This article describes a novel strategy for assembling gold nanoparticles (AuNPs) into chainlike structures and modulating their assembly by surface engineering. The chainlike assemblies are induced to form by adding ethylamine (EA) into a suspension of AuNPs, and the volume ratio of ethanol/water greatly affects the assembly speed and length of the chainlike assemblies. By comparing various structural analogs of EA, it is demonstrated that the primary amine of EA is critically important for AuNP assembly. This study also reveals that besides dielectric surrounding and destabilizing agents, surface engineering also significantly influences the optical properties of plasmonic nanostructures. During this assembly, we have found that two kinds of additives could inhibit or mitigate the AuNP assembly, which were barely reported. The effects of AgNO₃ and halogen compounds, especially KI, on the assembly of AuNPs were studied in detail. Possible mechanisms for controlling AuNP assembly through surface engineering are proposed. Taken together, this study provides a new strategy to regulate the assembly of plasmonic nanoparticles and points out the importance of surface engineering in assembly.

中文翻译：

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表面工程对乙胺介导的等离子体金纳米粒子组装的影响

本文描述了一种将金纳米粒子 (AuNPs) 组装成链状结构并通过表面工程调节其组装的新策略。通过在 AuNPs 悬浮液中加入乙胺 (EA) 诱导形成链状组装体，乙醇/水的体积比极大地影响了链状组装体的组装速度和长度。通过比较 EA 的各种结构类似物，证明 EA 的伯胺对于 AuNP 组装至关重要。这项研究还表明，除了电介质周围和去稳定剂外，表面工程还显着影响等离子体纳米结构的光学特性。在这个组装过程中，我们发现两种添加剂可以抑制或减轻 AuNP 组装，而这几乎没有报道。AgNO 的影响₃和卤素化合物，尤其是 KI，对 AuNPs 的组装进行了详细研究。提出了通过表面工程控制 AuNP 组装的可能机制。总之，这项研究提供了一种新的策略来调节等离子体纳米粒子的组装，并指出表面工程在组装中的重要性。