y2O3/SrTio3 HeterostructuresFuel CellsInterfacesNanocomposite Thin FilmsRechargeable Lithium BatteriesStrain ControlTransition Metal OxidesTransport
ISSN
2166-532X
Abstract
This review provides the design principles to develop new nanoionic applications using vertically aligned nanostructured (VAN) thin films, incorporating two phases which self-assemble in one film. Tunable nanoionics has attracted great attention for energy and device applications, such as ion batteries, solid oxide fuel cells, catalysts, memories, and neuromorphic devices. Among many proposed device architectures, VAN films have strong potential for nanoionic applications since they show enhanced ionic conductivity and tunability. Here, we will review the recent progress on state-of- the-art nanoionic applications, which have been realized by using VAN films. In many VAN systems made by the inclusion of an oxygen ionic insulator, it is found that ions flow through the vertical heterointerfaces. The observation is consistent with structural incompatibility at the vertical heteroepitaxial interfaces resulting in oxygen deficiency in one of the phases and hence to oxygen ion conducting pathways. In other VAN systems where one of the phases is an ionic conductor, ions flow much faster within the ionic conducting phase than within the corresponding plain film. The improved ionic conduction coincides with much improved crystallinity in the ionically conducting nanocolumnar phase, induced by use of the VAN structure. Furthermore, for both cases Joule heating effects induced by localized ionic current flow also play a role for enhanced ionic conductivity. Nanocolumn stoichiometry and strain are other important parameters for tuning ionic conductivity in VAN films. Finally, double-layered VAN film architectures are discussed from the perspective of stabilizing VAN structures which would be less stable and hence less perfect when grown on standard substrates. (C) 2017 Author(s).
URI
http://hdl.handle.net/20.500.11750/4207
DOI
10.1063/1.4978550
Publisher
AMER INST PHYSICS
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles
Emerging Materials ScienceETC1. Journal Articles


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