N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility** |
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Authors: | Dr Xuelin Yao Dr Heng Zhang Fanmiao Kong Dr Antoine Hinaut Dr Rémy Pawlak Prof?Dr Masanari Okuno Dr Robert Graf Dr Peter N Horton Prof?Dr Simon J Coles Prof?Dr Ernst Meyer Prof?Dr Lapo Bogani Prof?Dr Mischa Bonn Prof?Dr Hai I Wang Prof?Dr Klaus Müllen Prof?Dr Akimitsu Narita |
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Institution: | 1. Max Planck Institute for Polymer Research, Ackermannweg10, 55128 Mainz, Germany;2. Department of Materials, University of Oxford, OX1?3PH Oxford, United Kingdom;3. Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland;4. Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, 153-8902 Tokyo, Japan;5. National Crystallography Service, School of Chemistry, University of Southampton, SO17?1BJ Southampton, United Kingdom |
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Abstract: | Structurally defined graphene nanoribbons (GNRs) have emerged as promising candidates for nanoelectronic devices. Low band gap (<1 eV) GNRs are particularly important when considering the Schottky barrier in device performance. Here, we demonstrate the first solution synthesis of 8-AGNRs through a carefully designed arylated polynaphthalene precursor. The efficiency of the oxidative cyclodehydrogenation of the tailor-made polymer precursor into 8-AGNRs was validated by FT-IR, Raman, and UV/Vis-near-infrared (NIR) absorption spectroscopy, and further supported by the synthesis of naphtho1,2,3,4-ghi]perylene derivatives ( 1 and 2 ) as subunits of 8-AGNR , with a width of 0.86 nm as suggested by the X-ray single crystal analysis. Low-temperature scanning tunneling microscopy (STM) and solid-state NMR analyses provided further structural support for 8-AGNR . The resulting 8-AGNR exhibited a remarkable NIR absorption extending up to ~2400 nm, corresponding to an optical band gap as low as ~0.52 eV. Moreover, optical-pump TeraHertz-probe spectroscopy revealed charge-carrier mobility in the dc limit of ~270 cm2 V?1 s?1 for the 8-AGNR . |
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Keywords: | Carbon Materials Graphene Nanoribbons High Charge Carrier Mobility Low Bandgap Time-Resolved Spectroscopy |
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