Quantifying (n,m) species in single-wall carbon nanotubes dispersions by combining Raman and optical absorption spectroscopies
| Autor: | Rishabh M. Jain, G. A. M. Sáfar, Rafael N. Gontijo, Ariete Righi, Cristiano Fantini, Michael S. Strano |
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| Rok vydání: | 2017 |
| Předmět: |
Nanotube
Materials science Oscillator strength Analytical chemistry 02 engineering and technology General Chemistry Carbon nanotube 021001 nanoscience & nanotechnology Absolute concentration 01 natural sciences Optical absorption spectra law.invention symbols.namesake law 0103 physical sciences symbols General Materials Science 010306 general physics 0210 nano-technology Absorption (electromagnetic radiation) Raman spectroscopy Excitation |
| Zdroj: | Carbon. 115:681-687 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2017.01.041 |
| Popis: | Optical absorption in combination with resonant Raman spectroscopies were used for the determination of ( n,m ) distribution and the absolute concentration of single-wall carbon nanotubes (SWCNT) species in few chiralities enriched dispersions. Relative ( n,m ) content was obtained from Raman excitation profiles of the radial breathing modes corrected by the respective Raman cross sections. Absolute concentrations were obtained from the analysis of the optical absorption spectra. The combination of Raman and optical absorption results allowed us to quantify the concentration of each individual species present in the samples and to calculate the oscillator strength for five semiconducting single-wall nanotube species. The oscillator strength is related to the diameter and chiral angle, and their values for E 11 and E 22 optical transitions present opposite behavior if 2 n + m mod 3 = 1 or 2. The proposed protocol can be used as a reliable metrological method for measuring the concentration of SWCNT species in a sample. |
| Databáze: | OpenAIRE |
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