Photothermal Microscopy of Coupled Nanostructures and the Impact of Nanoscale Heating in Surface Enhanced Raman Spectroscopy.
Photothermal Microscopy of Coupled Nanostructures and the Impact of Nanoscale Heating in Surface Enhanced Raman Spectroscopy.
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DOI：
10.1021/acs.jpcc.7b01220
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发表时间：
2017-06-01
期刊：
影响因子：
--
通讯作者：
Schultz ZD
中科院分区：
文献类型：
--
作者：
Zeng ZC;Wang H;Johns P;Hartland GV;Schultz ZD
等离子体纳米粒子的光学性质强烈依赖于与其他纳米粒子的相互作用，这使得对大于几个粒子的系统的分析变得复杂。在这项工作中，我们研究了聚集的纳米粒子的热耗散，及其对表面增强拉曼散射（Sers）的影响，通过相关光热外差成像，电子显微镜和Sers测量。对于二聚体的每个粒子的吸收截面显示粒子间耦合的证据，然而，效果是远远小于那些场增强，是重要的Sers。对于较大的聚集体，观察到总吸收与聚集体体积简单成比例。这一观察使我们能够通过假设粒子作为独立的热源来模拟聚集体中的光吸收和加热。散热计算表明，非常高的温度可以在纳米颗粒表面创建，并且温度随着周围环境的热导率的增加而降低。这与Sers测量结果一致，该测量结果显示与水环境相比，空气的信号衰减更快。
The optical properties of plasmonic nanoparticles are strongly dependent on interactions with other nanoparticles, which complicates analysis for systems larger than a few particles. In this work we examined heat dissipation in aggregated nanoparticles, and its influence on surface enhanced Raman scattering (SERS), through correlated photothermal heterodyne imaging, electron microscopy and SERS measurements. For dimers the per particle absorption cross-sections show evidence of interparticle coupling, however, the effects are much smaller than those for the field enhancements that are important for SERS. For larger aggregates the total absorption was observed to be simply proportional to aggregate volume. This observation allows us to model light absorption and heating in the aggregates by assuming that the particles act as independent heat sources. The heat dissipation calculations show that very high temperatures can be created at the nanoparticle surface, and that the temperature decreases with increasing thermal conductivity of the surroundings. This is in agreement with the SERS measurements that show faster signal degradation for air compared to water environments.
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影响因子：
16.6
作者：
Caldarola M;Albella P;Cortés E;Rahmani M;Roschuk T;Grinblat G;Oulton RF;Bragas AV;Maier SA
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影响因子：
16.6
作者：
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影响因子：
10.8
作者：
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