Self-assembled Block Copolymer Non-volatile Structural Color through Thermal Cross-linking for Optical Data Storage
발표자
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초록
내용
Here, we demonstrate a self-assembled block copolymer (BCP) structural color (SC) that can be used for optical information storage. Our method is based on photo-thermal conversion, resulting in controlled cross-linking of the BCP’s microdomains. Exposure of near infrared (NIR) laser on a poly(styrene-block-quaternized poly(2-vinyl pyridine)) (PS-b-QP2VP) on a photo-thermal conversion layer, composed of poly (3,4-ehtylenedioxythiophene) doped with tosylate, allows photo-thermal cross-linking. The localized heat irradiating from the NIR-to-thermal conversion of the photo-thermal conversion layer is exerted on the BCP lamellae stacks, which results in thermal cross-linking between quaternized pyridines. Consequently, programmed SCs can be fabricated, which can be read with ethanol, a swelling agent. The degree of cross-linking of the QP2VP domains can be controlled with laser-power and exposure time, which gives data storing of SC per area, providing a non-volatile optical data storage.