Flexible microfiber array film possessing light-activated conductive anisotropy

Flexible anisotropic conductive films with light-activated conductive anisotropy are proposed and fabricated. The films consist of ordered polymer microfibers doped with photoconductive beta-type copper phthalocyanine (II) (Cu-Pc) and are prepared by electrospinning technique. Under dark condition, the films are omnidirectionally insulative. Under light irradiation, electrically conductive anisotropy of the films is activated. The light resistance along length direction of the microfibers is 3 orders of magnitude lower than dark resistance, while the light resistance along the length direction of the microfibers is 2 orders of magnitude lower than that along the orthogonal direction on the surface of the film. The impacts of the ratio of doped Cu-Pc, PMMA and PEO on properties of the films are investigated. The novel light-activated anisotropic conductive films hold extensive prospects in the field of flexible electronics.