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The nanocrystals exhibited bands assigned to (Ce-Ti-O) and Ti-O near 544 cm−1 and 798 cm−1 that were from the longitudinal optical mode (LOM). The red pisnnhlaacinfyrtoeaoganfrsaitinhimngespTL2o7Oi–rO3t0ma.2nTcothodrneeotileonenfteitan.nmTspihothyreoposthoufocrtuhfaatse...
This would point to higher concentration of V(IV) species near the nanocrystal surface, where the oxygen defects are present, and largely influencing the XPS signal. Instead, after heating at 500 °C, only V(V) was observed in XPS spectra while carbon concentration was dramatically lowered....