报告摘要 | 2004年,英国曼彻斯特大学物理学家Andre Geim和Kostya Novoselov发现新型碳材料石墨烯(graphene),该材料展现出诸多前所未有的特性以及极具前景的应用价值,使得石墨烯成为近年来全球科研界最热门的研究课题,两位发现者也获得了2010年诺贝尔物理学奖。然而,石墨烯是零禁带的半导体,要应用到半导体器件中,必须实现禁带宽度的扩展,其中一个方法是制备石墨烯纳米带。蔡金明博士课题组利用有机功能分子成功可控地自下而上合成了一系列石墨烯纳米带,异质结等[1,2]。利用该方法合成的石墨烯纳米带形貌原子级可控,从而达到精确控制石墨烯纳米带的电学性质[3-5],为石墨烯在电子器件上的应用开拓了道路。 [1]. J. Cai, C. Pignedoli, L. Talirz, P. Ruffieux, et.al., Graphene nanoribbon heterojunctions and heterostructures, Nature Nanotechnology, 9, 896 (2014). [2]. J. Cai, P. Ruffieux, R. Jaafar, M. Bieri, et.al., Atomically precise bottom-up fabrication of graphene nanoribbons, NATURE 466, 470 (2010). [3]. P. Ruffieux, J. Cai, N. C. Plumb, L. Patthey et.al., Electronic Structure of Atomically Precise Graphene Nanoribbons, ACS Nano 6, 6930 (2012). [4]. S. Blankenburg, J. Cai, P. Ruffieux, R. Jaafar, D et.al., Intraribbon Heterojunction Formation in Ultranarrow Graphene Nanoribbons, ACS Nano 6, 2020 (2012). [5]. R. Denk, M. Hohage, P. Zeppenfeld, J. Cai, et.al., Exciton-Dominated Optical Response of Ultranarrow Graphene Nanoribbons, Nature Communications 5, 4253 (2014). |