Bottom-Up On-Surface Synthesis of Two-Dimensional Graphene Nanoribbon Networks and Their Thermoelectric Properties

Takahiro Kojima, Takahiro Nakae, Zhen Xu, Chinnusamy Saravanan, Kentaro Watanabe, Yoshiaki Nakamura, Hiroshi Sakaguchi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Graphene, the one-atom-thick two-dimensional (2D) carbon material, has attracted tremendous interest in both academia and industry due to its outstanding electrical, mechanical, and thermal properties. For electronic applications, the challenging task is to make it as a semiconductor. The bottom-up synthesis of semiconducting one-dimensional (1D) nanometer-wide graphene strips, namely, graphene nanoribbons (GNRs), has attracted much attention owing to its promising electronic, optical, and magnetic properties. In this regard, we report the fabrication of cove-type 2D GNR networks (GNNs) via the interconnection of 1D self-assembled GNRs on the surface of Au(111). The cove-type 2D GNRs networks (GNNs) were fabricated from the GNR, 5-CGNR-1-1, synthesized using the precursor of DBSP. Annealing of high-density self-assembled GNRs on the surface of Au(111) through two-zone chemical vapour deposition (2Z CVD) successfully generated a 2D interconnected structure with high yield via the fusion and ladder coupling reactions of GNR chains. In order to validate the later fusion reaction, we have also synthesized the GNR, 7-AGNR-1-1, using the precursor of DBBA. The GNNs, which consist of hybridized metallic-like and semiconducting GNRs, are a new class of carbon-based materials. Further, we applied this material for thermoelectric (TE) applications and found a very low cross-plane thermal conductivity of 0.11 Wm−1 K−1, which is one of the lowest value among the carbon-based materials as well as inorganic semiconductors, while maintaining the cross-plane electrical conductivity of 188 S m−1.

Original languageEnglish
Pages (from-to)4400-4407
Number of pages8
JournalChemistry - An Asian Journal
Issue number23
Publication statusPublished - 2019 Dec 2
Externally publishedYes


  • 2D graphene nanoribbon networks
  • 2D materials
  • chemical vapour deposition
  • graphene nanoribbons
  • thermoelectric

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry


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