Low background estimation of metallic-to-semiconducting carbon nanotube ratio by using infrared spectroscopy

Quantification and removal of carbonaceous impurities in a surfactant-assisted carbon nanotube dispersion and its implication on electronic properties

“…This is in line with m-SWNT observation using the IR region. 59,60 By using both of these approaches and the determined 3 value of CI, we deduced the SWNT concentrations present in various SWNT dispersions. For this, we obtained overall weights in each SWNT dispersion with known absorbance.…”

Dopant-Inherent Mechanisms of Atmospheric Stability in Chemically N-Doped Semiconducting Carbon Nanotubes Revealed by Tracking Optical Absorption

“…Figure a,b show that the initial film exhibits a sharp S 11 band (∼0.78 eV). For n-doped semiconducting CNTs by 10 mM N -DMBI (Figure a), the suppression of S 11 absorption upon doping is observed along with the evolution of a broad infrared band (<0.25 eV) that corresponds to one-dimensional plasmon resonance. ,,, However, a rapid recovery of the S 11 band and the simultaneous decrease of the plasmon resonance were observed after air exposure as shown in Figure c. Interestingly, this behavior was barely reproduced upon vacuum drying at 80 °C.…”

“…After centrifugation (Kubota 5500) for 10 min at 23 °C and 13 190 g , the upper 75% supernatants were collected by pipetting so as not to shake and disturb them. SWCNT thin films were prepared by filtering the dispersion on 0.2 μm-pore membrane filters, followed by rubbing transfer to PET films. − …”

Changes in the Electrophysical Parameters of Nanomodified Elastomers Caused by Electric Current’s Passage

“…Conductive fillers, such as carbon nanotubes (CNTs), exhibit either metallic or semiconducting properties [ 26 ]. It should be noted that the morphological diversity of carbon nanomaterials, namely CNT and, in particular, multi-walled carbon nanotubes (MWNTs) with many concentric carbon shells or aligned single-walled nanotubes (SWNT), are complex composite conductors including many weakly bonded nanotubes, each of which has a different electronic structure and, consequently, electrical properties [ 27 ].…”

“…The morphology of MWNTs can be controlled using the method of selective removal of single carbon shells from the overall structure of MWNTs and SWNTs to adapt the properties of these composite nanotubes to any practical problems [ 26 , 27 ]. It is possible to remove the shells of MWNTs in stages and characterize different shells individually.…”