| abstract |
(57) [Problem] To provide a direct patterning method. SOLUTION: The surface of a resin substrate is subjected to an ion exchange group introduction treatment, the surface of the resin substrate is treated with a metal ion-containing liquid to introduce metal ions, and a photocatalyst is introduced into the resin substrate into which the metal ions have been introduced. And a composite material having a metal on the surface of the resin substrate, which is obtained by irradiating the resin substrate with the photocatalyst with electromagnetic radiation. The composite material is useful as a composite material requiring a finer metal pattern. |