Figure 4.

(a) Optical micrograph of latex particles assembled at pH 4.5 onto an NVoc silane monolayer after photodeprotection with an argon laser (364 nm) through a gold mask on quartz (dark squares were protected from light). (b) Particle assembly (pH 4.5) on a mixed monolayer of the NVoc and ammonium silane after irradiation (similar to a). Bright squares were protected from light and show a lower particle density in the SEM. (c) Fluorescence micrograph of a mixed monolayer (NVoc and ammonium silane, similar to b) after irradiation and staining with a fluorescent probe (Alexa Fluor 488).