Tuning the size and shape of colloidal cerium oxide nanocrystals through lanthanide dopingElectronic supplementary information (ESI) available: Experimental and instrumental details, FT-IR spectra of pure CeO2nanoparticles, XRD patterns of CeO2nanocrystals doped with Yb3+or Gd3+ions of 0, 4, 7, 12, 22 mol%, histogram of size distribution of CeO2nanocrystals doped with Yb3+or Gd3+ions of 0, 4, 7, 12, 22 mol%; more TEM images. Energy dispersive spectroscopy and inductively coupled plasma mass spectrometry of CeO2nanocrystals doped with Yb3+or Gd3+ions of 0, 4, 7, 12, 22 mol%, upconversion PL spectra and photographic images of CeO2nanocrystals doped with Er3+ions of 2 mol% and Yb3+ions of 0, 4, 7, 12, 22 mol%. See DOI: 10.1039/c1cc13707g

We present a simple method to gradually tune the size and to induce the shape change of CeO2nanoparticles viaincreasing the content of Yb3+doping. [ABSTRACT FROM AUTHOR]