Nano Express
Controlled synthesis of bilayer graphene on nickel
Author affiliations
Department of Electrical and Computer Engineering, University of Iowa, Iowa City, IA, 52242, USA
Citation and License
Nanoscale Research Letters 2012, 7:437 doi:10.1186/1556-276X-7-437
Published: 6 August 2012Abstract
We report a uniform and low-defect synthesis of bilayer graphene on evaporated polycrystalline nickel films. We used atmospheric pressure chemical vapor deposition with ultra-fast substrate cooling after exposure to methane at 1,000°C. The optimized process parameters, i.e., growth time, annealing profile and flow rates of various gases, are reported. By using Raman spectroscopy mapping, the ratio of 2D to G peak intensities (I2D/IG) is in the range of 0.9 to 1.6 over 96% of the 200 μm × 200 μm area. Moreover, the average ratio of D to G peak intensities (ID/IG) is about 0.1.
