R. Krupke

Prof. Dr. Ralph Krupke

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Academic education and degrees

  • 1996 – 1999 PhD in Physics, Tel Aviv University, 1999, Prof. Guy Deutscher
  • 1989 – 1995 Diplom-Physik, Universität Karlsruhe, 1995, Prof. Hermann Rietschel and Dr. Jochen Geerk

Career since final degree

  • since 2013    Research Unit Chair, Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT)
  • since 2011    Professor of Molecular Nanostructures, TU Darmstadt
  • 2005 – 2010 Helmholtz-University-Young-Investigator-Group "Electronic and optical properties of molecular nanostructures", Institute of Nanotechnology, KIT
  • 2000 – 2004 Postdoctoral Researcher at Forschungszentrum Karlsruhe

Research interest and key experience

  • Charge transport and light-matter interaction in carbon nanosystems, 2D materials and molecular nanostructures for optoelectronics, photonics, high-frequency electronics and sensing applications
  • Fabrication of functional devices; synthesis, sorting and assembling/integration of nanomaterials
  • Experimental techniques: Dispersive and Fourier-transform photocurrent spectroscopy and imaging, electroluminescence spectroscopy and imaging, Raman spectroscopy and imaging, FTIR microscopy, semiconductor parameter analysis, electron transport, low temperature experiments, electron microscopy, electron-beam lithography, nanofabrication, dielectrophoresis.
  • 80 publications in international journals with over 4000 citations, two book chapters, 5 patents, 52 invited talks, H-factor 28 (Web of Science).

Selected publications (complete list at www.int.kit.edu/1245.php)

  • Fully integrated quantum photonic circuit with an electrically driven light source
    Khasminskaya S, Pyatkov F, Słowik K, Ferrari S, Kahl O, Kovalyuk V, Rath P, Vetter A, Hennrich F, Kappes MM, Gol’tsman G, Korneev A, Rockstuhl C, Krupke R, Pernice WHP
    Nature Photonics 10
    (2016)727–732, 10.1038/nphoton.2016.178
  • Cavity-enhanced light emission from electrically driven carbon nanotubes
    Fütterling F, Khasminskaya S, Flavel BS, Hennrich F, Kappes M, Krupke R, Pernice WHP
    Nature Photonics 10
    (2016) 420–427, 10.1038/nphoton.2016.70
  • Waveguide-Integrated Light-Emitting Carbon Nanotubes
    Khasminskaya S, Pyatkov F, Flavel BS, Pernice WHP, Krupke R
    Advanced Materials 26
    (2014)3465-3472, 10.1002/adma.201305634
  • Catalytic subsurface etching of nanoscale channels in graphite
    M. Lukas, V. Meded, A. Vijayaraghavan, L. Song, P. M. Ajayan, K. Fink, W. Wenzel, R. Krupke
    Nature Communications 4
    (2013) 1379, 10.1038/ncomms2399
  • Probing the Nature of Defects in Graphene by Raman Spectroscopy
    Eckmann A, Felten A, Mishchenko A, Britnell L, Krupke R, Novoselov KS, Casiraghi C.
    Nano Letters 12
    (2012) 3925-3930, 10.1021/nl300901a
  • Light–matter interaction in a microcavity-controlled graphene transistor
    M. Engel, M. Steiner, A. Lombardo, A.C. Ferrari, H.v. Löhneysen, P. Avouris, R. Krupke
    Nature Communications 3
    (2012) 906, 10.1038/ncomms1911
  • Electroluminescence from a single nanotube-molecule-nanotube junction
    C.W. Marquardt, S. Grunder, A. Blaszczyk, S. Dehm, F. Hennrich, H.v. Löhneysen, M. Mayor, R. Krupke
    Nature Nanotechnology 5
    (2010) 863–867, 10.1038/nnano.2010.230
  • Ultra-Large-Scale Directed Assembly of Single-Walled Carbon Nanotube Devices
    A. Vijayaraghavan, S. Blatt, D. Weissenberger, M. Oron-Carl, F. Hennrich, D. Gerthsen, H. Hahn, R. Krupke
    Nano Lett.
    7 (2007) 1556-1560, 10.1021/nl0703727
  • Separation of metallic from semiconducting single-walled carbon nanotubes
    R. Krupke, F. Hennrich, H. v. Löhneysen, M. M. Kappes
    301 (2003) 344-347; 10.1126/science.1086534


  • US 8987705 B2, Carbon Nanotube Transistor Employing Embedded Electrodes, 24 Mar 2015.
  • US 8859439 B1, Solution-assisted carbon nanotube placement with graphene electrodes, 14 Oct 2014.
  • US 8610989 B2, Optoelectronic device employing a microcavity including a two-dimensional carbon lattice structure, 17 Dec 2013.
  • EP 2362216 A1, Carbon nanotube SB-FET hydrogen sensor and methods for its manufacture and operation, 31 Aug 2011.
  • US 7161107 B2, Method, arrangement and use of an arrangement for separating metallic carbon nanotubes from semi-conducting carbon nanotubes, 7 Jan 2007.


  • 2012  IBM Pat Goldberg Memorial Award
  • 2004  Erwin-Schrödinger-Award
  • 2005  Helmholtz-Young-Investigator Award

Supervision and hosting of graduate students and postdoctoral fellows

  • PhD students: 18, PostDocs: 9, Master/Bachelor students: 21, DAAD fellows: 2
  • Alexander-von-Humboldt fellows Dr. A. Vijayaraghavan, Dr. B.S. Flavel, Dr. A. Felten
  • Emmy-Noether-Group Dr. B.S. Flavel

Teaching activities and examinations

  • since 2011 At TU Darmstadt: Carbon Nanotubes and Graphene – from fundamentals to applications, evaluated lecture; Characterization methods of materials science; evaluated seminar Examination and evaluation of dissertations and theses at TU Darmstadt and KIT
  • 2005 – 2010 At KIT:             Superconductivity; Magnetism; Carbon Nanotubes and Graphene; Base quantities and base units; shared seminars. Magnetism and highly correlated electron systems; shared lecture

Miscancellous professional activities

  • Reviewer of journals: Science, Nature, Nature Nanotechnology, Nature Communications, Nature Methods, Advanced Materials, ACS Nano, Nano Letters, Scientific Reports, Angewandte Chemie, Langmuir, Applied Physics Letters
  • Reviewer of funding agencies: European Research Council (ERC), German Science Foundation (DFG)
  • Spokes person of the subtopic carbon nanosystems of the Helmholtz program Science and Technology of Nanosystems (STN), since 2015
  • Advisory board member of the International Conference on the Science and Application of Nanotubes, since 2015
  • Member of the GDR-I Graphene and Nanotubes network, since 2015
  • Editor for the Journal of Nanomaterials, since 2013
  • Participant of the Helmholtz Management Academy Program, 2009
  • Participant of the Junior Professional Management Program organized by the Zentrum für Wissenschaftsmanagement Speyer e.V. and sponsored by the BASF, 2007 – 2008
  • Material Research Society Spring Meeting Symposium “Science and Applications of Carbon Nanotubes Symposium”, co-organizer 2005

Third party funding

  • Piezoresistivity in nanocrystalline graphene, DFG, 283k€, 2017 - 2019
  • Tailoring supercurrent confinement in tunable superconducting weak links, DFG, 210k€, 2016 - 2018
  • Synthesis and Enrichment of Single-Chirality Carbon Nanotubes for Device Applications, BMBF, 12k€, 2015 - 2016
  • Waveguide integrated nanotube light sources, Volkswagen Foundation, 512k€, 2014 - 2017
  • Fourier-Transform Photocurrent-Spectromicroscope with Supercontinuum light source, DFG+State of Hesse, 249k€, 2012
  • Probing Electronic States in Dye Molecules by Scanning Tunnelling Microscopy and Carbon Nanotube Junctions, DFG, 126k€, 2010 - 2013
  • Controlling electron transport in carbon nanotubes with an optical microresonator cavity”, DFG, 126k€, 2008 - 2011
  • Electronic and optical properties of molecular nanostructures, Helmholtz Association, 1,25M€, 2005 - 2010

Media (since 2010)

  • KIT press release 132/2016 - Erster quantenphotonischer Schaltkreis mit elektrischer Lichtquelle
  • KIT press release 059/2016 - Nature Photonics: Light Source for Quicker Computer Chips
  • Neues aus der TU Darmstadt 19.04.2016 - Lichtquelle für schnellere Chips
  • Frankfurter Allgemeine Zeitung 05.03.2013 – Nanotechnik: Kein Tunnel der Welt ist kleiner
  • KIT press release 013/2013 - Nature Communications – Nanoparticles Digging the World’s Smallest Tunnels
  • KIT press release 103/2012 - Play of Colors with Graphene
  • Frankfurter Allgemeine Zeitung 02.01.2011 - Eine Taschenlampe aus wenigen Molekülen
  • KIT press release 149/2010 - A Molecular Torch