Observation of Nanoscale Cooling Effects by Substrates and the Surrounding Media for Single Gold Nanoparticles under CW-Laser Illumination
Observation of Nanoscale Cooling Effects by Substrates and the Surrounding Media for Single Gold Nanoparticles under CW-Laser Illumination
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DOI：
10.1021/nn402863s
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发表时间：
2013-09-01
期刊：
影响因子：
17.1
通讯作者：
Hashimoto, Shuichi
中科院分区：
文献类型：
--
作者：
Setoura, Kenji;Okada, Yudai;Hashimoto, Shuichi
了解纳米级加热引起的局部热响应是重要的，但由于缺乏如此小尺度的温度信息而受到阻碍。本文报道了金属纳米颗粒在不同衬底上的激光诱导加热和热平衡。我们使用单粒子光谱监测纳米粒子的温度上升，由于激光激发。由于周围介质的折射率的变化，金纳米颗粒的散射光谱经历与系统温度相关的偏移。我们发现，温度的增加取决于周围的介质和支持基板。此外，我们使用一个简化的一维热传导模型，有效的热导率，同时考虑到基板和环境的纳米粒子的温度模型。从这个模型的结果也进行了比较，一个更详细的2-D传热分析。这里提出的结果是相当新的和重要的许多等离子体纳米粒子的应用，其中纳米粒子的强吸收截面导致显着的温度上升。特别是，目前的工作介绍了一种分析，可以很容易地实现，以模拟在基板上支持的纳米粒子的温度，在许多单粒子测量的情况下。
Understanding the nanoscale heating-induced local thermal response is important but hampered by lack of information on temperatures at such small scales. This paper reports laser-induced heating and thermal equilibration of metal nanoparticles supported on different substrates and immersed in several media. We use single-particle spectroscopy to monitor nanoparticle temperature rises due to laser excitation. Because of changes in the refractive index of the surrounding medium, the scattering spectrum of the gold nanoparticles undergoes a shift that is related to the temperature of the system. We find that the temperature increase depends on both the surrounding medium and the supporting substrate. We furthermore model the nanoparticle temperature using a simplified 1-D heat conduction model with an effective thermal conductivity that takes both substrate and environment into account. The results from this model are also compared to a more detailed 2-D heat transfer analysis. The results presented here are quite new and important to many plasmonic nanoparticle applications where the strong absorption cross section of the nanoparticles leads to a significant temperature rise. In particular, the current work Introduces an analysis that can be easily implemented to model the temperature of a nanoparticle supported on a substrate, as is the case in many single-particle measurements.