Bottom-Up Fabrication of Graphene-related Materials
Event details
| Date | 03.10.2014 |
| Hour | 14:15 |
| Speaker |
Prof. Roman Fasel, Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, 8600 Dübendorf, Switzerland Bio: Roman Fasel received his Ph.D. in Physics in 1996 from the University of Fribourg (Switzerland) and joined EMPA, the Swiss Federal Laboratories for Materials Science and Technology, after post-doctoral research fellowships at La Trobe University (Melbourne) and the Fritz-Haber-Institute (Berlin). He is currently the head of the nanotech@surfaces Laboratory of EMPA, and since 2008 Tit. Professor at the Department of Chemistry and Biochemistry of the University of Bern. RF has a strong background in experimental surface physics and chemistry, and follows an experimental approach building on state-of-the-art scanning probe methods (UHV temperature-controlled STM/STS) combined with structural and spectroscopic methods based on x-ray photoelectron emission (XPS, UPS, XPD). His group’s research covers a wide range of topics at the interface of materials science, surface physics and chemistry, with the aim of understanding molecular processes at surfaces at a molecular and atomic level. RF has obtained several Research Fellowships of e.g. the Swiss National Science Foundation, the Alexander-von-Humboldt-Stiftung and the Max-Planck-Gesellschaft. Recipient of several awards, e.g. Thürler-Reeb Prize and ICSOS Young Scientist Prize. Member of the Swiss National Center of Competence in Research (NCCR) Nanoscale Science, Board member of the IUVSTA Surface Science Division Committee. He has given numerous invited talks at international conferences and at research institutions and universities world-wide, and has published more than 100 papers in international journals. |
| Location | |
| Category | Conferences - Seminars |
From Molecules to Nanoribbons and Nanotubes
The properties of single-walled carbon nanotubes (SWCNT) and graphene nanoribbons (GNR) depend sensitively on the details of their atomic structure. For the case of SWCNTs, electronic and optical properties are directly related to the chiral index (n,m) that denotes the length and orientation of the circumferential vector in the hexagonal carbon lattice. For GNRs, the electronic states largely depend on nanoribbon width and edge structure (armchair or zigzag). Monodisperse “single-chirality” SWCNTs and atomically precise GNRs are thus needed to fully exploit the technological potential of these materials.
In a first part of this presentation, I will review a recently developed bottom-up approach to the fabrication of atomically precise GNRs [1]. It is based on a surface-assisted synthetic route using specifically designed precursor monomers, and has made available ultra-narrow GNRs and related graphene nanostructures for experimental investigations of their structural, electronic and optical properties [1-5]. In a second part, I will report on a closely related bottom-up strategy targeting the controlled synthesis of single-chirality SWCNTs [6].
References:
[1] J. Cai et al., Nature 466, 470 (2010).
[2] P. Ruffieux et al., ACS Nano, 6, 6930 (2012).
[3] L. Talirz et al., J. Am. Chem. Soc. 135, 2060 (2013) ; H. Söde et al., submitted.
[4] R. Denk et al., Nat. Commun. 5, 4253 (2014).
[5] J. Cai et al., Nat. Nanotechnol. (2014) ; doi:10.1038/nnano.2014.184.
[6] J.R. Sanchez et al., Nature 512, 61 (2014).
The properties of single-walled carbon nanotubes (SWCNT) and graphene nanoribbons (GNR) depend sensitively on the details of their atomic structure. For the case of SWCNTs, electronic and optical properties are directly related to the chiral index (n,m) that denotes the length and orientation of the circumferential vector in the hexagonal carbon lattice. For GNRs, the electronic states largely depend on nanoribbon width and edge structure (armchair or zigzag). Monodisperse “single-chirality” SWCNTs and atomically precise GNRs are thus needed to fully exploit the technological potential of these materials.
In a first part of this presentation, I will review a recently developed bottom-up approach to the fabrication of atomically precise GNRs [1]. It is based on a surface-assisted synthetic route using specifically designed precursor monomers, and has made available ultra-narrow GNRs and related graphene nanostructures for experimental investigations of their structural, electronic and optical properties [1-5]. In a second part, I will report on a closely related bottom-up strategy targeting the controlled synthesis of single-chirality SWCNTs [6].
References:
[1] J. Cai et al., Nature 466, 470 (2010).
[2] P. Ruffieux et al., ACS Nano, 6, 6930 (2012).
[3] L. Talirz et al., J. Am. Chem. Soc. 135, 2060 (2013) ; H. Söde et al., submitted.
[4] R. Denk et al., Nat. Commun. 5, 4253 (2014).
[5] J. Cai et al., Nat. Nanotechnol. (2014) ; doi:10.1038/nnano.2014.184.
[6] J.R. Sanchez et al., Nature 512, 61 (2014).
Practical information
- Informed public
- Free
Organizer
- ICMP
Contact
- Arnaud Magrez ([email protected])