The 66th JSAP Spring Meeting, 2019

Presentation information

Oral presentation

17 Nanocarbon Technology » 17.2 Graphene

[9p-W521-1~16] 17.2 Graphene

Sat. Mar 9, 2019 1:45 PM - 6:00 PM W521 (W521)

Keiji Ueno(Saitama Univ.), Satoru Suzuki(Univ. of Hyogo)

5:45 PM - 6:00 PM

[9p-W521-16] The formation mechanism from graphene nanoribbon to carbon atomic chain

Xiaobin Zhang1, Manoharan Muruganathan1, Shinya Iwashita1, Marek Schmidt1, Hiroshi Mizuta1,2, Yoshifumi Oshima1 (1.JAIST, 2.Hitachi Cambridge Lab.)

Keywords:graphene nanoribbon, carbon atomic chain, pentaheptite structure

Carbon atomic chains are known to be stably bridged between two graphene terminals. They can be fabricated by electron beam thinning in a transmission electron microscope. However, the fabrication process has not been controlled due to lack of understanding of the formation process. In this study, we successfully observed the thinning process of graphene nanoribbons under low dose irradiation by spherical aberration corrected transmission electron microscope. We found that carbon atomic chains were formed when pentagons and heptagons were generated in very narrow nanoribbon (less than 1 nm in width). And the thinning processes of zigzag and armchair GNRs were found to be different. The density functional theory based molecular dynamics simulations showed that pentaheptite structure was inevitable for formation of carbon atomic chains, which was in agreement with our experimental results. Comparisons between graphene nanoribbons with zigzag and armchair edges demonstrated that the formation of CACs from zigzag GNR is more controllable.