Atomic Hydrogen Promotes Polyparaphenylene Fusion into Graphene Nanoribbons on Au(111).

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Dong Han, Qian Xu, Jun Hu, Honghe Ding, Junfa Zhu
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Abstract

Graphene nanoribbons (GNRs) hold significant potential for applications in semiconductor electronics. Compared to precursor design, the lateral fusion of polymers offers a versatile and flexible approach to producing GNRs with desirable properties. Developing effective methods to enhance lateral fusion is therefore highly desirable. In this study, the beneficial effects of atomic hydrogen (AH) are reported in promoting the lateral fusion of polyparaphenylene (PPP) chains into GNRs on Au(111). When PPP chains are treated with AH at 570 K, the threshold temperature for GNR formation by lateral fusion is reduced to 590 K, a substantial decrease from the 650 K required for the formation of GNR by postannealing without AH. The promoting effect of AH is attributed to the superhydrogenation of PPP chains at 570 K, which 1) locally disrupts π-aromaticity, and 2) facilitates closer proximity of PPP chains. Both effects aid in the dehydrogenative C-C coupling of PPP chains. Scanning tunneling microscopy (STM) and synchrotron radiation photoemission spectroscopy (SRPES) are used to identify reaction products and monitor reaction pathways. The demonstrated role of AH in this study may be extended to other systems involving the lateral fusion of polycyclic aromatic hydrocarbon (PAH)-based polymers.

原子氢促进聚对苯在Au(111)上融合成石墨烯纳米带。
石墨烯纳米带在半导体电子领域具有巨大的应用潜力。与前体设计相比,聚合物的横向融合提供了一种通用和灵活的方法来生产具有理想性能的gnr。因此,开发有效的方法来加强侧位融合是非常必要的。在这项研究中,原子氢(AH)在促进聚对苯二烯(PPP)链侧向融合到Au上的gnr中的有益作用被报道(111)。当PPP链在570 K下用AH处理时,通过侧融合形成GNR的阈值温度降至590 K,大大低于通过不加AH后退火形成GNR所需的650 K。AH的促进作用是由于PPP链在570 K的超氢化作用,1)局部破坏π芳构性,2)使PPP链更接近。这两种效应都有助于PPP链的脱氢C-C偶联。扫描隧道显微镜(STM)和同步辐射光谱学(SRPES)用于鉴定反应产物和监测反应途径。在这项研究中证明的AH的作用可能会扩展到涉及多环芳烃(PAH)基聚合物的横向融合的其他体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Small Methods
Small Methods Materials Science-General Materials Science
CiteScore
17.40
自引率
1.60%
发文量
347
期刊介绍: Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques. With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community. The online ISSN for Small Methods is 2366-9608.
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