NBN-doped nanographene embedded with five-and seven-membered rings on Au(111) surface

• 作 者: Huan Yang Yun Cao Yixuan Gao Yubin Fu Li Huang Junzhi Liu Xinliang Feng Shixuan Du Hong-Jun Gao
• 机 构: Institute of Physics and University of Chinese Academy of Sciences,Beijing 100190,China;Center for A
• 出 处: 中国物理B（英文版）
• 发表日期: 2021年5期
• 关键词: on-surface synthesis nanographene nonhexagonal rings scanning tunneling microsco

Nanographenes (NGs) can be embedded with predesigned dopants or nonhexagonal rings to tailor the electronic properties and provide ideal platforms to study the unique physical and chemical properties.Here,we report the on-surface synthesis of NBN-doped NG embedded with five-and seven-membered rings (NBN-575-NG) on Au(111) from a oligophenylene precursor preinstalled with a NBN unit and a heptagonal ring.Scanning tunneling microscopy and non-contact atomic force microscopy images elucidate the intramolecular cyclodehydrogenation and the existence of the five-and seven-membered rings.Scanning tunneling spectroscopy spectra reveal that the NBN-575-NG is a semiconductor,which agrees with the density functional theory calculation results on a freestanding NBN-575-NG with the same structure.This work provides a feasible approach for the on-surface synthesis of novel NGs containing non-hexagonal rings.