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Keywords:

  • Graphene;
  • Monolayers;
  • Self-assembly;
  • Field-effect transistors;
  • Self-assembled monolayers
Thumbnail image of graphical abstract

Hydrophobic self-assembled monolayers (SAMs) with alkyl chains of various lengths were inserted between CVD-grown graphene layers and their SiO2 substrates (figure). As the SAM alkyl chain length increased, substrate-induced doping was suppressed by the ordered close-packed structure of SAMs with long alkyl chains. Accordingly, graphene transistors constructed on SAMs with long alkyl chains exhibited higher electron/hole mobilities with lower Dirac point voltages.