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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

Current Position: Scientist 5, Nanophotonics and Optical Nanomaterials Research Thrust, Center for Integrated Nanotechnologies, MPA-CINT, LANL, 2018.-present.

Thrust Leader:  Nanophotonics and Optical Nanomaterials Research Thrust, Center for Integrated Nanotechnologies, MPA-CINT, LANL, 2015-2018.

co-Thrust 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



Laboratory Fellow, LANL, 2017

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  (150 total, Citations ~8165, H-Index: 53 (By Google Scholar))

Complete list available at Google Scholar:

Kim, Y.; He, X.; Velizhanin, K.A.; Sarpkaya, I.; Doorn, S.K.; Htoon, H.; “Photoluminescence Intensity Fluctuations and Decay Dynamics of Individual Carbon Nanotube Defects”, J. Phys. Chem. Lett., 2019, 10, 1423.

Ji, Z.; Dervishi, E.; Doorn, S.K.; Sykora, M.; “Size-Dependent Electronic Properties of Strongly Confined Graphene Quantum Dots”, J. Phys. Chem. Lett., 2019, 10, 953.

Saha, A.; Gifford, B.J.; He, X.; Ao, G.; Zheng, M.; Kataura, H.; Htoon, H.; Kilina, S.; Tretiak, S.; Doorn, S.K.; “Narrow-Band Single-Photon Emission through Selective Aryl Functionalization of Zigzag Carbon Nanotubes”, Nature Chemistry, 2018, 10, 1089.

He, X.; Velizhanin, K.A.; Bullard, G.; Bai, Y.; Olivier, J.-H.; Hartmann, N.F.; Gifford, B.J.; Kilina, S.; Tretiak, S.; Htoon, H.; Therien, M.; Doorn, S.K.; “Solvent and Wavelength-Dependent Photoluminescence Relaxation Dynamics of Carbon Nanotube sp3 Defect States”, ACS Nano, 2018, 12, 8060.

He, X.; Htoon, H.; Doorn, S.K.; Pyatkov, F.; Krupke, R.; Jeantet, A.; Chassagneux, Y.; Voisin, C.; “Carbon Nanotubes as Emerging Quantum Light Sources”, Nature Materials, 2018, 17, 663.

Danne, N.; Kim, M.; Godin, A.G.; Kwon, H.; Gao, Z.; Wu, X.; Hartmann, N.F.; Doorn, S.K.; Lounis, B.; Wang, Y.; Cognet, L.; “Ultrashort Carbon Nanotubes that Fluoresce Brightly in the Near-Infrared”, ACS Nano, 2018, 12, 6059.

Ishii, A.; He, X.; Hartmann, N.F.; Machiya, H.; Htoon, H.; Doorn, S.K.; Kato, Y.K.; “Enhanced Single Photon Emission from Carbon Nanotube Dopant States Coupled to Silicon Microcavities”, Nano Letters, 2018, 18, 3873.

Simpson, J.R.; Roslyak, O.; Duque, J.G.; Haroz, E.H.; Crochet, J.J.; Telg, H.; Piryatinski, A.; Hight Walker, A.R.; Doorn, S.K.;  “Resonance Raman Signature of Intertube Excitons in Compositionally-Defined Carbon Nanotube Bundles”, Nature Comm., 2018, 9, 637.

Ma, X.; Hartmann, N.F.; Velizhanin, K.A.; Baldwin, J.K.S.; Adamska, L.; Tretiak, S.; Doorn, S.K.; Htoon, H.; “Multi-Exciton Emission from Solitary Defect States of Carbon Nanotubes”, Nanoscale, 2017, 9, 16143.

He, X.; Gifford, B.; Hartmann, N.F.; Ihly, R.; Ma, X.; Kilina, S.; Luo, Y.; Shayan, K.; Strauf, S.; Blackburn, J.L.; Tretiak, S.; Doorn, S.K.; Htoon, H.; “Low-Temperature Single Carbon Nanotube Spectroscopy of  sp3 Quantum Defects”, ACS Nano, 2017, 11, 10785.

He, X.; Hartmann, N.F.; Ma, X.; Kim, Y.; Ihly, R.; Blackburn, J.L.; Gao, W.; Kono, J.; Yomogida, Y.; Hirano, A.; Tanaka, T.; Kataura, H.; Htoon, H.; Doorn, S.K.; “Tunable Room-Temperature Single-Photon Emission at Telecom Wavelengths from sp3 Defects in Carbon Nanotubes”, Nature Photonics, 2017, 11, 577.

Ma, X.; Cambre, S.; Wenseleers, W.; Doorn, S.K.; Htoon, H.; “Quasi-Phase-Transition in a Single File of Water Molecules Encapsulated in (6,5) Carbon Nanotubes Observed by Temperature-Dependent Photoluminescence Spectroscopy”, Phys. Rev. Lett., 2017, 118, 027402.  (Cited:  7)

Hartmann, N.F.; Pramanik, R.; Dowgiallo, A.-M.; Ihly, R.; Blackburn, J.L.;  Doorn, S.K.; “Photoluminescence Imaging of Polyfluorene Surface Structures on Semiconducting Carbon Nanotubes:  Implications for Thin Film Exciton Transport”, ACS Nano, 2016, 10, 11449.

Hartmann, N.F.; Velizhanin, K.A.; Haroz, E.H.; Kim, M.; Ma, X.; Wang, Y.; Htoon, H.; Doorn, S.K.; “Photoluminescence Dynamics of Aryl sp3 Defect States in Single-Walled Carbon Nanotubes”, ACS Nano, 2016, 10, 8355.

Kim, M.; Adamska, L.; Hartmann, N.F.; Kwon, H.; Velizhanin, K.A.; Piao, Y.; Powell, L.R.; Meany, B.; Doorn, S.K.; Tretiak, S.; Wang, Y..; “Fluorescent Carbon Nanotube Defects Manifest Substantial Vibrational Reorganization”, J. Phys. Chem. C, 2016, 120, 11268.

Hartmann, N.F.; Yalcin, S.E.; Adamska, L.; Haroz, E,H.; Ma, X.; Tretiak, S.; Htoon, H.; Doorn, S.K.; “Photoluminescence Imaging of Solitary Dopant Sites in Covalently Doped Single-Wall Carbon Nanotubes”, Nanoscale, 2015, 7, 20521.

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, 25, 6157.  (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.