Abstract
Engineering sp2 carbon nanostructures with electrons
Mark H. Rümmeli
IFW Dresden, Helmholtzstrasse 20, Dresden, Germany
Email: m.ruemmeli@ifw-dresden.de
The Molecular Nanostructures group at the IFW conducts research on the synthesis of sp2 carbon nanostructures and other materials (e.g. Si, B, SiC, FexOy, Fe etc). Particular focus is placed on understanding the growth and functionalization mechanisms of these nanostructures. In addition, their potential for biomedical exploitation is investigated. We are also developing the use of electrons to structure, modify and grow nanostructures. The field can be classified into two primary categories, namely, current induced engineering and electron beam induced engineering. Both routes are highly versatile and afford the opportunity to cut/erode sp2 carbon, heal defects, and for catalyst-free fabrication of graphene from amorphous carbon. In this presentation in-situ transmission electron microscopy (TEM) studies exploring both current induced and electron beam engineering are presented. For the current induced studies graphene flakes suspended across electrodes are investigated at high bias. The studies provide a rich variety of phenomena that provide important insights into how one can shape or modify graphene by Joule heating. Examples include the peeling off of multilayered suspended graphene sheets layer by layer, the controlled cracking of graphene to nanoribbons as narrow as 1 nm which sustain currents as high as 6 x 109 A cm-2 and the merging of overlapping pieces of graphene. In addition, deposited amorphous carbon on suspended graphene at high bias is shown to graphitize.
The use of an electron beam (from the TEM itself) is also shown to offer a plethora of engineering possibilities including, nano-chemistry inside single walled carbon nanotubes, catalyst free graphene fabrication, and sp2 carbon nanostructuring. The experimental work is supported by image simulation data and molecular dynamics simulations.
PERSONAL DATA
Place of work and address:
Leibniz Institute for Solid State
and Materials Research, IFW, Dresden
Helmholtzstrasse 20,
01069 Dresden, Germany
Telephone: 0049 351 4659 510
E-mail: m.ruemmeli@ifw-dresden.de
Citizenship: Swiss/British
Date and place of birth: October 16th 1967, Blantyre, Malawi
EXPERIENCE
Total number of articles: 177
Total citations - 1686, h-index – 22 (Reuters Web of Knowledge)
2003 to present: Marie Curie Fellow/DFG Fellow/Group Leader ’’Molecular Nanostructures’’, Leibniz Institute for Solid State and Materials Research, IFW, Dresden, Germany
2000 to 2003: Consultant, Learning System Development, Efixis Limited. U.K.
2001 to 2002: Crew-member, Sailing Yacht Sensation – Mediterranean & Trans-Atlantic crossing
1999 to 2001: Post-Doctoral TMR Fellow, Institute of Space Sensor Technology and Planetary Exploration, DLR, German Aerospace Centre, Berlin, Germany
1999: Computer Engineer, Computer Services, Antigua, West Indies
1998 to 1999: Consultant of Learning Systems, St. John’s University, School of Medicine, Montserrat, West Indies (Now: The College of Medicine, St. Lucia)
1998: Educational Multimedia Consultant, Translator and Developer, Interactive Technology Group, Eugene, Oregon, U.S.A.
1997 to 1998: Associate Director of Academic and Students Affairs, The University of Health Sciences, Antigua
1991 to 1994: Lecturer in B.Sc. and BTEC Sciences, The University of North London, London, England
1986 to 1987: Assistant Manager, Access Cars, Sussex, England
HIGHER EDUCATION AND QUALIFICATIONS
2004: Chartered Scientist, Institute of Physics, London, England
2003: Registered European Physicist, European Physical Society, The Netherlands
2002: Chartered Physicist, Institute of Physics, London, England
1991 to 1996: Ph.D. in Plasma Physics and Analytical Atomic Spectroscopy, The University of North London, London, England
1994: Certificate in Data Communication Systems, The University of North London, London, England
1993: Post-Graduate School ’’Scientists in Industry and Commerce’’, Durham University, Durham UK
1988 to 1991: B.Sc. 1st. class honors in Physics and Computer Electronics, The Polytechnic of North London, London, England
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