Figure 4From: Surface enhanced fluorescence of anti-tumoral drug emodin adsorbed on silver nanoparticles and loaded on porous siliconFluorescence spectra of the cross-section of a PSi layer of sample II(Em/Ag/H 2 O). Espectra are recorded on a point situated at 3 μm from Si-PSi interface. (a) After 30 days preparation, and (b) freshly prepared. Pore size is 60 nm. The Raman band of PSi at 503 cm−1 is marked with an asterisk.Back to article page