Figure 4From: Submicron machining and biomolecule immobilization on porous silicon by electron beamSEM micrographs of four electron-irradiated regions (I, II, III, and IV) of a PS sample. Taken after 1-h exposure to distinct BSA solutions. The protein concentrations are indicated (black), as well the increase of the electron beam dose from 40 up to 100 mC/cm2 (white).Back to article page