Structural Model of Ultrathin Gold Nanorods Based on High-Resolution Transmission Electron Microscopy: Twinned 1D Oligomers of Cuboctahedrons
Structural Model of Ultrathin Gold Nanorods Based on High-Resolution Transmission Electron Microscopy: Twinned 1D Oligomers of Cuboctahedrons
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基于高分辨率透射电子显微镜的超薄金纳米棒结构模型：立方八面体的孪晶一维低聚物
DOI：
10.1021/acs.jpcc.6b12198
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Tatsuya Tsukuda
中科院分区：
文献类型：
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作者：
Ryo Takahata;Seiji Yamazoe;Kiichirou Koyasu;Tatsuya Tsukuda
最近，我们开发了一种超薄金纳米棒（AuUNR）的合成方法，其直径固定为~1.8 nm，长度在6-400 nm范围内变化。据报道，这些 AuUNR 表现出强烈的红外吸收，归因于局域表面等离子共振的纵向模式，并在表面活性剂浓度降低和温度升高时由于瑞利样不稳定性而分解成球体。为了了解 AuUNR 的结构-性质相关性，本工作使用像差校正高分辨率透射电子显微镜检查了它们的原子结构。统计分析表明，在 AuUNR（直径 ≈ 1.8；长度 ≈ 18 nm）中观察到的最丰富的结构是多重孪晶晶体，长度周期为 ∼1.4 nm。我们提出 AuUNR 由立方八面体 Au147 单元组成，它们通过孪生缺陷一维连接。
Recently, we have developed a synthetic method of ultrathin gold nanorods (AuUNRs) with a fixed diameter of ∼1.8 nm and variable lengths in the range of 6–400 nm. It was reported that these AuUNRs exhibited intense IR absorption assigned to the longitudinal mode of localized surface plasmon resonance and broke up into spheres owing to Rayleigh-like instability at reduced surfactant concentration and at elevated temperatures. In order to understand the structure–property correlation of AuUNRs, their atomic structures were examined in this work using aberration-corrected high-resolution transmission electron microscopy. Statistical analysis revealed that the most abundant structure observed in the AuUNRs (diameter ≈ 1.8; length ≈ 18 nm) was a multiply twinned crystal, with a periodicity of ∼1.4 nm in length. We propose that the AuUNRs are composed of cuboctahedral Au147units, which are connected one-dimensionally through twin defects.