A modulated coherent (La,Sr)CoO3-/(Ce,Gd)O2- heterostructure is characterized for the first time for its electronic and chemical properties. 2D-multilayer architectures are deposited on NdGaO3 (110) single crystal substrate by pulsed laser deposition, resulting in epitaxial structures with in-plane lattice rotation that, via the metal oxides' interfaces, induces mutual structural rearrangements. Our results show that (La,Sr)CoO3-d thin films of 10-100 nm are chemically unstable when exposed to air at 600 degrees C during electrical cyclic stress-tests. Conversely, improved stability is achieved confining LSC in the nanometric heterostructure. Remarkably, the chemical stabilization occurs without compromising substantially the electrical properties of the LSC component: the heterostructures show unexpected electrical behaviour with dominant electronic contributions, fast conductivity and mixed ionic-electronic properties, depending on the number of interfaces and the nano-scaled layers.
Dos Santos-Gomez, L., Sanna, S., Norby, P., Pryds, N., Losilla, E.r., Marrero-Lopez, D., et al. (2019). Electrochemical stability of (La,Sr)CoO 3-δ in (La,Sr)CoO 3-δ /(Ce, Gd)O 2-delta; Heterostructures. NANOSCALE, 11(6), 2916-2924 [10.1039/c8nr08528e].
Electrochemical stability of (La,Sr)CoO 3-δ in (La,Sr)CoO 3-δ /(Ce, Gd)O 2-delta; Heterostructures
Sanna S.;
2019-01-01
Abstract
A modulated coherent (La,Sr)CoO3-/(Ce,Gd)O2- heterostructure is characterized for the first time for its electronic and chemical properties. 2D-multilayer architectures are deposited on NdGaO3 (110) single crystal substrate by pulsed laser deposition, resulting in epitaxial structures with in-plane lattice rotation that, via the metal oxides' interfaces, induces mutual structural rearrangements. Our results show that (La,Sr)CoO3-d thin films of 10-100 nm are chemically unstable when exposed to air at 600 degrees C during electrical cyclic stress-tests. Conversely, improved stability is achieved confining LSC in the nanometric heterostructure. Remarkably, the chemical stabilization occurs without compromising substantially the electrical properties of the LSC component: the heterostructures show unexpected electrical behaviour with dominant electronic contributions, fast conductivity and mixed ionic-electronic properties, depending on the number of interfaces and the nano-scaled layers.File | Dimensione | Formato | |
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