Park, Jaehyun Lee, Joohwi Choi, Jung-Hae Hwang, Do Kyung Song, Yong-Won 2024-01-20T06:33:34Z 2024-01-20T06:33:34Z 2021-09-04 2015-07 https://pubs.kist.re.kr/handle/201004/125242 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 support the equation, highlighting the catalytic function of γ-Al2O3 at low temperatures. The synthesized graphene is manually incorporated as a ‘graphene sticker’ into an ultrafast mode-locked laser. English Nature Publishing Group Growth, Quantitative Growth Analysis, and Applications of Graphene on gamma-Al2O3 catalysts Article 10.1038/srep11839 1 Scientific Reports, v.5 Scientific Reports 5 N scie scopus 000357320200001 2-s2.0-84936803921 Multidisciplinary Sciences Science & Technology - Other Topics Article MINIMUM ENERGY PATHS ELASTIC BAND METHOD BILAYER GRAPHENE SADDLE-POINTS GAMMA-ALUMINA SURFACES FILMS CU TRANSPARENT NUCLEATION graphene graphene growth γ-Al2O3 growth mechanism growth equation