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Abstract
Branched nanocrystals (NCs) enable high atomic surface exposure within a crystalline network that provides avenues for charge transport. This combination of properties makes branched NCs particularly suitable for a range of applications where both interaction with the media and charge transport are involved. Herein we report on the colloidal synthesis of branched ceria NCs by means of a ligand-mediated overgrowth mechanism. In particular, the differential coverage of oleic acid as an X-type ligand at ceria facets with different atomic density, atomic coordination deficiency, and oxygen vacancy density resulted in a preferential growth in the [111] direction and thus in the formation of ceria octapods. Alcohols, through an esterification alcoholysis reaction, promoted faster growth rates that translated into nanostructures with higher geometrical complexity, increasing the branch aspect ratio and triggering the formation of side branches. On the other hand, the presence of water resulted in a significant reduction of the growth rate, decreasing the reaction yield and eliminating side branching, which we associate to a blocking of the surface reaction sites or a displacement of the alcoholysis reaction. Overall, adjusting the amounts of each chemical, well-defined branched ceria NCs with tuned number, thickness, and length of branches and with overall size ranging from 5 to 45 nm could be produced. We further demonstrate that such branched ceria NCs are able to provide higher surface areas and related oxygen storage capacities (OSC) than quasi-spherical NCs.
Keywords
COLLOIDAL NANOCRYSTALS, OXIDE NANOPARTICLES, CEO2 NANOCRYSTALS, CATALYTIC-PROPERTIES, SIZED CERIA, SURFACE, SHAPE, OXIDATION, SENSITIVITY, WATER

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Citation

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MLA
Berestok, Taisiia, et al. “Tuning Branching in Ceria Nanocrystals.” CHEMISTRY OF MATERIALS, vol. 29, no. 10, 2017, pp. 4418–24, doi:10.1021/acs.chemmater.7b00896.
APA
Berestok, T., Guardia, P., Blanco, J., Nafria, R., Torruella, P., Lopez-Conesa, L., … Cabot, A. (2017). Tuning branching in ceria nanocrystals. CHEMISTRY OF MATERIALS, 29(10), 4418–4424. https://doi.org/10.1021/acs.chemmater.7b00896
Chicago author-date
Berestok, Taisiia, Pablo Guardia, Javier Blanco, Raquel Nafria, Pau Torruella, Luis Lopez-Conesa, Sonia Estrade, et al. 2017. “Tuning Branching in Ceria Nanocrystals.” CHEMISTRY OF MATERIALS 29 (10): 4418–24. https://doi.org/10.1021/acs.chemmater.7b00896.
Chicago author-date (all authors)
Berestok, Taisiia, Pablo Guardia, Javier Blanco, Raquel Nafria, Pau Torruella, Luis Lopez-Conesa, Sonia Estrade, Maria Ibáñez, Jonathan De Roo, Zhishan Luo, Doris Cadavid, José Martins, Maksym V Kovalenko, Francesca Peiró, and Andreu Cabot. 2017. “Tuning Branching in Ceria Nanocrystals.” CHEMISTRY OF MATERIALS 29 (10): 4418–4424. doi:10.1021/acs.chemmater.7b00896.
Vancouver
1.
Berestok T, Guardia P, Blanco J, Nafria R, Torruella P, Lopez-Conesa L, et al. Tuning branching in ceria nanocrystals. CHEMISTRY OF MATERIALS. 2017;29(10):4418–24.
IEEE
[1]
T. Berestok et al., “Tuning branching in ceria nanocrystals,” CHEMISTRY OF MATERIALS, vol. 29, no. 10, pp. 4418–4424, 2017.
@article{8519090,
  abstract     = {{Branched nanocrystals (NCs) enable high atomic surface exposure within a crystalline network that provides avenues for charge transport. This combination of properties makes branched NCs particularly suitable for a range of applications where both interaction with the media and charge transport are involved. Herein we report on the colloidal synthesis of branched ceria NCs by means of a ligand-mediated overgrowth mechanism. In particular, the differential coverage of oleic acid as an X-type ligand at ceria facets with different atomic density, atomic coordination deficiency, and oxygen vacancy density resulted in a preferential growth in the [111] direction and thus in the formation of ceria octapods. Alcohols, through an esterification alcoholysis reaction, promoted faster growth rates that translated into nanostructures with higher geometrical complexity, increasing the branch aspect ratio and triggering the formation of side branches. On the other hand, the presence of water resulted in a significant reduction of the growth rate, decreasing the reaction yield and eliminating side branching, which we associate to a blocking of the surface reaction sites or a displacement of the alcoholysis reaction. Overall, adjusting the amounts of each chemical, well-defined branched ceria NCs with tuned number, thickness, and length of branches and with overall size ranging from 5 to 45 nm could be produced. We further demonstrate that such branched ceria NCs are able to provide higher surface areas and related oxygen storage capacities (OSC) than quasi-spherical NCs.}},
  author       = {{Berestok, Taisiia and Guardia, Pablo and Blanco, Javier and Nafria, Raquel and Torruella, Pau and Lopez-Conesa, Luis and Estrade, Sonia and Ibáñez, Maria and De Roo, Jonathan and Luo, Zhishan and Cadavid, Doris and Martins, José and Kovalenko, Maksym V and Peiró, Francesca and Cabot, Andreu}},
  issn         = {{0897-4756}},
  journal      = {{CHEMISTRY OF MATERIALS}},
  keywords     = {{COLLOIDAL NANOCRYSTALS,OXIDE NANOPARTICLES,CEO2 NANOCRYSTALS,CATALYTIC-PROPERTIES,SIZED CERIA,SURFACE,SHAPE,OXIDATION,SENSITIVITY,WATER}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{4418--4424}},
  title        = {{Tuning branching in ceria nanocrystals}},
  url          = {{http://doi.org/10.1021/acs.chemmater.7b00896}},
  volume       = {{29}},
  year         = {{2017}},
}

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