Journal
CARBON
Volume 171, Issue -, Pages 221-229Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.08.065
Keywords
Graphene nanoribbons; Electronic structure; Raman scattering; Resonance profiles; Albrecht theory; GW calculation
Funding
- NSFC [51902353]
- FWF [P21333-N20]
- NKFIH [K-115608]
- Natural Science Foundation of Guangdong Province [2019A1515011227]
- Sun Yat-Sen University [29000-18841218, 29000-31610028]
- NIIF
- National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
- ELTE Excellence Program [1783-3/2018/FEKUTSTRAT]
- Hungarian Ministry of Human Capacities
- China Scholarship Council (CSC)
- DFG SPP Graphene
- DFG
- Ministry of Science, Research and the Arts (MWK) of Baden-Wuerttemberg
- Fund for Scientific Research Flanders (FWO) [G040011 N, G02112 N, G035918 N, G036618 N, G0F6218 N, 30467715]
- DOCPRO4 PhD scholarship from the UAntwerp research fund (BOF)
- European Research Council [679841]
- Graphene Flagship
- European Research Council (ERC) [679841] Funding Source: European Research Council (ERC)
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This study demonstrates a method for synthesizing 6- and 7-armchair graphene nanoribbons with widths of 0.61 and 0.74 nm and excitonic gaps of 1.83 and 2.18 eV by high-temperature vacuum annealing of ferrocene molecules inside single-walled carbon nanotubes. The growth process is confirmed by atomic resolution electron microscopy, while the structure is identified through Raman scattering characterization and quantum-chemical calculations.
Graphene nanoribbons with sub-nanometer widths are extremely interesting for nanoscale electronics and devices as they combine the unusual transport properties of graphene with the opening of a band gap due to quantum confinement in the lateral dimension. Strong research efforts are presently paid to grow such nanoribbons. Here we show the synthesis of 6- and 7-armchair graphene nanoribbons, with widths of 0.61 and 0.74 nm, and excitonic gaps of 1.83 and 2.18 eV, by high-temperature vacuum annealing of ferrocene molecules inside single-walled carbon nanotubes. The growth of the so-obtained graphene nanoribbons is evidenced from atomic resolution electron microscopy, while their well-defined structure is identified by a combination of an extensive wavelength-dependent Raman scattering characterization and quantum-chemical calculations. These findings enable a facile and scalable approach leading to the controlled growth and detailed analysis of well-defined sub-nanometer graphene nanoribbons. (C) 2020 Elsevier Ltd. All rights reserved.
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