National Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donat Str., 400293 Cluj-Napoca, Romania.
Nanotechnology. 2020 Mar 20;31(12):125701. doi: 10.1088/1361-6528/ab5d83. Epub 2019 Nov 29.
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 volumes.
由于潜在的应用广泛，包括光热疗法或基于激光的纳米图案化等，贵金属纳米粒子（NPs）将光转化为热的能力引发了大量的科学兴趣。为了实际应用这些应用，必须彻底了解嵌入其周围介质中的 NPs 的加热行为，并开发能够预测这种行为的理论模型。在这里，我们提出了一种用于模拟包含在 cm 尺度实际尺寸容器中的大量纳米粒子的光热响应的多尺度方法。电磁场、光线追踪和传热模拟相结合，以模拟包含在普通艾本德管中的纳米星和纳米球悬浮液的响应。为了验证该模型，然后通过电子显微镜和光学光谱法合成和表征金纳米星。通过用 785nm 连续波激光辐照充满胶体的艾本德管并通过热成像相机进行监测，进行激光诱导加热实验。实验结果证实，该模型具有在 cm 体积的实际规模容器中对等离子体纳米粒子悬浮液进行激光辐照时预测和分析加热效率和温度动态的潜力。
