Double-Wall Carbon Nanotubes Doped with Different Br₂ Doping Levels: A Resonance Raman Study

Abstract

This report focuses on the effects of different Br2 doping levels on the radial breathing modes of "double-wall carbon nanotube (DWNT) buckypaper". The resonance Raman profile of the Br2 bands are shown for different DWNT configurations with different Br2 doping levels. Near the maximum intensity of the resonance Raman profile, mainly the Br2 molecules adsorbed on the DWNT surface contribute strongly to the observed omega(Br-Br) Raman signal.

G′band in double- and triple-walled carbon nanotubes: A Raman study

“…At this point, it is important to remember that the RBMs of the inner nanotubes from bundled DWNTs consist of clusters of narrow peaks in comparison to the single-peak characteristics of bundled SWNTs [34]. Several Raman studies have discussed the G bands of bundled DWNTs, for example, the frequency shifts and intensity changes associated with the ω G dependence on E laser , as well as on the growth method or the amount of dopants [22,[35][36][37][38][39]. The present work brings out a new discussion of the annealing temperature dependence of the G band for DWNTs.…”

Raman Spectroscopy and Imaging of Carbon Allotropes

“…For all samples investigated, the resonance Raman spectra are dominated by SWCNT or DWCNT bands at different laser excitation energies (E laser ) [37][38][39]. The Raman spectra obtained with laser lines from 790 to 514.5 nm (E laser from 1.57 to 2.41 eV) are dominated by the characteristic bands from the SWCNTs or DWCNTs.…”

“…Through the years, the infrared and Raman spectroscopies have been the techniques par excellence for the investigation of the vibrational structure of conjugated materials, such as dyes [25], metallic complexes [26][27][28], conducting polymers [29,30], nanocomposites [31][32][33], and carbon allotropes [34][35][36][37][38][39]. The laser is the common source in Raman spectroscopy, the radiation interacts with the sample through the scattering process.…”

“…The resonance Raman spectroscopy technique is sensitive to the electronic, structural, and vibrational properties of CNTs. Our group is using resonance Raman spectroscopy to characterize the interactions between nanotubes and different kinds of molecules [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], such as the conducting polyaniline (PANI), molecular magnets such as (NBu 4 ) 2 [Cu(opba)], [MnCu(opba)] n chains, where opba = ortho-phenylenebis(oxamate), dyes such as phenosafranine (PS) and Nile Blue (NB), and CNTs doped with bromine or iodine.…”

Introductory Chapter: The Multiple Applications of Raman Spectroscopy

“…But, in a state of resonance, a lot of radiation is absorbed, leading to a local heating and frequently can be observed a decomposition of the sample. Despite this problem, the RR spectroscopy has been largely used in the study of the different chromophore units present in many compounds varying from conducting polymers, nanocomposites, carbon allotropes to DNA [17][18][19][20][21].…”