Growth, Quantitative Growth Analysis, and Applications of Graphene on γ-Al2O3 catalysts.

ABSTRACT: The possibilities offered by catalytic γ-Al2O3 substrates are explored, and the mechanism governing graphene formation thereon is elucidated using both numerical simulations and experiments. The growth scheme offers metal-free synthesis at low temperature, grain-size customization, large-area uniformity of electrical properties, single-step preparation of graphene/dielectric structures, and readily detachable graphene. We quantify based on thermodynamic principles the activation energies associated with graphene nucleation/growth on γ-Al2O3, verifying the low physical and chemical barriers. Importantly, we derive a universal equation governing the adsorption-based synthesis of graphene over a wide range of temperatures in both catalytic and spontaneous growth regimes. Experimental results

SUBMITTER: Park J 

PROVIDER: S-EPMC4490347 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature