Morphology dependence of radial elasticity in multiwalled boron nitride nanotubes Appl. Phys. Lett. 101, 103109 (2012) Enhanced Raman scattering and photoluminescence of Bi3.25La0.75Ti3O12 nanotube arrays for optical and ferroelectric multifunctional applications Appl. Phys. Lett. 101, 081903 (2012) First-principles study of hydrogenated carbon nanotubes: A promising route for bilayer graphene nanoribbons Carbonaceous purity assessment for chemical vapor deposition multiwalled carbon nanotubes ͑MWNTs͒ using Raman spectroscopy was investigated. Raman spectroscopy was performed on a reference sample set containing predetermined ratios of MWNTs and representative synthesis by-products. Changes in the characteristic Raman peak ratios ͑i.e., I D / I G , I G Ј / I G , and I G Ј / I D ͒ as a function of MWNT content were measured. Calibration curves were generated from the reference samples and used to evaluate MWNTs synthesized under different conditions with varying purity. The efficacy of using Raman spectroscopy in conjunction with thermogravimetric analysis for quantitative MWNT purity assessment is discussed.
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