Stephen K. Doorn

Science Partner Leader, Center for Integrated Nanotechnologies
Science Thrust: Nanophotonics and Optical Nanomaterials

Phone: 505-667-2541
Fax: 505-665-9030
skdoorn@lanl.gov

MPA-CINT, MS K771
Los Alamos National Laboratory
Los Alamos, NM 87545


 

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Education and Training

Undergraduate: University of Wisconsin, Chemistry, B.S. 1985
Graduate: Northwestern, Physical Chemistry, M.S. 1986
Graduate: Northwestern, Physical Chemistry, Ph.D. 1990

Research

Steve‚Äôs research interests are in spectroscopic characterization of nanomaterials with a current focus on studies of carbon nanomaterials including carbon nanotubes, graphene, and graphene oxide.  Current efforts include spectroscopic investigation of fundamental electronic structure and optical properties using Raman and photoluminescence spectroscopy at the ensemble and single-tube levels.  Interests also include controlling nanotube optical properties via covalent and noncovalent functionalization chemistry.  Efforts include tailoring and probing the nanotube surface environment and using that environment to engineer multi-component interactions.  Single-tube and single-site spectroscopy and imaging serve as probes of the interplay between excitons in the 1-D surface environment with 0-D dopant sites to generate new optical states.   Surface control also provides a route to enhance nanotube separations and for modulating energy and charge flow towards applications in sensing and energy harvesting.  Interests also include development of surface enhance Raman (SERS) active nanoparticle tags for flow-based approaches to bioanalytical problems.

Selected Publications

  • Mechanism of Electrolyte Induced Brightening of Single-Wall Carbon Nanotubes, J.G. Duque, L. Oudjedi, J.J. Crochet, S. Tretiak, B. Lounis, B.; S.K. Doorn, L. Cognet,  J. Am. Chem. Soc., 135, 3379 (2013).
  •  Disorder Limited Exciton Transport in Colloidal Single-Wall Carbon Nanotubes, J.J. Crochet, J.G. Duque, J.H. Werner, B. Lounis, L. Cognet, S.K. Doorn, Nano Letters, 12, 5091 (2012). 
  •  Quantum Interference Between the Third and Fourth Excitonic States in Semiconducting Carbon Nanotubes Using Resonance Raman Spectroscopy ,J.G. Duque, H. Telg, H. Chen, A.K. Swan, A.P. Shreve, X. Tu, M. Zheng, S.K. Doorn, Phys. Rev. Lett., 108, 117404 (2012).
  •  Photoluminescence Imaging of Localized and Delocalized Electronic Defects in Single-Wall Carbon Nanotubes, J.J. Crochet, J.G. Duque, J.H. Werner, S.K. Doorn, Nature Nanotech., 7, 126 (2012). 
  • Fluorescent Single-Walled Carbon Nanotube Aerogels in Surfactant-Free Environments, J.G. Duque, C.E. Hamilton, G. Gupta, S.A. Crooker, J.J. Crochet, A. Mohite, H. Htoon, K.A. Defriend Obrey, A.M. Dattlebaum, S.K. Doorn, ACS Nano, 5, 6686 (2011).
  •  Violation of the Condon Approximation in Semiconducting Carbon Nanotubes, J.G. Duque, H. Chen, A.K. Swan, A.P. Shreve, S. Kilina, S. Tretiak, X. Tu, M. Zheng, S.K. Doorn, S.K., ACS Nano, 5, 5233 (2011).

Selected User Projects

  • Studies of Exciton-Phonon Coupling Behavior in Armchair Single-Walled Carbon Nanotubes and Double-Walled Carbon Nanotubes Using Raman Scattering Excitation Profiles, Junichiro Kono, Rice University
  • Photoluminescence Properties and Temporal Dynamics of the Excitons in Suspended Carbon Nanotubes, Laurent Cognet, University of Bordeaux
  • Designing the Functionality of Single-Wall Carbon Nanotube-Silica Aerogels, Juan Duque, Los Alamos National Laboratory
  • Spectroscopic Investigation of the One-Dimensional Confinement of Water and Gas Molecules Inside the Narrow Channels of Single-Walled Carbon Nanotubes, Sofie Cambre, University of Antwerp
  • Estimating Vibrational Displacements from Resonance Raman Intensities of Conjugated Polymer Donor/Acceptor Charge Transfer Complexes, John Grey, University of New Mexico