▎ 摘　　要

A photon-initiated chemical route for hydroxylation of CVD graphene and exfoliated graphene is presented. Hydroxyl functionalities have been bonded covalently to exfoliated and CVD graphene by treating the graphene with H2O2 in the presence of UV light. Back-gated graphene field effect transistors fabricated from hydroxyl functionalized graphene shows p-type doping and mobility in the range of 1000 cm(2) V-1 s(-1) which is much higher than reported in graphene oxide and reduced graphene oxide. Vacuum stability of hydroxyl functional groups is demonstrated by keeping hydroxyl functionalized graphene in vacuum for 22 h and comparing the electrical characteristics. As a further proof of -OH functionalization, we demonstrate the deposition of Al2O3 by atomic layer deposition, which is not possible on pristine graphene. (C) 2019 Elsevier Ltd. All rights reserved.