Two-Step On-Surface Synthesis of One-Dimensional Nanographene Chains
Two-Step On-Surface Synthesis of One-Dimensional Nanographene Chains
复制标题
一维纳米石墨烯链的两步表面合成
DOI：
10.1021/acs.jpcc.3c00373
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Yokoyama Takashi
中科院分区：
文献类型：
--
作者：
Ooe Hiroaki;Ikeda Kaede;Yokoyama Takashi
低维石墨烯结构的可控制造是一个具有科学和技术意义的问题。迄今为止，人们在纳米石墨烯链以及纳米石墨烯和石墨烯纳米带的制造方面做出了巨大的努力。在这里，我们提出了由六六苯并六苯并苯（HBC）组成的一维（1D）纳米石墨烯链的表面合成，HBC是一种常见的纳米石墨烯类型。以二溴取代六苯基苯（Br2-HPB）为前驱体，通过聚合和环化脱氢两个反应步骤在Au（111）表面上获得一维HBC纳米石墨烯链，并通过低温扫描隧道显微镜进行了研究。沉积在 Au(111) 上的 Br2-HPB 分子形成手性选择性自组装层，随后在 200-300 °C 的热退火会诱导 Br2-HPB 脱溴和顺序聚合，从而形成一维 HPB 长链。特别是，我们发现相同长度的 1D HPB 链选择性地并排排列。最后，通过 400 °C 退火，通过长一维链内 HPB 的环化脱氢过程获得 HBC 平面纳米石墨烯。所获得的一维HBC纳米石墨烯链的最大长度达到约30 nm。
Controllable fabrication of low-dimensional graphene structures is a matter of scientific and technological interest. To date, significant efforts have been devoted to the fabrication of nanographene chains as well as nanographenes and graphene nanoribbons. Here, we present the on-surface synthesis of one-dimensional (1D) nanographene chains composed of hexa-peri-hexabenzocoronene (HBC) which is a common type of nanographene. Using dibromo-substituted hexaphenylbenzene (Br2-HPB) as a precursor, the 1D HBC nanographene chains are achieved through two reaction steps, namely polymerization and cyclodehydrogenation, on a Au(111) surface, which have been investigated by low-temperature scanning tunneling microscopy. The Br2-HPB molecules deposited on Au(111) are formed into a chiral selective self-assembled layer, and the following thermal annealing at 200–300 °C induces debromination and sequential polymerization of Br2-HPB, leading to the formation of long 1D HPB chains. In particular, we find that the same length 1D HPB chains are selectively ordered in a side-by-side arrangement. Finally, by annealing at 400 °C, HBC planar nanographenes are achieved through the cyclodehydrogenation process of HPB within the long 1D chains. The maximum length of the obtained 1D HBC nanographene chains reached is about 30 nm.
绘制单一六邻苯并苯低聚物的激发态图。
影响因子：
17.1
作者：
W. Soe;H. S. Wong;C. Manzano;M. Grisolía;M. Hliwa;Xinliang Feng;K. Müllen;C. Joachim
通讯作者：
C. Joachim
影响因子：
38.3
作者：
Chen, Yen-Chia;Cao, Ting;Crommie, Michael F.
通讯作者：
Crommie, Michael F.
影响因子：
15
作者：
Durr, Rebecca A.;Haberer, Danny;Fischer, Felix R.
通讯作者：
Fischer, Felix R.