Thermoresponsive Fluorescence Switches Based on Au@pNIPAM Nanoparticles,Langmuir

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Thermoresponsive Fluorescence Switches Based on Au@pNIPAM Nanoparticles
Langmuir ( IF 3.7 ) Pub Date : 2021-09-03 , DOI: 10.1021/acs.langmuir.1c01397
Dana Kamzabek ₁ , Brieuc Le Dé ₁ , Liliane Coche-Guérente ₂ , Fabien Miomandre ₁ , Galina V Dubacheva _{1,

2}

Affiliation

Despite numerous studies emphasizing the plasmonic impact on fluorescence, the design of a dynamic system allowing on-demand fluorescence switching in a single nanostructure remains challenging. The reversibility of fluorescence switching and the versatility of the approach, in particular its compatibility with a wide range of nanoparticles and fluorophores, are among the main experimental difficulties. In this work, we achieve reversible fluorescence switching by coupling metal nanoparticles with fluorophores through stimuli-responsive organic linkers. As a proof of concept, we link gold nanoparticles with fluorescein through thermoresponsive poly(N-isopropylacrylamide) at a tunable grafting density and characterize their size and optical response by dynamic light scattering, absorption, and fluorescence spectroscopies. We show that the fluorescence emission of these hybrid nanostructures can be switched on-demand using the thermoresponsive properties of poly(N-isopropylacrylamide). The described system presents a general strategy for the design of nanointerfaces, exhibiting reversible fluorescence switching via external control of metal nanoparticle/fluorophore distance.

中文翻译：

基于 Au@pNIPAM 纳米颗粒的热响应荧光开关

尽管许多研究强调等离子体对荧光的影响，但允许在单个纳米结构中按需荧光切换的动态系统的设计仍然具有挑战性。荧光转换的可逆性和该方法的多功能性，特别是它与各种纳米颗粒和荧光团的兼容性，是主要的实验难点。在这项工作中，我们通过刺激响应性有机接头将金属纳米颗粒与荧光团耦合来实现可逆荧光转换。作为概念证明，我们通过热敏聚（N-异丙基丙烯酰胺）以可调接枝密度，并通过动态光散射、吸收和荧光光谱表征它们的大小和光学响应。我们表明，这些混合纳米结构的荧光发射可以使用聚（N-异丙基丙烯酰胺）的热响应特性按需切换。所描述的系统提出了纳米界面设计的一般策略，通过金属纳米粒子/荧光团距离的外部控制表现出可逆的荧光切换。

更新日期：2021-09-21

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