4.8 Article

Well-defined sub-nanometer graphene ribbons synthesized inside carbon nanotubes

期刊

CARBON
卷 171, 期 -, 页码 221-229

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.08.065

关键词

Graphene nanoribbons; Electronic structure; Raman scattering; Resonance profiles; Albrecht theory; GW calculation

资金

  1. NSFC [51902353]
  2. FWF [P21333-N20]
  3. NKFIH [K-115608]
  4. Natural Science Foundation of Guangdong Province [2019A1515011227]
  5. Sun Yat-Sen University [29000-18841218, 29000-31610028]
  6. NIIF
  7. National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
  8. ELTE Excellence Program [1783-3/2018/FEKUTSTRAT]
  9. Hungarian Ministry of Human Capacities
  10. China Scholarship Council (CSC)
  11. DFG SPP Graphene
  12. DFG
  13. Ministry of Science, Research and the Arts (MWK) of Baden-Wuerttemberg
  14. Fund for Scientific Research Flanders (FWO) [G040011 N, G02112 N, G035918 N, G036618 N, G0F6218 N, 30467715]
  15. DOCPRO4 PhD scholarship from the UAntwerp research fund (BOF)
  16. European Research Council [679841]
  17. Graphene Flagship
  18. European Research Council (ERC) [679841] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

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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