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金纳米带向七边形团簇填充结构的相变
作者:小柯机器人 发布时间:2022/1/16 0:07:45

中科院金属所杜奎团队报道了金纳米带向七边形团簇填充结构的相变。相关研究成果于2022年1月13日发表在国际顶尖学术期刊《美国化学会杂志》。

将周期性晶体转变为原子团簇的堆积,无论是在基础研究还是潜在应用方面都吸引了巨大的兴趣,但对于贵金属来说,这仍然是一个巨大的挑战。

该文中,研究人员观察到了由七边形团簇填充的金纳米带,其中每两个或三个组成团簇与它们的邻居边对边连接。这是首次报道的由七边形对称块填充而成的金属结构。团簇填充纳米带在拉伸条件下由二维六方结构转变而来,在压缩条件下发生反向转变,通过原位观察分析了该问题。通过s-d轨道杂化,稳定了团簇堆积结构。

理论计算表明,薄带的电导在相变过程中经历了从6到4 G0(G0=2e2/h)的量子化变化,在反向相变过程中经历了反向量子化变化。

附:英文原文

Title: Phase Transition to Heptagonal-Cluster-Packed Structure of Gold Nanoribbons

Author: Chunjin Chen, Kepeng Song, Xuelu Wang, Kui Du

Issue&Volume: January 13, 2022

Abstract: Transforming periodic crystals into packing of atomic clusters is attracting enormous interest for both fundamental research and potential application, but it still remains a big challenge for noble metals. Here, we have observed gold nanoribbons packed with heptagonal clusters, where every two or three constituent clusters connect edge-to-edge with their neighbors. This is the first reported metallic structure packed from building blocks with heptagonal symmetry. The cluster-packed nanoribbons transited from two-dimensional hexagonal structure under tensile condition and a reverse transition occurred by compression, resolved by in situ observation. The cluster-packed structure was stabilized by the s–d orbital hybridization. Theoretical calculations demonstrate that the conductance of the ribbons undergoes a quantized change from 6 to 4 G0 (G0 = 2e2/h) during the phase transition and backward for the reverse transition.

DOI: 10.1021/jacs.1c12713

Source: https://pubs.acs.org/doi/10.1021/jacs.1c12713

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000