▎ 摘　　要

We report an atomically-thin passivation layer composed of a self-assembled alkane monolayer, that protects graphene from outside dopants and external contamination while retaining its transparency, flexibility and su-perior electron transfer ability. These advantages allowed successful fabrication of passivated graphene field-effect transistors (G-FETs) on a plastic substrate with ion-gel gate dielectrics for transparent and flexible elec-tronics. This highly transparent, flexible, and ultra-thin organic passivation layer has many possible applications in electronics that use graphene.