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Nonvolatile, Multicolored Photothermal Writing of Block Copolymer Structural Color
Author(s) -
Eoh Hongkyu,
Kang Han Sol,
Kim Min Ju,
Koo Min,
Park Tae Hyun,
Kim Yeongsik,
Lim Hanwhuy,
Ryu Du Yeol,
Kim Eunkyoung,
Huh June,
Kang Youngjong,
Park Cheolmin
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201904055
Subject(s) - materials science , photothermal effect , photothermal therapy , copolymer , pedot:pss , optoelectronics , lamellar structure , irradiation , laser , layer (electronics) , nanotechnology , polymer , optics , composite material , physics , nuclear physics
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.