Figure 4. a) Fluorescent image of NIH/3T3 cells after long-term cultured for 3 d on oxidized PPy nanoarray fi lm. b) Fluorescent image of reduced PPy nanoarray fi lm after detachment. c) SEM image of NIH/3T3 cells on oxidized PPy nanoarray fi lm after 3 d cultured. The top cell exhibited extreme stretching fi lopodia, and the bottom cells proliferated largely and then formed several cell layers. d) SEM image of NIH/3T3 residual cell after detached on reduced PPy nanoarray fi lm. Both top cell and bottom cell sheets were detached from substrate completely, leaving some residual cells.
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