Department of Electrical and Computer Engineering, University of Missouri, Columbia, MO 65201, United States of America.
Nanotechnology. 2018 Sep 28;29(39):395501. doi: 10.1088/1361-6528/aad017. Epub 2018 Jun 29.
In situ dynamic temperature mapping of photothermally heated aluminum nanoparticles (Al NPs) embedded in a fluoropolymer (THV) is achieved using fluorescent dye (rhodamine 6G). A plasmonic grating substrate enhances the dye fluorescence intensity by a factor of seven over a glass substrate, to enable image capture rates of 500 frames per second. Further, the fluorescence intensity is linearly related to temperature and reversible. Photothermal heating of embedded Al NPs using a 2380 W cm incident flux produced an Al NP heating rate of 1.2 × 10 °C s. Localized Al NP motion was also observed and attributed to thermal expansion and melting of the polymer. Multiphysics simulation provided agreement with experimental observations, bolstering confidence in the technique. The plasmonic grating platforms were shown to significantly improve both fluorescence intensity and the photothermal heating of Al compared to glass substrates, opening a new path for fast and high-resolution in situ temperature mapping.
通过使用荧光染料（若丹明 6G），实现了对嵌入氟聚合物（THV）中的光热加热铝纳米颗粒（Al NPs）的原位动态温度测绘。与玻璃衬底相比，等离子体光栅衬底将染料荧光强度增强了七倍，从而实现了每秒 500 帧的图像捕获速度。此外，荧光强度与温度呈线性关系且具有可逆性。使用 2380 W cm 的入射通量对嵌入的 Al NPs 进行光热加热，产生了 1.2×10°C s 的 Al NP 加热速率。还观察到了局部 Al NP 运动，并将其归因于聚合物的热膨胀和熔化。多物理场模拟与实验观察结果一致，增强了对该技术的信心。与玻璃衬底相比，等离子体光栅平台显著提高了 Al 的荧光强度和光热加热效果，为快速和高分辨率的原位温度测绘开辟了新途径。
