Confinement-Assisted Specific Fluorescence Detection of Fe3+ in Aqueous Solution by Styrylpyrene-Based Microgels

IF 4.4 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Wei Huang, Ruijie Hou, Zehui Jiao, Jiefeng Zhu, Xianjing Zhou* and Xinping Wang*, 
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Abstract

In recent years, fluorescent sensors have played a compelling role in the precise detection of metal ions. However, most fluorophores are hydrophobic and cannot be used to detect aqueous samples directly. Researchers have thus addressed this problem by combining fluorophores with hydrophilic polymer carriers. Nevertheless, most studies have focused only on the role of fluorophores in the recognition of metal ions, ignoring the effect of polymers and their aggregation states on the detection. In this work, microgels with pyrene-based fluorescent cross-linked structures were prepared using a post-cross-linking strategy and were found to specifically detect Fe3+ directly in aqueous solutions without interference from other metal ions (i.e., Al3+, Ba2+, Cd2+, Co2+, Cr3+, Cu2+, Ni2+, Pb2+, Zn2+, Fe2+, Hg2+, Na+, K+, Ca2+, or Mg2+). The detection limit is 2.3 μM, which is lower than the U.S. Environmental Protection Agency’s safety limit for drinking water. The fluorescence quenching of microgels by Fe3+ was effective by both mechanisms (dynamic and static), mainly the static one. Nanoscale microgels allow Fe3+ to be confined around the pyrene of their fluorescent cross-linked structures, which induces nonradiative energy transfer and leads to fluorescence quenching of the microgels. Such a detection method utilizing the confinement effect of microgels to synergize fluorescence quenching provides an idea for the development of fluorescent sensors.

Abstract Image

苯乙烯基微凝胶的禁锢辅助特异荧光检测水溶液中Fe3+
近年来,荧光传感器在金属离子的精确检测中发挥了引人注目的作用。然而,大多数荧光团是疏水的,不能直接用于检测含水样品。因此,研究人员通过将荧光团与亲水聚合物载体结合来解决这个问题。然而,大多数研究只关注荧光团在金属离子识别中的作用,而忽略了聚合物及其聚集状态对检测的影响。在这项工作中,使用后交联策略制备了具有芘基荧光交联结构的微凝胶,发现它可以特异性地直接检测水溶液中的Fe3+,而不受其他金属离子(即Al3+, Ba2+, Cd2+, Co2+, Cr3+, Cu2+, Ni2+, Pb2+, Zn2+, Fe2+, Hg2+, Na+, K+, Ca2+或Mg2+)的干扰。检测限为2.3 μM,低于美国环境保护署饮用水安全标准。Fe3+对微凝胶的荧光猝灭作用有动态猝灭和静态猝灭两种机制,其中以静态猝灭为主。纳米级微凝胶允许Fe3+被限制在其荧光交联结构的芘周围,这引起非辐射能量转移并导致微凝胶的荧光猝灭。这种利用微凝胶的约束效应协同荧光猝灭的检测方法为荧光传感器的发展提供了思路。
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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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