Figure 3From: Surface enhanced fluorescence of anti-tumoral drug emodin adsorbed on silver nanoparticles and loaded on porous siliconRaman spectra of the cross-section of a PSi layer at different positions. (a) PSi-air interface, (b) PSi, 3 μm from Si-PSi interface, (c) Si-PSi interface, and (d) Si. Pore size is 60 nm.Back to article page