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Monodispersed CeO 2 nanocubes were prepared by using a liquid−liquid interface. The morphology of CeO 2 nanocrystals from the aqueous phase changed from truncated octahedron to nanocube in the toluene phase at the water−toluene interface. The CeO 2 nanocubes oriented to form large cubic particles at a low molar ratio of oleic acid (OLA)/Ce. The red-shift of the absorption edge and the high concentration of Ce 3+ in the CeO 2 structure was identified for the CeO 2 nanocrystals. The high concentration of Ce 3+ in the CeO 2 structure was identified as one of the main reasons for the red-shift of the absorption edge of CeO 2 nanocrystals.
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Dang et al. (2010) studied this question.
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