Abstract
The surface of polyimide (PI) films before/after plasma surface treatment using a remote-type modified dielectric barrier discharge was investigated to improve the adhesion between the PI substrate and the metal thin film. Among the plasma treatments of the PI substrate surface using various gas mixtures, the surface treated with the plasma showed the lowest contact angle value due to the high bondings formed on the PI surface, while that treated with showed the highest contact angle value due to the high chemical bondings on the PI surface. Specifically, when the gas flow was varied from in the (x slm) gas composition, the lowest contact angle value of about 9.3° was obtained at an gas flow of . And it was due to the high content of oxygen radicals in the plasma, which leads to the formation of the highest bondings on the PI surface. When the interfacial adhesion strength between the Ag film and PI substrate was measured after the treatment with followed by the deposition of Ag, a peel strength of was observed, which is close to the adhesion strength between a metal and the PI treated by a low pressure plasma.
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