▎ 摘　　要

NOVELTY - Preparation of graphene involves contacting precursor compound with a substrate and heating the substrate. USE - Preparation of graphene e.g. single layer, bilayer and multilayer graphene (claimed). ADVANTAGE - The method enables preparation of graphene with high quality and is economical. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) defect-free single layer graphene exhibiting no D peaks/bands in Raman spectra; and (2) process for enhancing I2d/Ig ratio of graphene, which involves subjecting the prepared graphene to Joule heating.