The surface energy (𝛾 𝑠 ) of each film was calculated using the Fowkes model, by carrying out contact angle (θ) measurements using water and diiodomethane. Utilizing the latter solvent, which exhibits negligible dispersive contribution to its surface tension (𝛾 𝑠 𝑑 ), allows determination of the polar (𝛾 𝑠 𝑝 ) and dispersive (𝛾 𝑠 𝑑 ) surface energy components. With increased UVO exposure, improved wetting of the film surface was observed through a large decrease in the water contact angle and an increase in total surface energy as shown in Figure . Upon extracting the separate dispersive and polar contributions (Supplementary Table ), the increase in total surface energy was determined to be largely influenced by the latter. To gain insights into the contributions to the increase in surface energy, the chemical composition of the polymer surface after UVO exposure was studied using X-ray photoelectron spectroscopy (XPS).