Poly(ethylene oxide) Functionalized Graphene Nanoribbons with Excellent Solution Processability

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• 作者：Yinjuan Huang ; Yiyong Mai ; Uliana Beser ; Joan Teyssandier ; Gangamallaiah Velpula ; Hans van Gorp ; Lasse Arnt Straasø ; Michael Ryan Hansen ; Daniele Rizzo ; Cinzia Casiraghi ; Rong Yang ; Guangyu Zhang ; Dongqing Wu ; Fan Zhang ; Deyue Yan ; Steven De Feyter ; Klaus Müllen ; Xinliang Feng
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：138
• 期：32
• 页码：10136-10139
• 全文大小：305K
• 年卷期：0
• ISSN：1520-5126

文摘

Structurally well-defined graphene nanoribbons (GNRs) have attracted great interest as next-generation semiconductor materials. The functionalization of GNRs with polymeric side chains, which can widely broaden GNR-related studies on physiochemical properties and potential applications, has remained unexplored. Here, we demonstrate the bottom-up solution synthesis of defect-free GNRs grafted with flexible poly(ethylene oxide) (PEO) chains. The GNR backbones possess an armchair edge structure with a width of 1.0–1.7 nm and mean lengths of 15–60 nm, enabling near-infrared absorption and a low bandgap of 1.3 eV. Remarkably, the PEO grafting renders the GNRs superb dispersibility in common organic solvents, with a record concentration of ∼1 mg mL^–1 (for GNR backbone) that is much higher than that (<0.01 mg mL^–1) of reported GNRs. Moreover, the PEO-functionalized GNRs can be readily dispersed in water, accompanying with supramolecular helical nanowire formation. Scanning probe microscopy reveals raft-like self-assembled monolayers of uniform GNRs on graphite substrates. Thin-film-based field-effect transistors (FETs) of the GNRs exhibit a high carrier mobility of ∼0.3 cm² V^–1 s^–1, manifesting promising application of the polymer-functionalized GNRs in electronic devices.