K1. Graphene has been conjugated with Silicene which is a 2D nanosheet of silicon crystal to analyze myriad physico-chemical properties. We seek to understand how diffusion modifies ourĮxperimental results. A simple model where graphene is bonded with a metal surface shows that the results are generic for covalently bonded graphene, and the minimum attainable edge contact resistance is twice the ideal edge quantum contact resistance of graphene. Our radiative efficiency measurementsĭepend strongly on laser focusing, suggesting that diffusion is of the contact area between nickel and graphene, and in excellent agreement with recent experimental data. But ourĭefect-related recombination model is incomplete because it does Levels near and far from the isolated defect. These results, we model the distribution of defect-related energy Radiative efficiency on excitation power is dramatically Onto one of these defective regions, the dependence of the Images of the emitted light reveal isolated dark regions where Laser power to investigate defect-related recombination in GaAs. Ratio of emitted to incident light) as a function of excitation The Deutsche Physikalische Gesellschaft (DPG) with a tradition extending back to 1845 is the largest physical society in the world with more than 61,000 members. The chemical interaction between graphene and nickel is due to hybridization of the metal d-electrons with the -orbitals of graphene. K1.00002: How does diffusion affect radiative efficiency measurements?Ĭaroline Vaughan, Tim Gfroerer, Mark Wanlassĭefect-related recombination can lower the efficiency of many Graphene on nickel is a prototypical example of an interface between graphene and a strongly interacting metal, as well as a special case of a lattice matched system. K1.00001: UNDERGRADUATE RESEARCH (Including Society of Physics Students) As an example, the passive graphene layer formed on the nickel surface can protect the underneath spin-polarized electrons against surface adsorptions and chemical oxidation 6, 7. ImagineNano was one of the largest European events in Nanoscience & Nanotechnology that took place from 11th to 14th. This is caused by an attractive interaction of the graphene flake with the Ni dislocations when the dislocations arrive at the Ni-graphene interface they induce height depressions of the flake that alleviate the pressure in the top Ni layer and weaken the force on the indenter.Session K1: Poster Session II (2:00 pm - 5:00 pm) (a) Shows the starting structure of graphene inside the nickel before relaxation (only 6 layers of nickel out of 48 are shown), (b) shows the Ni(111) graphene interface moving at fixed interfacial distance (2 ), (c) shows the name of different graphene structures depending on the placement of graphene over nickel atoms, (d) is the case when. Imaginenano Abstract Booklet (Poster Contributions) Published on Apr 10, 2011. The composite material has a smaller hardness than pure Ni. In this case, interface cracks between Ni and graphene are created. If the indenter touches the flake, dislocations are nucleated in the Ni layer beyond the flake. However, they can bend around the flake and thus reach positions below it. We find that the dislocations generated by the indentation in the vicinity of the indenter never penetrate the graphene flake. A systematic study is presented by positioning the graphene flake at various depths below the Ni surface and also terminating it at various lateral distances from the indent point. The processes occurring during nanoindentation of graphene-reinforced Ni substrates are studied using molecular dynamics simulation.