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Narrow-band single-photon emission through selective aryl functionalization of zigzag carbon nanotubes


The introduction of sp3 defects into single-walled carbon nanotubes through covalent functionalization can generate new light-emitting states and thus dramatically expand their optical functionality. This may open up routes to enhanced imaging, photon upconversion, and room-temperature single-photon emission at telecom wavelengths. However, a significant challenge in harnessing this potential is that the nominally simple reaction chemistry of nanotube functionalization introduces a broad diversity of emitting states. Precisely defining a narrow band of emission energies necessitates constraining these states, which requires extreme selectivity in molecular binding configuration on the nanotube surface. We show here that such selectivity can be obtained through aryl functionalization of so-called ‘zigzag’ nanotube structures to achieve a threefold narrowing in emission bandwidth. Accompanying density functional theory modelling reveals that, because of the associated structural symmetry, the defect states become degenerate, thus limiting emission energies to a single narrow band. We show that this behaviour can only result from a predominant selectivity for ortho binding configurations of the aryl groups on the nanotube lattice.

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Fig. 1: Chirality dependence of aryl diazonium binding configurations.
Fig. 2: Chirality dependence of defect-state photoluminescence spectra.
Fig. 3: Single-tube photoluminescence spectra of 13 aryl-functionalized (11,0) nanotubes.
Fig. 4: Calculated defect-state photoluminescence spectra.
Fig. 5: Chirality-dependent aryl-diazonium reaction kinetics.


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This work was conducted in part at the Center for Integrated Nanotechnologies, a US Department of Energy, Office of Science user facility, and supported in part by the Center for Nonlinear Studies and by Los Alamos National Laboratory Directed Research and Development funds. S.K. acknowledges financial support from NSF Grant CHE-1413614 for studies of functionalized carbon nanotubes. For computational resources and administrative support, the authors thank the Center for Computationally Assisted Science and Technology (CCAST) at North Dakota State University. The authors also acknowledge the LANL Institutional Computing (IC) Program for providing computational resources. H.K. acknowledges support from JSPS KAKENHI grant no. JP25220602. Correspondence and requests for materials should be addressed to S.K.D. or S.T.

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S.K.D. conceived and designed the experiments. Nanotube separations, functionalization, and spectroscopic characterization were performed by A.S. with assistance from X.H. under the supervision of S.K.D. Single-nanotube spectroscopy was performed by X.H. under the supervision of H.H. Additional purified nanotube material was provided by G.A., M.Z. and H.K. Theoretical modelling was performed by B.J.G. under the supervision of S.T. and S.K. All authors contributed to the analysis and interpretation of results. A.S., B.J.G., S.T. and S.K.D. wrote the manuscript with assistance from all co-authors.

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Correspondence to Sergei Tretiak or Stephen K. Doorn.

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Supplementary Figures 1–5, Supplementary Table 1, Supplementary Computational Methods

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Saha, A., Gifford, B.J., He, X. et al. Narrow-band single-photon emission through selective aryl functionalization of zigzag carbon nanotubes. Nature Chem 10, 1089–1095 (2018).

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