Engineering of the band gap induced by Ce surface enrichment in Ce-doped SnO2 nanocrystals

Optimizing the Microstructure of SnO2–CeO2 Binary Oxide Supported Palladium Catalysts for Efficient and Stable Methane Combustion

“…However, those attributed to palladium species were absent, which was associated with the low loading content, small particle size, or high dispersion of palladium species . The phase structure of catalysts was also verified by the Raman spectra (Figure S2), in view of the presence of bands ascribed to the SnO 2 A 1g (633 cm –1 ) and CeO 2 F 2g (463 cm –1 ) vibration modes and the absence of bands assigned to the PdO B 1g mode (650 cm –1 ) . The band of CeO 2 F 2g mode over catalysts shifted and broadened, indicating a lowered symmetry of the crystal lattice after Pd loading.…”

Tuning the magnetic properties of Sn1−x−yCe4+xCe3+yO2 nanoparticles: an experimental and theoretical approach

“…The latter, are electrons trapped in oxygen vacancies, likewise, the strengthening of the ferromagnetism is linked to the amount of V 0 which is in agreement with the PL results associated to V 0 in the same samples. 37 Furthermore, above the 1 mol% concentration the magnetic saturation shows a monotonic decrease of up to 10 mol%, which is associated with the reduction of the Fcenters due to an enrichment of the surface segregation and the change of oxidized state from Ce 3+ to Ce 4+ aer increasing the doping content. The latter is produced during the synthesis process, where the amount of Ce 3+ (x) and Ce 4+ (y) in the SnO 2 host matrix, and Ce 4+ (z) in the CeO 2 secondary phase depends on the Ce content according to the following equation,…”

“…This drives the decrease of oxygen vacancies, reducing the presence of the neighboring oxygen vacancies around the cerium ions, in agreement with previous work, where they have shown that this occurs mainly on the particle shell. 31,37 Fig. 10 The local density of states (LDOS) for Sn Here, we calculated the formation energy E f with the following expression: 45 is the lowest E f , suggesting the most probable defect to occur in our experimental measurements.…”

Interconnected effects of Sm-doping on grain structure and transport properties of the textured Bi2-Sm Te2.7Se0.3 compounds

“…The Ostwald ripening model is often applied to describe a growth of particles in various solutions [56,57]. In accordance with this model, a change in particle size with spherical shape can be expressed as…”

“…Since with increasing x in the Bi 2-x Sm x Te 3 compounds, c ∞ can be decreasing through increasing in the ionic boding fraction, size of the Bi 2-x Sm x Te 3 particles will be reducing, too. To analyse a growth of Cedoped SnO 2 nanocrystals synthesized by Pechini's method, expression (4) was earlier modified as follows [57].…”