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Triggering the volume phase transition of core-shell Au nanorod-microgel nanocomposites with light

机译：用光触发核-壳金纳米棒-微凝胶纳米复合材料的体积相变

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摘要

We have coated gold nanorods (NRs) with thermoresponsive microgel shells based on poly(N-isopropylacrylamide) (pNIPAM). We demonstrate by simultaneous laser-heating and optical extinction measurements that the Au NR cores can be simultaneously used as fast optothermal manipulators (switchers) and sensitive optical reporters of the microgel state in a fully externally controlled and reversible manner. We support our results with optical modeling based on the boundary element method and 3D numerical analysis on the temperature distribution. Briefly, we show that due to the sharp increase in refractive index resulting from the optothermally triggered microgel collapse, the longitudinal plasmon band of the coated Au NRs is significantly red-shifted. The optothermal control over the pNIPAM shell, and thereby over the optical response of the nanocomposite, is fully reversible and can be simply controlled by switching on and off a NIR heating laser. In contrast to bulk solution heating, we demonstrate that light-triggering does not compromise colloidal stability, which is of primary importance for the ultimate utilization of these types of nanocomposites as remotely controlled optomechanical actuators, for applications spanning from drug delivery to photonic crystals and nanoscale motion.
机译：我们已经在基于聚（N-异丙基丙烯酰胺）（pNIPAM）的热响应性微凝胶壳上涂了金纳米棒（NRs）。我们通过同时进行激光加热和消光测量证明，Au NR磁芯可以完全外部控制和可逆的方式同时用作快速光热操纵器（切换器）和微凝胶状态的敏感光学报告分子。我们通过基于边界元法的光学建模和温度分布的3D数值分析来支持我们的结果。简而言之，我们表明由于光热触发的微凝胶塌陷导致折射率的急剧增加，包被的Au NRs的纵向等离激元带显着红移。通过pNIPAM外壳进行光热控制，从而控制纳米复合材料的光学响应，是完全可逆的，并且可以通过打开和关闭NIR加热激光器简单地进行控制。与本体溶液加热相反，我们证明了光触发不会损害胶体稳定性，这对于最终将这些类型的纳米复合材料用作远程控制的光机械致动器至关重要，适用于从药物输送到光子晶体和纳米级的应用运动。

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