Figure 4.
AFM images (scan size = 10×10 μm2) of [rPDMAEMA/DNA]15 LbL film (a) before cross-linking reaction (Z-range = 220 nm and Rq = 30 nm), (b) after cross-linking reaction (Z-range = 180 nm and Rq = 18 nm, and (c) before cross-linking but immersed in hexane at 50–55 °C for 1 h (Z-range = 220 nm and Rq = 33 nm). Reference bar is 2 μm.