∥Institut Fresnel, UMR 7249, CNRS, Aix Marseille Université, Centrale Marseille, 13013 Marseille, France.
ACS Nano. 2015 May 26;9(5):5551-8. doi: 10.1021/acsnano.5b01673. Epub 2015 May 12.
In this article, we present a comprehensive investigation of the photothermal properties of plasmonic nanowire networks. We measure the local steady-state temperature increase, heat source density, and absorption in Ag, Au, and Ni metallic nanowire networks under optical illumination. This allows direct experimental confirmation of increased heat generation at the junction between two metallic nanowires and stacking-dependent absorption of polarized light. Due to thermal collective effects, the local temperature distribution in a network is shown to be completely delocalized on a micrometer scale, despite the nanoscale features in the heat source density. Comparison of the experimental temperature profile with numerical simulation allows an upper limit for the effective thermal conductivity of a Ag nanowire network to be established at 43 Wm(-1) K(-1) (0.1 κbulk).
在本文中，我们全面研究了等离子体纳米线网络的光热性质。我们在光学照明下测量了 Ag、Au 和 Ni 金属纳米线网络中的局部稳态温度升高、热源密度和吸收。这允许直接实验证实两个金属纳米线之间的连接处产生的热量增加以及偏振光的堆积依赖性吸收。由于热集体效应，尽管热源密度具有纳米级特征，但网络中的局部温度分布在微米尺度上完全是非局域的。将实验温度分布与数值模拟进行比较，可以确定 Ag 纳米线网络的有效热导率上限为 43 Wm(-1) K(-1)(0.1 κbulk)。
