title: Patterning Surfaces on Azo-Based Multilayer Films via Surface Wrinkling Combined with Visible Light Irradiation.
abstract: Here, a simple combined strategy of surface wrinkling with visible light irradiation to fabricate well tunable hierarchical surface patterns on azo-containing multilayer films is reported. The key to tailor surface patterns is to introduce a photosensitive poly(disperse orange 3) intermediate layer into the film/substrate wrinkling system, in which the modulus decrease is induced by the reversible photoisomerization. The existence of a photoinert top layer prevents the photoisomerization-induced stress release in the intermediate layer to some extent. Consequently, the as-formed wrinkling patterns can be modulated over a large area by light irradiation. Interestingly, in the case of selective exposure, the wrinkle wavelength in the exposed region decreases, while the wrinkles in the unexposed region are evolved into highly oriented wrinkles with the orientation perpendicular to the exposed/unexposed boundary. Compared with traditional single layer-based film/substrate systems, the multilayer system consisting of the photosensitive intermediate layer offers unprecedented advantages in the patterning controllability/universality. As demonstrated here, this simple and versatile strategy can be conveniently extended to functional multilayer systems for the creation of prescribed hierarchical surface patterns with optically tailored microstructures.
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Chuanyong
authors.initials: C
authors.lastname: Zong
authors.affiliation: AML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Haipeng
authors.initials: H
authors.lastname: Ji
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Jixun
authors.initials: J
authors.lastname: Xie
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Xue
authors.initials: X
authors.lastname: Han
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Wang
authors.affiliation: AML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Cao
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Conghua
authors.initials: C
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
authors.forename: Shichun
authors.initials: S
authors.lastname: Jiang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D008027:Light; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D055668:Photochemical Processes; D058105:Polymerization; D013499:Surface Properties
chemical_list: D001391:Azo Compounds; D008567:Membranes, Artificial; C041259:Disperse Orange 3
keywords: azo polymers; mechanical properties; photochemistry; surface patterns; wrinkling