Unveiling the Nucleation and Coarsening Mechanisms of Solution-Derived Self-Assembled Epitaxial Ce0.9Gd0.1O2-y Nanostructures
Queraltó López, Albert (Institut de Ciència de Materials de Barcelona)
De La Mata, Maria (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Hühne, Ruben (Institute for Metallic Materials (Dresden, Alemanya))
Obradors, Xavier (Institut de Ciència de Materials de Barcelona)
Puig i Molina, Mª Teresa (Institut de Ciència de Materials de Barcelona)

Data:	2017
Resum:	Self-Assembling approaches based on chemical solution deposition (CSD) are ideal methods for the cost-effective production of epitaxial nanostructures with high throughput. Therefore, an in-depth investigation of the nucleation and coarsening processes involved in the self-Assembly of nanostructures is mandatory to achieve a good control over nanostructure shape, dimensions, and orientation. Heteroepitaxial CeGdO (CGO) is an ideal model system to unveil the underlying nanostructure development mechanisms in addition to their promising properties for catalysis, gas sensors, and ionic conductivity. Rapid thermal annealing furnaces have been used to study separately the thermodynamic and kinetic nucleation and coarsening mechanisms of self-Assembled CGO isotropic and anisotropic nanostructures based on strain-engineering and surface energies control. Different CGO nanoislands are obtained: isotropic (001)CGO nanodots are grown on (001)-oriented YO:ZrO(YSZ) and LaAlO (Lao) substrates, whereas (011)Lao substrates promote the growth of elongated (011)CGO nanowires. HRTEM and RHEED analyses are used to study the early stages of nucleation, as well as the shape and interfacial structure of CGO nanostructures. A systematic study with the heating ramp, annealing temperature and time, and strain in combination with thermally activated theoretical models provides information on the nucleation behavior, nucleation barriers, and atomic diffusion coefficients along in-plane and out-of-plane island orientations. Highly anisotropic atomic diffusion constants have been shown to be at the origin of the high aspect ratios of some of the nanostructures. Overall, our study provides a general method for the evaluation of nucleation and coarsening of multiple CSD-derived oxide nanostructures and understanding the shape development by combining thermodynamic and kinetic approaches.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad SEV-2015-0496 Ministerio de Economía y Competitividad MAT2015-68994-REDC Ministerio de Economía y Competitividad MAT2014-51778-C2-1-R Ministerio de Ciencia e Innovación MAT2011-28874-C02-01 Ministerio de Economía y Competitividad ENE2014-56109-C3-3-R Ministerio de Educación y Ciencia CSD2007-00041 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-753 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638
Nota:	Altres ajuts: CSIC i European Social Fund program for JAE-Predoc fellowships E-08-2012-1321248 i E-08-2013-1028356
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Anisotropic nanostructures ; Annealing temperatures ; Chemical solution deposition ; Cost-effective production ; Development mechanisms ; Epitaxial nanostructures ; Interfacial structures ; Self-assembly of nanostructures
Publicat a:	Crystal growth and design, Vol. 17, No 2 (February 2017) , p. 504-516, ISSN 1528-7483

DOI: 10.1021/acs.cgd.6b01358

Post-print 34 p, 1.8 MB

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