Surface modification on a polyimide film by pulsed ultraviolet (UV) laser irradiation with a fluence below its ablation threshold was studied by X‐ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and UV‐vis spectroscopy. It was observed that a photochemical reaction occurred and hydrophilic groups, such as —OH and —COOH, formed on the polyimide surface after irradiation. In addition, a ripple microstructure formed on the surface when the angle of incidence of the laser beam was 20–50o. The contact angle of the polyimide surface with water decreased and the adsorption ability of the surface to a water‐soluble dye clearly increased after laser irradiation.
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Lu et al. (2001) studied this question.
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