Intraribbon Heterojunction Formation in Ultranarrow Graphene Nanoribbons
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- 作者：Stephan Blankenburg ; Jinming Cai ; Pascal Ruffieux ; Rached Jaafar ; Daniele Passerone ; Xinliang Feng ; Klaus M眉llen ; Roman Fasel ; Carlo A. Pignedoli
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：March 27, 2012
- 年：2012
- 卷：6
- 期：3
- 页码：2020-2025
- 全文大小：900K
- 年卷期：v.6,no.3(March 27, 2012)
- ISSN：1936-086X
文摘
Graphene nanoribbons鈥攕emiconducting quasi-one-dimensional graphene structures鈥攈ave great potential for the realization of novel electronic devices. Recently, graphene nanoribbon heterojunctions鈥攊nterfaces between nanoribbons with unequal band gaps鈥攈ave been realized with lithographic etching techniques and via chemical routes to exploit quantum transport phenomena. However, standard fabrication techniques are not suitable for ribbons narrower than 5 nm and do not allow to control the width and edge structure of a specific device with atomic precision. Here, we report the realization of graphene nanoribbon heterojunctions with lateral dimensions below 2 nm via controllable dehydrogenation of polyanthrylene oligomers self-assembled on a Au(111) surface from molecular precursors. Atomistic simulations reveal the microscopic mechanisms responsible for intraribbon heterojunction formation. We demonstrate the capability to selectively modify the heterojunctions by activating the dehydrogenation reaction on single units of the nanoribbons by electron injection from the tip of a scanning tunneling microscope.