Fabrication of a Stable New Polymorph Gold Nanowire with Sixfold Rotational Symmetry,Advanced Materials

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Fabrication of a Stable New Polymorph Gold Nanowire with Sixfold Rotational Symmetry
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-07 , DOI: 10.1002/adma.201706261
Seonhee Lee ₁ , Changdeuck Bae ₁ , Jubok Lee _{1,

2} , Subin Lee ₂ , Sang Ho Oh ₁ , Jeongyong Kim _{1,

2} , Gyeong-Su Park ₃ , Hyun Suk Jung ₄ , Hyunjung Shin ₁

Affiliation

Gold is known as the most noblest metal with only face‐centered cubic (fcc) structure in ambient conditions. Here, stable hexagonal non‐close‐packed (ncp) gold nanowires (NWs), having a diameter of about 50 nm and aspect ratios of well over 400, are reported. Au NWs are grown in the confined system of nanotubular TiO₂ arrays via photoelectrochemical reduction of HAuCl₄ precursors. Some of the resulting Au NWs are proved to have sixfold rotational symmetry, observed by transmission electron microscopy tilting experiments. This new polymorph is identified as a hexagonal ncp‐structure with lattice parameters of a = 2.884 Å and c = 7.150 Å, showing quite a large interplanar spacing (c/a ≈ 2.48). That is, Au atoms are close‐packed along the ab plane, but each plane is not closely stacked along the c axis like in graphite. The structure is usually expected to be unstable, but the present ncp‐2H gold is stable under ambient conditions and intense electron beam irradiation, and shows thermal stability up to 400 °C. Moreover, the resulting physical properties as a result of the corresponding change in electronic structures are investigated by comparing the optical properties of fcc and ncp‐2H Au NWs.

中文翻译：

具有六重旋转对称性的稳定的新型多晶型金纳米线的制备

在环境条件下，金被认为是最贵的金属，只有面心立方（fcc）结构。在这里，报道了直径约50 nm，长径比超过400的稳定的六角形非密排（ncp）金纳米线（NWs）。通过光电化学还原HAuCl ₄前体，在纳米管TiO ₂阵列的受限系统中生长金纳米线。通过透射电子显微镜倾斜实验观察到，一些所得的金纳米线被证明具有六重旋转对称性。这种新的多晶型物被识别为六边形ncp结构，其晶格参数为a = 2.884Å和c= 7.150埃，示出相当大的晶面间距（ç /一≈2.48）。也就是说，Au原子沿ab平面紧密堆积，但每个平面都不像石墨那样沿c轴紧密堆积。通常预期该结构是不稳定的，但是目前的ncp -2H金在环境条件和强电子束辐照下是稳定的，并在高达400°C的温度下显示出热稳定性。此外，通过比较fcc和ncp -2H Au NWs的光学性质，研究了由于电子结构发生相应变化而产生的物理性质。

更新日期：2018-03-07

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