Bottom-Up Synthesis of Liquid-Phase-Processable Graphene Nanoribbons with Near-Infrared Absorption
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- 作者：Akimitsu Narita ; Ivan A. Verzhbitskiy ; Wout Frederickx ; Kunal S. Mali ; Soeren Alkaersig Jensen ; Michael Ryan Hansen ; Mischa Bonn ; Steven De Feyter ; Cinzia Casiraghi ; Xinliang Feng ; Klaus M眉llen
- 刊名：ACS Nano
- 出版年：2014
- 出版时间：November 25, 2014
- 年：2014
- 卷：8
- 期：11
- 页码：11622-11630
- 全文大小：669K
- ISSN：1936-086X
文摘
Structurally defined, long (>100 nm), and low-band-gap (鈭?.2 eV) graphene nanoribbons (GNRs) were synthesized through a bottom-up approach, enabling GNRs with a broad absorption spanning into the near-infrared (NIR) region. The chemical identity of GNRs was validated by IR, Raman, solid-state NMR, and UV鈥搗is鈥揘IR absorption spectroscopy. Atomic force microscopy revealed well-ordered self-assembled monolayers of uniform GNRs on a graphite surface upon deposition from the liquid phase. The broad absorption of the low-band-gap GNRs enables their detailed characterization by Raman and time-resolved terahertz photoconductivity spectroscopy with excitation at multiple wavelengths, including the NIR region, which provides further insights into the fundamental physical properties of such graphene nanostructures.