论文标题
柔性等离子材料中的合作纳米颗粒自组装和光热加热
Cooperative nanoparticle self-assembly and photothermal heating in a flexible plasmonic metamaterial
论文作者
论文摘要
我们从理论上研究了由芳香纳米纤维和金纳米颗粒组成的柔性等离子材料的平衡行为和光热效应。纤维基质被认为是重新配置纳米颗粒组件的外场。我们发现，加热过程调谐颗粒粒子和光纤颗粒相互作用，这些相互作用会改变纳米颗粒在纤维表面上的吸附或孔隙空间中的聚类。因此，可以通过激光照明来控制纳米颗粒自组装。金纳米颗粒强烈吸收辐射，并有效地将吸收的能量耗散到热量中。通过求解与有效培养基近似相关的传热方程，我们计算了空间温度升高。值得注意的是，我们的理论结果定量与先前的实验一致。这表明我们可以忽略粒子聚类引起的等离子耦合效应。还讨论了激光点大小和强度对光热加热的影响。
We theoretically investigate equilibrium behaviors and photothermal effects of a flexible plasmonic metamaterial composed of aramid nanofibers and gold nanoparticles. The fiber matrix is considered as an external field to reconfigure a nanoparticle assembly. We find that the heating process tunes particle-particle and fiber-particle interactions, which alter adsorption of nanoparticles on fiber surfaces or clustering in pore spaces. Thus, it is possible to control the nanoparticle self-assembly by laser illumination. Gold nanoparticles strongly absorb radiations and efficiently dissipate absorbed energy into heat. By solving the heat transfer equation associated with an effective medium approximation, we calculate the spatial temperature rise. Remarkably, our theoretical results quantitatively agree with prior experiments. This indicates that we can ignore plasmonic coupling effects induced by particle clustering. Effects of the laser spot size and intensity on the photothermal heating are also discussed.
