Morphology and Surface Analysis of Pure and Doped Cuboidal Ceria Nanoparticles

Autor:	Thi X. T. Sayle, Tamilselvan Sakthivel, David L. Reid, Stephen C. Parker, Dean C. Sayle, Ian M. Ross, Sudipta Seal, Umananda M. Bhatta, Günter Möbus, Marco Molinari
Rok vydání:	2013
Předmět:	Materials science Electron energy loss spectroscopy Doping Nanoparticle Hydrothermal circulation Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Crystallography General Energy Octahedron Electron tomography Microscopy Physical and Theoretical Chemistry
Zdroj:	The Journal of Physical Chemistry C. 117:24561-24569
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp405993v
Popis:	Cuboidal nanoparticles of ceria are examined by high resolution imaging and analysis to explore their local morphology of faces, edges, and corners. Synthesized with and without Sm doping using a hydrothermal process, we find a high fraction of particles enclosed by {100} facets, which are normally energy-penalized compared to octahedral {111} facets. Electron tomography conducted at high magnification with lattice resolved imaging is combined with electron energy loss spectroscopy revealing oxidation states of Ce ions. It is found that extended {100} faces exist predominantly without local nanofaceting, except for {111} corner caps and subfacets on {110} edges. Reduced Ce is found on all {100} surfaces, while Sm doping does not lower the reduced Ce concentration. Molecular dynamics simulations are used to complement the microscopy, including the formation of {111} subfacets on {110} edges, formation of a {111} corner facet, and also the fact that reduced Ce ions prefer low coordinated positions like step...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c2e6a8fa6ddde7283a4c0d9b4aebd18a https://doi.org/10.1021/jp405993v Zobrazit plný text záznamu