Fig. 2. (a) PEN/Gr/Cu after lamination, (b) PEN/Gr after copper etching and rinsing. Optical microscope images of (c) sample 4 (100 °C, 20 bar), (d) sample 7 (115 °C, 20 bar), (e) sample 9 (115 °C, 45 bar), (f) sample 15 (125 °C, 45 bar).
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