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

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Title
Fabrication of a Stable New Polymorph Gold Nanowire with Sixfold Rotational Symmetry
Author(s)
Seonhee Lee; Changdeuck Bae; Jubok Lee; Subin Lee; Sang Ho Oh; Jeongyong Kim; Gyeong-Su Park; Hyun Suk Jung; Hyunjung Shin
Publication Date
2018-04
Journal
ADVANCED MATERIALS, v.30, no.16, pp.1706261 -
Publisher
WILEY-V C H VERLAG GMBH
Abstract
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 angstrom and c = 7.150 angstrom, showing quite a large interplanar spacing (c/a approximate to 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 degrees 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 © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/4568
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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