Figure 1.

a,bSEM images of Eu-doped TiO2nanodots on silicon substrates after calcining at 500 °C andc,dthe corresponding size distribution histograms (a,c: nanodot-1;b,d: nanodot-2)

Luo et al. Nanoscale Research Letters 2009 4:809-813   doi:10.1007/s11671-009-9319-5