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首页> 外文期刊>Nanotechnology >Plasmonic photothermal heating of gold nanostars in a real-size container: multiscale modelling and experimental study
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Plasmonic photothermal heating of gold nanostars in a real-size container: multiscale modelling and experimental study

机译：真尺寸容器中金纳米螺母的等离子体光热加热：多尺度建模和实验研究

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摘要

The ability of noble metal nanoparticles (NPs) to convert light into heat has triggered a lot of scientific interest due to the numerous potential applications, including, e.g. photothermal therapy or laser-based nanopatterning. In order for such applications to be practically implemented, the heating behaviour of NPs embedded in their surrounding medium has to be thoroughly understood, and theoretical models capable of predicting this behaviour must be developed. Here we propose a multiscale approach for modelling the photothermal response of a large ensemble of nanoparticles contained within a cm-scale, real-size container. Electromagnetic field, ray tracing and heat transfer simulations are combined in order to model the response of nanostars and nanospheres suspensions contained within a common Eppendorf tube. To validate the model, gold nanostars are then synthesised and characterized by electron microscopy and optical spectroscopy. Laser-induced heating experiments are conducted by irradiating colloid-filled Eppendorf tubes with a 785 nm continuous wave laser and monitoring by a thermographic camera. The experimental results confirm that the proposed model has potential for predicting and analysing the heating efficiency and temperature dynamics upon laser irradiation of plasmonic nanoparticle suspensions in real-scale containers, at cm(3) volumes.
机译：由于许多潜在的应用，贵金属纳米颗粒（NPS）将光线转化为热量的能力已经引发了许多科学的兴趣，包括例如，包括，例如，光热疗法或基于激光的纳米仪。为了实际实施的这种应用，必须彻底理解嵌入其周围介质中的NP的加热行为，并且必须开发能够预测该行为的理论模型。在这里，我们提出了一种多尺度方法，用于对CM级，实尺寸容器中包含的纳米颗粒的大型集合的光热响应进行建立。组合电磁场，射线跟踪和传热模拟，以模拟普通Eppendorf管内包含的纳米螺柱和纳米悬浮液的响应。为了验证模型，然后通过电子显微镜和光学光谱合成镀金纳米键和以光谱为特征。激光诱导的加热实验通过用785nm连续波激光照射填充胶体填充的Eppendorf管并由热敏摄像机进行监测来进行。实验结果证实，所提出的模型具有预测和分析在实际尺度容器中激光照射等级容器中的激光辐射时的加热效率和温度动力学的可能性。

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