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Nonvolatile, Multicolored Photothermal Writing of Block Copolymer Structural Color

Title
Nonvolatile, Multicolored Photothermal Writing of Block Copolymer Structural Color
Author
강영종
Keywords
multilevel information storage; nonvolatile photothermal writing; self-assembled block copolymers; structural colors; thermally induced crosslinking
Issue Date
2019-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v. 29, no. 42, article no. 1904055
Abstract
In spite of efforts to fabricate stimuli-sensitive structural colors (SCs) of self-assembled block copolymer (BCP) photonic crystals (PCs) with potential applications in displays, media boards, and sensors, few studies have demonstrated BCP PCs suitable for high-density nonvolatile information storage. Herein, a simple but robust route for multilevel nonvolatile information recording using a BCP PC is presented. The proposed method is based on the spatially controlled crosslinking of microdomains of a BCP PC induced by photothermal conversion. Photothermal SC writing is accomplished via time- and position-controlled laser exposure on thin poly(styrene-block-quaternized 2-vinyl pyridine) (PS-b-QP2VP) PC films deposited on a layer of poly(3,4-ethylenedioxythiophene) doped with tosylate (PP-PEDOT). Upon near-infrared (NIR) irradiation of this structure, the PP-PEDOT underlayer converts the NIR light into thermal energy in the locally irradiated region, which is subsequently transferred to the BCP top layer consisting of alternating in-plane PS and QP2VP lamellar stacks. The QP2VP layers are vulnerable to thermal crosslinking, giving rise to locally programmable SCs. The degree of crosslinking of the QP2VP domains depends on the laser power and exposure time, which allows for multi-SC recording per spot, leading to a novel multilevel optical recording medium based on BCP PCs.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201904055https://repository.hanyang.ac.kr/handle/20.500.11754/152211
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.201904055
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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