Mba Joshua Chidiebere, Mitomo Hideyuki, Yonamine Yusuke, Wang Guoqing, Matsuo Yasutaka, Ijiro Kuniharu
Graduate School of Life Science, Hokkaido University, Kita 10, Nishi 8, Kita-Ku, Sapporo 060-0810, Hokkaido, Japan.
Research Institute for Electronic Science, Hokkaido University, Kita 21, Nishi 10, Kita-Ku, Sapporo 001-0021, Hokkaido, Japan.
Nanomaterials (Basel). 2022 Apr 21;12(9):1421. doi: 10.3390/nano12091421.
Anisotropic gold nanodiscs (AuNDs) possess unique properties, such as large flat surfaces and dipolar plasmon modes, which are ideal constituents for the fabrication of plasmonic assemblies for novel and emergent functions. In this report, we present the thermo-responsive assembly and thermo-dynamic behavior of AuNDs functionalized with methyl-hexa(ethylene glycol) undecane-thiol as a thermo-responsive ligand. Upon heating, the temperature stimulus caused a blue shift of the plasmon peak to form a face-to-face assembly of AuNDs due to the strong hydrophobic and van der Waals interactions between their large flat surfaces. Importantly, AuNDs allowed for the incorporation of the carboxylic acid-terminated ligand while maintaining their thermo-responsive assembly ability. With regard to their reversible assembly/disassembly behavior in the thermal cycling process, significant rate-independent hysteresis, which is related to their thermo-dynamics, was observed and was shown to be dependent on the carboxylic acid content of the surface ligands. As AuNDs have not only unique plasmonic properties but also high potential for attachment due to the fact of their flat surfaces, this study paves the way for the exploitation of AuNDs in the development of novel functional materials with a wide range of applications.
各向异性金纳米盘（AuNDs）具有独特的性质，如大的平面表面和偶极等离子体激元模式，这些都是用于制造具有新颖和新兴功能的等离子体组件的理想成分。在本报告中，我们展示了用甲基 - 六（乙二醇）十一烷硫醇作为热响应配体功能化的AuNDs的热响应组装和热力学行为。加热时，温度刺激导致等离子体激元峰蓝移，由于AuNDs大平面表面之间强烈的疏水和范德华相互作用，形成了AuNDs的面对面组装。重要的是，AuNDs在保持其热响应组装能力的同时，允许引入羧酸封端的配体。关于它们在热循环过程中可逆的组装/拆卸行为，观察到与它们的热力学相关的显著的与速率无关的滞后现象，并且表明该现象取决于表面配体的羧酸含量。由于AuNDs不仅具有独特的等离子体激元性质，而且因其平面表面而具有高附着潜力，本研究为在开发具有广泛应用的新型功能材料中利用AuNDs铺平了道路。
