Song Yongbo, Li Yingwei, Zhou Meng, Li Hao, Xu Tingting, Zhou Chuanjun, Ke Feng, Huo Dayujia, Wan Yan, Jie Jialong, Xu Wen Wu, Zhu Manzhou, Jin Rongchao
Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, Hefei, Anhui, 230601, China.
School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei, Anhui, 230032, China.
Nat Commun. 2022 Mar 9;13(1):1235. doi: 10.1038/s41467-022-28829-0.
The growth of nanoparticles along one or two directions leads to anisotropic nanoparticles, but the nucleation (i.e., the formation of small seeds of specific shape) has long been elusive. Here, we show the total structure of a seed-sized Au nanoprism, in which the side Au{100} facets are surrounded by bridging thiolates, whereas the top/bottom {111} facets are capped by phosphine ligands at the corners and Br at the center. The bromide has been proved to be the key to effectively stabilize the Au{111} to fulfill a complete face-centered-cubic core. In femtosecond electron dynamics analysis, the non-evolution of transient absorption spectra of Au is similar to that of larger-sized gold nanoclusters (n > 100), which is ascribed to the completeness of the prismatic Au core and an effective electron relaxation pathway created by the stronger Au-Au bonds inside. This work provides some insights for the understanding of plasmonic nanoprism formation.
纳米颗粒沿一个或两个方向生长会导致形成各向异性纳米颗粒，但成核过程（即形成特定形状的小晶种）长期以来一直难以捉摸。在此，我们展示了种子尺寸的金纳米棱柱的整体结构，其中侧面的Au{100}面被桥连硫醇盐包围，而顶部/底部的{111}面在角落处由膦配体封端，中心由溴封端。已证明溴化物是有效稳定Au{111}以形成完整面心立方核的关键。在飞秒电子动力学分析中，金的瞬态吸收光谱不发生演化，这与较大尺寸的金纳米团簇（n > 100）类似，这归因于棱柱形金核的完整性以及内部较强的金 - 金键所形成的有效电子弛豫途径。这项工作为理解等离子体纳米棱柱的形成提供了一些见解。
