▎ 摘　　要

Few layered graphene (FLG) was synthesized by substrate-free floating catalyst chemical vapour deposition method for the first time. A sensor prepared from the pristine FLG coated over a glassy carbon electrode without further modification showed high sensitivity towards sensing of H2O2 (355 mu AmM-1 cm(-2)) with lower detection limit of 0.27 mu M and response time of 5 s. Transmission electron microscopy revealed 3-5 layers of graphene sheets with edge defects, which was supported by Raman spectroscopy. X-ray photoelectron spectroscopy confirmed that the defects are due to oxygen present in the FLG in the form of C = O, that played important role in sensing. (C) 2017 Elsevier B.V. All rights reserved.