| 초록 |
Photonic crystals were fabricated using self-assembly of high-molecular-weight (high-Mw) block copolymers (BCPs). Unique solvatochromism-dependent red- and blue-shift reflective bands could be acquired in the BCP gel films using a neutral solvent as a stimulus. At low polymer concentration, red-shift of the reflectivity was attributed to the increase of BCP long period by the enhancement of the BCP segregation strength. In contrast, at high polymer concentration, the blue-shifting reflectivity resulted from the decrease of the BCP long period by the collapse of polymer chains. Also, the as-spun high-Mw BCP thin films from extremely low-vapor-pressure solvents displayed highly-oriented parallel lamellar microstructures, giving the rapid fabrication of large-area photonic thin films. Taking advantage of the photo-induced crosslinking characteristics of the constituted blocks toward UV irradiation, a well-defined photopatterned thin film photonic crystal was carried via masking. |
