Presenter：郭全民博士（英国伯明翰大学）

Topic：Supported metal-organic clusters: stability, mobility and orientational polymorphism

Time：9: 30 AM, November 13^th(Tuesday）

Location：909-B

Abstract

We have recently investigated a Fullerene-metal coordinated system and produced magic number, hybrid (C₆₀)_m-Au_n clusters on the Au(111) surface. The smallest magic number cluster, (C₆₀)₇-Au₁₉, consists of a hexagonal 19-Au atom island capped by seven C₆₀ molecules. The 19-Au island on its own is not stable beyond 200 K, a (C₆₀)₇ cluster on its own is not stable beyond 240 K. The hybrid cluster, however, is stable up to 400 K. The hybrid clusters are held together by neither directional H-bonding nor covalently bonding. Instead, the collective interaction among all the constituents within the cluster is responsible for the stability of the cluster. The nature of such globally optimized interaction gives the clusters some interesting properties: i) Ripening into magic sizes. ii) The ability of the cluster to self-repair and re-shape. iii) Anomalous diffusion via a break-transition-settle route which could be a more general phenomenon for loosely assembled clusters.

Biography

郭全民于1984年获得清华大学学士学位，1989年获得英国兰开斯特大学博士。郭全民是英国物理学会会士（Fellow Inst. Phys.)，英国物理学会纳米物理与技术分会创始人。现任职英国伯明翰大学物理与天文学院。研究领域包括表面科学，纳米物理与技术，低维物质特性，原子与分子自组装。在国际期刊发表文章100余篇。重要研究成果包括创始发展了金属原子与有机分子组合的幻数团簇的研究，硫醇分子自组装单分子膜结构的扫描隧道显微镜分析，二氧化钛表面重构及其电子结构的探索。

代表作：

1. L. Guo, Y. T. Wang, D. Kaya, R. E. Palmer, G-D. Chen, Q. Guo. Nano Lett. 18 (2018) 5257-5261.

2. D. Kaya, D-L. Bao, R. E. Palmer, S-X. Du, Q. Guo. Nano Lett.17 (2017) 6171.

3. Y-C Xie, L. Tang, Q. Guo. Phys. Rev. Lett.111 (2013) 186101.

4. F. S. Li, L. Tang, W-C. Zhou, Q. Guo, J. Am. Chem. Soc. 132 (2010) 13059.

5. Q. Guo, P. Fallon, J. Yin, R. E. Palmer, N. Bampos, J. K. M. Sanders, Adv. Mater. 15 (2003) 1084.

联系人：迟力峰教授

责任编辑：鹿鸣