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Orientation symmetry breaking in self-assembled Ce1- : XGdxO2- y nanowires derived from chemical solutions
Queraltó López, Albert (Institut de Ciència de Materials de Barcelona)
De La Mata, Maria (Institut Català de Nanociència i Nanotecnologia)
Martínez, Lidia (Instituto de Ciencia de Materiales de Madrid)
Magén, César (Universidad de Zaragoza. Instituto de Nanociencia de Aragón)
Gibert, Marta (Université de Genève. Département de Physique de la Matière Quantique)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Hühne, Ruben (Institut für Metallische Werkstoffe)
Obradors, Xavier (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC))
Puig i Molina, Mª Teresa (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC))

Date: 2016
Abstract: Understanding the growth mechanisms of nanostructures obtained from chemical solutions, a high-throughput production methodology, is essential to correlate precisely the growth conditions with the nanostructures' morphology, dimensions and orientation. It is shown that self-organized (011)-oriented Ce₀. ₉Gd₀. ₁O₂ᵧ (CGO) nanowires having a single in-plane orientation are achieved when an anisotropic (011)-LaAlO₃ (LAO) substrate is chosen. STEM and AFM images of the epitaxial nanowires reveal the (001)CGO[0-11](011)LAO[100] growth orientation, with the enlargement occurring along the [0-11]CGO direction with (111) lateral facets. The chosen substrate allowed us to study a unique case where the resulting biaxial strain is isotropic, while the dissimilar lateral surface energies are the key factor to obtain an energetically imbalanced and non-degenerated nanowire configuration. Rapid Thermal Annealing (RTA) has allowed sorting of experimental nucleation from coarsening and analysis of the kinetic phenomena of the nanowires. A thermodynamic driving force is shown to exist for a continuous elongation of the nanowires while the coarsening rates are found to be strongly temperature dependent and so kinetic effects are the key factors to control the size and density of the self-organized nanowire system. A remarkably fast nanowire growth rate (14-40 nm min⁻¹) is observed, which we associate with a high atomic mobility probably linked to a high concentration of oxygen vacancies, as detected by XPS. These nanowires are envisaged as model systems pushing forward the study of low energetic and highly oxygen deficient {111} lateral facets useful for catalysis, gas sensors and ionic conductivity applications.
Note: Número d'acord de subvenció MINECO/SEV-2015-0496
Note: Número d'acord de subvenció MINECO/MAT2015-68994-REDC
Note: Número d'acord de subvenció MINECO/MAT2014-51778-C2-1-R
Note: Número d'acord de subvenció MINECO/ENE2014-56109-C3-3-R
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció MINECO/MAT2011-28874-C02-01
Note: Número d'acord de subvenció MINECO/CSD2007-00041
Note: Número d'acord de subvenció AGAUR/2014/SGR-1638
Note: Número d'acord de subvenció AGAUR/2014/SGR-753
Rights: Tots els drets reservats.
Language: Anglès
Document: article ; recerca ; acceptedVersion
Subject: Chemical solutions ; Growth mechanisms ; Growth orientations ; In-plane orientation ; Rapid thermal annealing (RTA) ; Symmetry-breaking ; Temperature dependent ; Thermodynamic driving forces
Published in: RSC advances, Vol. 6, issue 99 (2016) , p. 97226-97236, ISSN 2046-2069

DOI: 10.1039/c6ra23717g


Postprint
12 p, 1.9 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2019-01-14, last modified 2020-08-08



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