Orientation-Selective Growth of Single-Atomic-Layer Gold Nanosheets via van der Waals Interlocking and Octanethiolate-Confined Molecular Channels
Orientation-Selective Growth of Single-Atomic-Layer Gold Nanosheets via van der Waals Interlocking and Octanethiolate-Confined Molecular Channels
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通过范德华联锁和辛烷硫醇限制分子通道定向选择性生长单原子层金纳米片
DOI：
10.1021/acs.jpcc.9b07149
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发表时间：
2019
影响因子：
3.7
通讯作者：
Guo Quanmin
中科院分区：
文献类型：
--
作者：
Zhang Xin;Gao Jianzhi;Fan Xing;Wang Yitao;Ding Haoxuan;Qin Xuhui;Jiang Shuhang;Zhao Tiantian;Zhu Gangqiang;Lu Hongbing;Yang Zhibo;Lin Haiping;Li Qing;Chi Lifeng;Pan Minghu;Guo Quanmin
在辛烷硫酸盐（OT）表面活性剂约束下的垂直分子通道引导下，在Au（111）衬底上合成了单原子层金纳米片，这与fcc金属（111）平面同外延中观察到的典型六角形或三角形岛形成了很大的对比。这种异常生长模式显示出对表面活性剂覆盖率的强烈依赖，因此证明了使用表面活性剂覆盖率作为微调金属纳米棒生长形状和长径比的有用控制参数的可能性。Au薄片优先在⟨112⟩方向上生长，其宽度以量子化的方式以6.5a （~ 1.85 nm）的步长变化，其中a是Au原子的最近邻距离。这种意想不到的对称破坏生长模式是由生长的Au片边缘和OT层之间的相互作用引起的，OT层的行为就像覆盖Au（111）衬底和Au片的分子地毯。Au板的生长变形…
Single-atomic-layer gold nanosheets have been synthesized on the Au(111) substrate guided by vertical molecular channels confined by an octanethiolate (OT) surfactant, in great contrast to the typical hexagonal or triangular islands observed in homoepitaxy on the (111) plane of fcc metals. This anomalous growth mode shows a strong dependence on the coverage of the surfactant and hence demonstrates the possibility of using the surfactant coverage as a useful control parameter in fine-tuning the shape and aspect ratio for the growth of metal nanorods. The Au sheet grows preferentially in the ⟨112⟩ direction, and its width changes in a quantized manner in steps of 6.5a (∼1.85 nm), where a is the nearest-neighbor distance for Au atoms. This unexpected symmetry-breaking growth mode is proposed to arise from the interaction between the edges of the growing Au sheet and the OT overlayer, which behaves as a molecular carpet covering both the Au(111) substrate and the Au sheet. The growth of the Au sheet deforms ...