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Stephen K. Doorn

Stephen Doorn

Phone (505) 667-2541


  • CINT
  • Synthesis
  • Property Measurements


Nanophotonics and Optical Nanomaterials

Current research interests in spectroscopic characterization and development of nanomaterials including a current focus on carbon nanomaterials, carbon nanotubes, graphene, and surface enhanced Raman active materials.

  • Spectroscopic studies of fundamental electronic structure and optical properties of carbon nanotubes and graphene using Raman and photoluminescence spectroscopy and imaging at the ensemble, single-tube, and single-site levels.
  • Controlling nanotube optical properties via covalent and non-covalent functionalization chemistry.  Introduction of 0-D dopant sites to generate new optical states
  • Direct photoluminescence imaging as a probe of the nanotube surface environment and the interplay between 1-D excitons and 0-D dopant states. Time-resolved photoluminescence as a probe of exciton dynamics.
  • Control of surface chemistry as a route to enhancing nanotube separations and for modulating charge and energy flow in nanotube hybrid assemblies.
  • Hybrid assemblies of graphene and other semiconducting nanomaterials.\
  • SERS as a probe of materials dynamics and development of SERS-active nanoparticle tags for bioanalytical applications.


Ph.D., Physical Chemistry, Northwestern University, 1990

M.S., Physical Chemistry, Northwestern University, 1986

B.S., Chemistry with Honors, Phi Beta Kappa, University of Wisconsin, 1985


Professional Appointments

Thrust Leader:  Nanophotonics and Optical Nanomaterials Research Thrust, Center for Integrated Nanotechnologies, MPA-CINT, LANL, 2015-present.

Science Partner Leader: Nanophotonics and Optical Nanomaterials Research Thrust, Center for Integrated Nanotechnologies, MPA-CINT, LANL, 2010-2015.

Team Leader: Optical Nanomaterials and Spectroscopy, C-PCS, LANL, 2006-2010.

Technical Staff Member: Materials Characterization and Spectroscopy, C-CSE, LANL, 2000-2006.

Technical Staff Member: Analytical Spectroscopy and Inorganic Analysis Team Leader, CST-9, LANL 1992-2000.

Director's Post-Doctoral Research Fellow: INC-4,  LANL, 1990-1992.


Professional Societies

American Chemical Society

American Physical Society



Fellow of the American Physical Society, 2014

LANL Fellows Prize for Research, 2011

DOE Office of Science Outstanding Mentor Award, 2008

Nanotech Briefs Nano50 Award, 2005

Defense Programs Award of Excellence, 2001, 2003

LANL Distinguished Performance Award, 1998



“Separation of Single-Walled Carbon Nanotubes into Chirally Enriched Fractions”, 8,153,014, awarded April 10, 2012.

“Fluorescent Single-Walled Nanotube/Silica Composite Materials” 8,395,123, awarded March 12, 2013.



Selected Recent Publications  (120 total, Citations ~5300, H-Index: 41 (By Google Scholar))

Complete list available at Google Scholar:

Ma, X.; Baldwin, J.K.S.; Hartmann, N.F.; Doorn, S.K.; Htoon, H.; “Solid-State Approach for  Fabrication of PhotoStable Oxygen-Doped Carbon Nanotubes”, Adv. Funct. Mat., 2015, ASAP available online, DOI:  10.1002/adfm.201502580.  (Cover Article)

Ma, X.; Hartmann, N.F.; Baldwin, J.K.S.; Doorn, S.K.; Htoon, H.; “Room Temperature Single Photon Generation from Solitary Dopants in Single Wall Carbon Nanotubes”, Nature Nanotech., 2015, 10, 671.

Ma, X.; Roslyak, O.; Duque, J.G.; Doorn, S.K.; Piryatinski, A.; Dunlap, D.H.; Htoon, H.; “Influences of Exciton Diffusion and Exciton-Exciton Annihilation on Photon Emission Statistics of Carbon Nanotubes”, Phys. Rev. Lett., 2015,  115, 017401.

Haroz, E.H.; Duque, J.G.; Simpson, J.; Barros, E.; Telg, H.; Hight Walker, A.R.; Tu, X.; Zheng, M.; Kono, J.; Doorn, S.K.; “Asymmetric Excitation Profiles in the Resonance Raman Response of Armchair Carbon Nanotubes”, Phys. Rev. B, 2015, 91, 205446.

Fagan, J.A.; Haroz, E.H.; Ihly, R.; Gui, H.; Blackburn, J.L.; Simpson, J.R.; Lam, S.; Hight Walker, A.R.; Doorn, S.K.; Zheng, M.; “Isolation of  > 1 nm Diameter Single-Wall Carbon Nanotube Species Using Aqueous Two Phase Extraction”, ACS Nano, 2015, 9, 5377.

Subbaiyan, N.K.; Parra-Vasquez, A.N.G.; Cambre, S.; Santiago Cordoba, M.A.; Yalcin, S.E.; Hamilton, C.E.; Mack, N.H.; Blackburn, J.; Doorn, S.K.; Duque, J.G.; “Benchtop Extraction of Isolated Individual Single-Walled Carbon Nanotubes”, Nano Research, 2015, 9, 4043.

Telg, H.; Haroz, E.H.; Duque, J.G.; Tu, X.; Khripin, C.Y.; Fagan, J.; Zheng, M.; Kono, J.; Doorn, S.K.; “Diameter Dependence of TO Phonon Frequencies and the Kohn Anomaly in Armchair Metallic Single-Wall Carbon Nanotubes”, Phys. Rev. B, 201490, 245422.

Adamska, L.; Nayyar, I.; Chen, H.; Swan, A.K.; Oldani, N.; Fernandez-Alberti, S.; Doorn, S.K.; Tretiak, S.; “Self-Trapping of Excitons, Violation of the Condon Approximation and Efficient Fluorescence in Conjugated Cycloparaphenylenes”, Nano Letters, 2014, 14, 6539.

Ma, X.; Adamska, L.; Yamaguchi, H.; Yalcin, S.E.; Tretiak, S.; Doorn, S.K.; Htoon, H.; “Electronic Structure and Chemical Nature of Oxygen Dopant States in Carbon Nanotubes”, ACS Nano, 2014, 8, 10782.

Subbaiyan, N.K.; Cambre, S.; Parra-Vasquez, N.G.; Haroz, E.H.; Doorn, S.K.; Duque, J.G.; “Role of Surfactants and Salt in Aqueous Two-Phase Separation of Carbon Nanotubes Towards Simple Chirality Isolation”, ACS Nano, 2014, 8, 1619.

Arnold, M.S.; Blackburn, J.L.; Crochet, J.J.; Doorn, S.K.; Duque, J.G.; Mohite, A..; Telg, H.; “Recent Developments in the Photophysics of Single-Wall Carbon Nanotubes for Active and Passive Material Elements in Thin Film Photovoltaics”,  invited review, Phys. Chem. Chem. Phys., 2013, 15, 14896.

Berciaud, S.; Li, X.; Htoon, H.; Brus, L.E.; Doorn, S.K.; Heinz, T.F.; “Intrinsic Lineshape of the Raman 2D Mode in Freestanding Graphene Monolayers”, Nano Letters, 2013, 13, 3517.

Duque, J.G.; Oudjedi, L.; Crochet, J.J.; Tretiak, S.; Lounis, B.; Doorn, S.K.; Cognet, L.; “Mechanism of Electrolyte Induced Brightening of Single-Wall Carbon Nanotubes,” J. Am. Chem. Soc., 2013, 135, 3379.

Crochet, J.J.; Duque, J.G.; Werner, J.H.; Lounis, B.; Cognet, L.; Doorn, S.K.; “Disorder Limited Exciton Transport in Colloidal Single-Wall Carbon Nanotubes”, Nano Letters, 2012, 12, 5091.

Duque, J.G.; Telg, H.; Chen, H.; Swan, A.K.; Shreve, A.P.; Tu, X.; Zheng, M.; Doorn, S.K.; “Quantum Interference Between the Third and Fourth Excitonic States in Semiconducting Carbon Nanotubes Using Resonance Raman Spectroscopy”, Phys. Rev. Lett., 2012, 108, 117404.

Crochet, J.J.; Duque, J.G.; Werner, J.H.; Doorn, S.K.; “Photoluminescence Imaging of Localized and Delocalized Electronic Defects in Single-Wall Carbon Nanotubes”, Nature Nanotech., 2012, 7, 126.

Telg, H.; Duque, J.G.; Staiger, M.; Maultzsch, J.; Thomsen, C.; Tu, X.; Zheng, M.; Hennrich, F.; Kappes, M.; Doorn, S.K.; “Chiral Index Dependence of the G+ and G- Raman Modes in Semiconducting Carbon Nanotubes”, ACS Nano, 2012, 6, 904.

Haroz, E.H.; Duque, J.G.; Rice, W.D.; Densmore, C.G.; Kono, J.; Doorn, S.K.; “Resonant Raman Spectroscopy of Armchair Carbon Nanotubes:  Absence of Broad G- Feature”, Phys. Rev. B, 2011, 84, 121403 (R).

Duque, J.G.; Hamilton, C.E.; Gupta, G.; Crooker, S.A.; Crochet, J.J.; Mohite, A.; Htoon, H.; Defriend Obrey, K.A.; Dattlebaum, A.M.; Doorn, S.K.; “Fluorescent Single-Walled Carbon Nanotube Aerogels in Surfactant-Free Environments”, ACS Nano, 2011, 5, 6686.

Duque, J.G.; Chen, H.; Swan, A.K.; Shreve, A.P.; Kilina, S.; Tretiak, S.; Tu, X.; Zheng, M.; Doorn, S.K.; “Violation of the Condon Approximation in Semiconducting Carbon Nanotubes”, ACS Nano, 2011, 5, 5233.

Mack, N.H.; Bailey, J.A.; Doorn, S.K.; Chen, C.-A.; Gau, H.-M.; Williams, D.J.; Akhadov, E.A.; Wang, H.-L.; “Mechanistic Study of Silver Nanoparticle Formation on Conducting Polymer Surfaces”, Langmuir, 2011, 27,  4979.

Duque, J.G.; Densmore, C.G.; Doorn, S.K.; “Saturation of Surfactant Structure at the Single-Walled Carbon Nanotube Surface”, J. Am. Chem. Soc., 2010, 132, 16165.

Haroz, E.H.; Rice, W.D.; Lu, B.Y.; Hauge, R.H.; Ghosh, S.; Weisman, R.B.; Doorn, S.K.; Kono, J.; “Enrichment of Armchair Carbon Nanotubes via Density Gradient Ultracentrifugation:  Raman Evidence”, ACS Nano, 2010, 4, 1955.

Goddard, G.; Brown, L.O.; Habbersett, R.; Brady, C.I.; Martin, J.C.; Graves, S.W.; Freyer, J.P.; Doorn, S.K.; “High Resolution Spectral Analysis of Individual Surface-Enhanced Raman-Active Nanoparticle Spectral Tags in Flow”, J. Am. Chem. Soc., 2010, 132, 6081. (Cover Article)