Regio- And Steric Effects on Single Molecule Conductance of Phenanthrenes Article

Chen, Y, Huang, M, Zhou, Q et al. (2021). Regio- And Steric Effects on Single Molecule Conductance of Phenanthrenes . NANO LETTERS, 21(24), 10333-10340. 10.1021/acs.nanolett.1c03565

cited authors

  • Chen, Y; Huang, M; Zhou, Q; Li, Z; Meng, J; Pan, M; Ye, X; Liu, T; Chang, S; Xiao, S

authors

abstract

  • Here, six phenanthrene (the smallest arm-chair graphene nanoribbon) derivatives with dithiomethyl substitutions at different positions as the anchoring groups were synthesized. Scanning tunneling microscopy break junction technique was used to measure their single molecule conductances between gold electrodes, which showed a difference as much as 20-fold in the range of ∼10–2.82 G0 to ∼10–4.09 G0 following the trend of G2,7 > G3,6 > G2,6 > G1,7 > G1,6 > G1,8. DFT calculations agree well with this measured trend and indicate that the single molecule conductances are a combination of energy alignment, electronic coupling, and quantum effects. This significant regio- and steric effect on the single molecule conductance of phenanthrene model molecules shows the complexity in the practice of graphene nanoribbons as building blocks for future carbon-based electronics in one hand but also provides good conductance tunability on the other hand.

publication date

  • December 22, 2021

published in

Digital Object Identifier (DOI)

start page

  • 10333

end page

  • 10340

volume

  • 21

issue

  • 24