▎ 摘　　要

Graphene has attracted a lot of research Interest owing to its exotic properties-and a wide spectrum of potential applications. Chemical vapor deposition (CVD) from gaseous hydrocarbon sources has shown great promises for large-scale graphene growth. However, high growth temperature, typically 1000 degrees C, is required for such growth. Here we demonstrate a revised CVD route to grow graphene on Cu foils at low temperature, adopting solid and liquid hydrocarbon feedstocks. For solid PMMA and polystyrene precursors, centimeter-scale monolayer graphene films are synthesized at a growth temperature down to 400 degrees C. When benzene is used as the hydrocarbon source, monolayer graphene flakes with excellent quality are achieved at a growth temperature as low as 300 degrees C. The successful low-temperature growth can be qualitatively understood from the first principles calculations. Our work might pave a, way to an undemanding route for economical and convenient graphene growth.