Fig. 2

The top-down SEM images of P3HT nanograting film surface embossed from various patterned ETFE mold. a The top-down SEM image of P3HT film surface bearing nanograting of line width 150 nm, scale bar = 150 nm; b the top-down SEM image of P3HT film surface bearing nanograting of line width 250 nm, scale bar = 250 nm; c the top-down SEM image of P3HT film surface bearing nanograting of line width 700 nm, scale bar = 700 nm