Fig. 3. Characterization of the adsorption of DNA plasmid and streptavidin on functionalized mica. Streptavidin (160 nM) was added after DNA immobilization, DNA was incubated for 10 minutes prior to imaging and streptavidin was left to equilibrate for 10 minutes prior to imaging on (a) PLL1000–2000 only surface, (b) PLL10-b-PEG22 and (c) a mixed PLL10-b-PEG22/PLL1000–2000 surface. Colour scale (inset in c) 10 nm; scale bar 200 nm. Images taken in solution.
