2 research outputs found
Dumbbell-like Au<sub>0.5</sub>Cu<sub>0.5</sub>@Fe<sub>3</sub>O<sub>4</sub> Nanocrystals: Synthesis, Characterization, and Catalytic Activity in CO Oxidation
No full textWe
report the colloidal synthesis of dumbbell-like Au<sub>0.5</sub>Cu<sub>0.5</sub>@Fe<sub>3</sub>O<sub>4</sub> nanocrystals (AuCu@FeOx NCs)
and the study of their properties in the CO oxidation reaction. To
this aim, the as-prepared NCs were deposited on γ-alumina and
pretreated in an oxidizing environment to remove the organic ligands.
A comparison of these NCs with bulk Fe<sub>3</sub>O<sub>4</sub>-supported
AuCu NCs showed that the nanosized support was far more effective
in preventing the sintering of the metal domains, leading thus to
a superior catalytic activity. Nanosizing of the support could be
thus an effective, general strategy to improve the thermal stability
of metallic NCs. On the other hand, the support size did not affect
the chemical transformations experienced by the AuCu NCs during the
activation step. Independently from the support size, we observed
indeed the segregation of Cu from the alloy phase under oxidative
conditions as well as the possible incorporation of the Cu atoms in
the iron oxide domain
Dumbbell-like Au<sub>0.5</sub>Cu<sub>0.5</sub>@Fe<sub>3</sub>O<sub>4</sub> Nanocrystals: Synthesis, Characterization, and Catalytic Activity in CO Oxidation
No full textWe
report the colloidal synthesis of dumbbell-like Au<sub>0.5</sub>Cu<sub>0.5</sub>@Fe<sub>3</sub>O<sub>4</sub> nanocrystals (AuCu@FeOx NCs)
and the study of their properties in the CO oxidation reaction. To
this aim, the as-prepared NCs were deposited on γ-alumina and
pretreated in an oxidizing environment to remove the organic ligands.
A comparison of these NCs with bulk Fe<sub>3</sub>O<sub>4</sub>-supported
AuCu NCs showed that the nanosized support was far more effective
in preventing the sintering of the metal domains, leading thus to
a superior catalytic activity. Nanosizing of the support could be
thus an effective, general strategy to improve the thermal stability
of metallic NCs. On the other hand, the support size did not affect
the chemical transformations experienced by the AuCu NCs during the
activation step. Independently from the support size, we observed
indeed the segregation of Cu from the alloy phase under oxidative
conditions as well as the possible incorporation of the Cu atoms in
the iron oxide domain
