Figure 8.

a SEM image and b XRD pattern (JCPDS Card No. 34-394) of the as-prepared CeO2 hollow structure. c PL spectrum of CeO2 shell structure obtained under an ultraviolet excitation at 310 nm

Wu et al. Nanoscale Research Letters 2010 5:1779-1787   doi:10.1007/s11671-010-9711-1