在 Cu(111)表面上通过新的表面合成方法得到 5-扶手椅型石墨烯纳米带。

A new on-surface synthetic pathway to 5-armchair graphene nanoribbons on Cu(111) surfaces.

机构信息

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials &devices, Soochow University, Suzhou 215123, P. R. China.

出版信息

Faraday Discuss. 2017 Oct 26;204:297-305. doi: 10.1039/c7fd00129k.

DOI:10.1039/c7fd00129k

PMID:28787051

Abstract

We report a new pathway to fabricate armchair graphene nanoribbons with five carbon atoms in the cross section (5-AGNRs) on Cu(111) surfaces. Instead of using haloaromatics as precursors, the 5-AGNRs are synthesized via a surface assisted decarboxylation reaction of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA). The on-surface decarboxylation of PTCDA can produce extended copper-perylene chains on Cu(111) that are able to transform into graphene nanoribbons after annealing at higher temperatures (ca. 630 K). Due to the low yield (ca. 20%) of GNRs upon copper extrusion, various gases are introduced to assist the transformation of the copper-perylene chains into the GNRs. Typical reducing gases (H and CO) and oxidizing gas (O) are evaluated for their performance in breaking aryl-Cu bonds. This method enriches on-surface protocols for the synthesis of AGNRs using non-halogen containing precursors.

摘要

我们报告了一种在 Cu(111)表面上制造横截面为五个碳原子的扶手椅型石墨烯纳米带（5-AGNRs）的新途径。该途径不使用卤代芳烃作为前体，而是通过对苯二甲酸酐（PTCDA）的表面辅助脱羧反应合成 5-AGNRs。PTCDA 的表面脱羧可以在 Cu(111)上产生扩展的铜-苝链，这些链在较高温度（约 630 K）退火后能够转化为石墨烯纳米带。由于铜挤压后 GNRs 的产率（约 20%）较低，因此引入了各种气体来辅助铜-苝链转化为 GNRs。典型的还原气体（H 和 CO）和氧化气体（O）被评估了它们在断裂芳基-Cu 键方面的性能。该方法丰富了使用不含卤素的前体合成 AGNRs 的表面方法。