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Self-assembly of trimetallic nitride template fullerenes on surfaces studied by STM |
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| Authors: | DF Leigh D Cattaneo K Porfyrakis A Ardavan |
| Institution: | a Swansea University, Multidisciplinary Nanotechnology Centre, School of Engineering, Singleton Park, Swansea SA2 8PP, UK b University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, UK c NEMAS - Center for NanoEngineered MAterials and Surfaces, CNISM and Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Via Ponzio 34/3, 20133 Milano, Italy d International Centre for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1 Nanmiki, Tsukuba, Ibaraki 305-0044, Japan e University of Oxford, Department of Physics, Parks Road, Oxford OX1 3PU, UK |
| Abstract: | Trimetallic nitride template fullerenes have been deposited onto a variety of substrates in order to elucidate the substrate-fullerene interactions. We have investigated self-assembled island formation and molecular detail of Er3N@C80 and Sc3N@C80 on Ag/Si(1 1 1), Au(1 1 1)/mica, Si(1 1 1), and Si(0 0 1) using variable temperature scanning tunnelling microscopy (STM). At room temperature, the fullerenes self-assemble into monolayer-high hexagonal close-packed islands on Ag-passivated Si(1 1 1) whereas annealing at elevated temperatures (250-300 °C) is necessary for the self-assembly of close-packed islands on Au(1 1 1). Intra-molecular resolution of the fullerenes has been achieved at liquid nitrogen temperature on Ag/Si(1 1 1) and already at room temperature on Si(0 0 1), when the rotation of the fullerenes is frozen. Whereas the bonding between the fullerenes and Si surfaces is mainly covalent, it appears to be mainly van-der-Waals on the other surfaces. |
| Keywords: | Fullerenes Endohedral metallofullerenes Adsorption Surface diffusion Self-assembly In situ characterization Scanning tunnelling microscopy |
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