Fig. 3: X-ray photoelectron spectroscopy data from a 180 °C-grown polymer sample (black) and after annealing to 400 °C (red), with individual elemental spectra shown in inset.

The peaks corresponding to fluorine and the C[C2F] moiety are present after the initial polymer growth but disappear following cyclodehydrogenation. The entire 400 °C spectrum was offset vertically from the as-grown sample data for enhanced visual clarity.