Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Efficient inner-to-outer wall energy transfer in highly pure double-wall carbon nanotubes revealed by detailed spectroscopy



Maksiem Erkens, Dmitry Levshov, Wim Wenseleers, Han Li, Benjamin Flavel, Jeffrey Fagan, Valentin Popov, Marina Avramenko, salome forel, Emmanuel FLAHAUT, Sofie Cambré


The coaxial stacking of two SWCNTs into a double-wall carbon nanotube (DWCNT), forming a so-called one-dimensional van der Waals structure, leads to synergetic effects that dramatically affect the optical and electronic properties of both layers. In this work, we explore these effects in purified DWCNT samples by a combination of absorption, wavelength-dependent infrared photoluminescence-excitation (PLE) and wavelength-dependent resonant Raman scattering (RRS) spectroscopy. Purified DWCNTs are obtained by careful solubilization that strictly avoids ultrasonication or by electronic-type sorting, both followed by a density gradient ultracentrifugation to remove unwanted SWCNTs that could obscure the DWCNT characterization. Chirality-dependent shifts of the radial breathing mode (RBM) vibrational frequencies and transition energies of the inner and outer DWCNT walls with respect to their SWCNT analogues are determined by advanced 2D fitting of RRS and PLE data of DWCNT and their reference SWCNT samples. This exhaustive data set verifies that fluorescence emission from the inner DWCNT walls of well-purified samples is severally quenched through efficient energy transfer from inner to the outer DWCNT walls. Combined analysis of the PLE and RRS results further reveals that this transfer is inner and outer wall chirality-dependent, and we identify the specific combinations dominant in our DWCNT populations. These obtained results demonstrate the necessity and value of a combined structural characterization approach including PLE and RRS spectroscopy for bulk DWCNT samples.
ACS Nano


Double-wall carbon nanotubes, Raman spectroscopy, Photoluminescence-excitation spectroscopy, Two-dimensional fitting, Energy transfer, Chirality assignment


Erkens, M. , Levshov, D. , Wenseleers, W. , Li, H. , Flavel, B. , Fagan, J. , Popov, V. , Avramenko, M. , forel, S. , FLAHAUT, E. and Cambre, S. (2022), Efficient inner-to-outer wall energy transfer in highly pure double-wall carbon nanotubes revealed by detailed spectroscopy, ACS Nano, [online],, (Accessed June 13, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 28, 2022, Updated February 28, 2023