Rapid flame synthesis of multilayer graphene on SiO2/Si substrate

We report an approach to synthesize transfer-free multilayer graphene films rapidly on SiO2/Si substrates by ethanol/H-2 flame in only 2 min. The ethanol/H-2 flame not only serves as a heat source and carbon source, but also provides protection atmosphere during the growth process. Raman spectra and TEM analysis show carbon atoms segregate to the Ni/SiO2 interface are demonstrated to be multilayer graphene, while the carbon films form on top of the Ni layer are graphite layer. The graphene films synthesized on quartz substrate after Ni etching exhibits transmittance of up to 81 % at 550 nm and sheet resistance in the range from 1120 to 1540 Omega sq(-1).