Purity Measurement of Single-Walled Carbon Nanotubes by Uv-Vis-Nir Absorption Spectroscopy and Thermogravimetric Analysis

Abstract

We measured the content of single-walled carbon nanotubes (SWCNTs) in SWCNT soot within 3.7% error using UV-VIS-NIR absorption spectroscopy. We also propose a better overall evaluation method by combining thermogravimetic analysis with UV-VIS-NIR absorption spectroscopy to analyze the purity of SWCNT providing the accurate assessment of the amounts of noncarbonaceous impurity, carbonaceous impurity, and SWCNT each with respect to a highly purified reference.

Physical characterizations of semi-conducting conjugated polymer-CNTs nanocomposites

“…It is clear from Fig. 3 that there are two peaks (peak I and peak II) at around 0.78 eV and 1.35 eV which represent the characteristic peaks of SWCNT [23]. From the obtained results, we can say that the grown CNTs are almost single walled type.…”

“…The absorption spectra do not show any significant change from that of the P3OT polymer up on adding nanotubes up to 1 wt %. The CNTs characterstic peaks can be clearly observed when the concentration of CNTs is equal or above 1 wt% [23]. It is also clear that the appearnce of CNTs characterstic peaks depends on the optical volume of the P3OT matrix.…”

“…One of the power full analyses used to recognize both the existence and quality of SWCNTs is UV-visible and NIR spectra [22][23][24]. Jeong, M.S.…”

“…Jeong, M.S. and Byeon, C.C [23] reported that the absorption spectrum of SWCNT mainly consists of three absorption peaks. The first peak at around 0.8 eV and the second is around 1.5 eV.…”

Binding studies of hydroxylated Multi-Walled Carbon Nanotubes to hemoglobin, gamma globulin and transferrin

“…Most significantly, at the higher energy states of the ultraviolet (UV) and far-UV, broad absorptions are seen due to the plasmon resonances in the free electron cloud of the nanotube ᴨ electrons. Two general bands appearing in this region are the ᴨ Plasmon band associated with collective excitations of ᴨ electrons, found at around 310-155 nm (4.0-8.0 eV) [58]. Other one remains the ᴨ + σ Plasmon band, associated with all electrons, at approximately 125-40 nm (10-30 eV).…”