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Nonvolatile, Multicolored Photothermal Writing of Block Copolymer Structural Color

机译：嵌段共聚物结构颜色的非易失性，彩色光热书写

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摘要

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.
机译：尽管努力制造自组装嵌段共聚物（BCP）光子晶体（PC）的刺激敏感结构颜色（SC），并将其潜在地应用于显示器，媒体板和传感器，但很少有研究表明BCP PC适用于密度非易失性信息存储。在此，提出了一种简单而健壮的路线，用于使用BCP PC进行多级非易失性信息记录。所提出的方法基于由光热转化引起的BCP PC的微区的空间控制交联。光热SC写入是通过在薄（聚苯乙烯-季铵化的2-乙烯基吡啶）（PS-b-QP2VP）PC薄膜上沉积的聚（3,4-乙撑二氧噻吩）薄膜上进行时间和位置控制的激光曝光来完成的掺杂有甲苯磺酸盐（PP-PEDOT）。在此结构的近红外（NIR）辐射下，PP-PEDOT底层将NIR光转换为局部辐射区域中的热能，随后将其转移到BCP顶层，该BCP顶层由交替的面内PS和QP2VP层状堆叠组成。 QP2VP层很容易发生热交联，从而产生了本地可编程SC。 QP2VP域的交联度取决于激光功率和曝光时间，这允许每个光点进行多SC记录，从而形成了一种基于BCP PC的新型多层光学记录介质。

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