Multi-dimensional, light-controlled switch of fluorescence resonance energy transfer based on orderly assembly of 0D dye@micro-micelles and 2D ultrathin-layered nanosheets

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• 作者：Zhixiong Li ; Ruizheng Liang ; Simin Xu ; Wendi Liu ; Dongpeng Yan ; Min Wei…
• 关键词：bis(8 ; hydroxyquinolate) zinc (Znq2) ; open ; ring merocyanine ; layered double hydroxide ; layer ; by ; layer self ; assembly ; multi ; dimensional fluorescence resonance energy transfer
• 刊名：Nano Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：9
• 期：12
• 页码：3828-3838
• 全文大小：2,297 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000
• 卷排序：9

文摘

Fluorescence resonance energy transfer (FRET) systems have broad applications in visual detection, intelligent materials, and biological imaging, all of which favor the transmission of light through multiple dimensions and in diverse directions. Herein, we have demonstrated multi-dimensional (0D and 2D) FRET within a multi-layer ultrathin film (UTF) by employing a layer-by-layer (LBL) assembly technique. The anionic block copolymer micelle poly(tert-butyl acrylate-co-ethyl acrylate-co-methacrylic acid) (PTBEM) is chosen as a molecular carrier for the incorporation of bis(8-hydroxyquinolate) zinc (Znq₂) and open-ring merocyanine (MC) (denoted as (Znq₂/MC)@PTBEM). Alternatively, electrostatic assembly is performed with cationic layered double hydroxide (LDH) nanosheets (denoted as [(Znq₂/MC)@PTBEM/LDH]_n). This [(Znq₂/MC)@PTBEM/LDH]_n system offers a multi-dimensional propagation medium and ensures that the FRET donor and acceptor are located within their Förster radii in each direction. The system demonstrates a FRET process that can be switched via alternating ultraviolet/visible (UV/vis) irradiation, with tunable blue–green/red fluorescence, resulting in a FRET efficiency as high as 81.7%. It is expected that this assembly method, which uses 0D micelles on a 2D layered material, can be extended to other systems for further development of multi-dimensional FRET.