Fig. 5
From: Reversible fluorescent solid porous films for detection of zinc ions in biological media
Normalized absorption (A) and emission (B) spectra, excited at 492 nm, of mesoporous silica films prepared with the same thickness (350 nm) but with two different ZP1 concentrations: 2 mM and 67 µM. The highest fluorescence emission signal is observed in the films prepared with lower fluorophore concentration, in absence of Zn2+ ions