One‐dimensional assemblies of metal nanoparticles (NPs) may represent an interesting plasmonic superstructure, in which localized surface plasmon resonance of individual NPs can be coupled to modify the strength and wavelength of extinction of metal NPs. In this study, we explored a simple method to assemble Au NPs into a linear chain by utilizing a low‐dielectric solvent and salts. The aggregation states of Au NPs were engineered by the concentration of salts, which resulted in isolated and linearly assembled Au NPs. In addition, the TiO₂ shell, as a stabilizing layer, was synthesized on the surface of the isolated and assembled Au NPs by a slow hydrolysis process. Because the linearly assembled Au NPs with a TiO₂ shell had a broad extinction spectrum by plasmon hybridization, they could absorb more photons under simulated solar irradiation. As a result, the linearly assembled Au NPs with a TiO₂ shell exhibited an enhanced photothermal effect, compared with the isolated ones.

中文翻译：

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由TiO2壳包裹的Au纳米粒子的一维组件增强的光热加热

金属纳米粒子（NP）的一维组装可能代表了有趣的等离子体超结构，其中单个NP的局部表面等离子体激元共振可以耦合以改变金属NP的消光强度和波长。在这项研究中，我们探索了一种利用低介电溶剂和盐将金纳米颗粒组装成线性链的简单方法。Au NPs的聚集状态是通过盐的浓度来设计的，这导致分离并线性组装的Au NPs。此外，通过稳定的水解过程，在分离和组装的金纳米颗粒的表面上合成了作为稳定层的TiO ₂壳。因为线性组装的金纳米颗粒与TiO ₂外壳通过等离激元杂交具有较宽的消光光谱，在模拟太阳辐射下它们可以吸收更多的光子。结果，与分离的那些相比，具有TiO ₂壳的线性组装的Au NP表现出增强的光热效应。