Abstract
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 steps and corners along with more active {100} faces.
| Language | English |
|---|---|
| Pages | 24561-24569 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry C |
| Volume | 117 |
| Issue number | 46 |
| DOIs | |
| Publication status | Published - 21 Nov 2013 |
| Externally published | Yes |
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Morphology and surface analysis of pure and doped cuboidal ceria nanoparticles. / Bhatta, Umananda M.; Reid, David; Sakthivel, Tamilselvan; Sayle, Thi X.T.; Sayle, Dean; Molinari, Marco; Parker, Stephen C.; Ross, Ian M.; Seal, Sudipta; Möbus, Günter.
In: Journal of Physical Chemistry C, Vol. 117, No. 46, 21.11.2013, p. 24561-24569.Research output: Contribution to journal › Article
TY - JOUR
T1 - Morphology and surface analysis of pure and doped cuboidal ceria nanoparticles
AU - Bhatta, Umananda M.
AU - Reid, David
AU - Sakthivel, Tamilselvan
AU - Sayle, Thi X.T.
AU - Sayle, Dean
AU - Molinari, Marco
AU - Parker, Stephen C.
AU - Ross, Ian M.
AU - Seal, Sudipta
AU - Möbus, Günter
PY - 2013/11/21
Y1 - 2013/11/21
N2 - 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 steps and corners along with more active {100} faces.
AB - 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 steps and corners along with more active {100} faces.
UR - http://www.scopus.com/inward/record.url?scp=84888623266&partnerID=8YFLogxK
U2 - 10.1021/jp405993v
DO - 10.1021/jp405993v
M3 - Article
VL - 117
SP - 24561
EP - 24569
JO - Journal of Physical Chemistry C
T2 - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 46
ER -