Abstract
Abstract
Highlights
The most significant Raman bands of single wall carbon nanotubes (SWCNTs) are the radial breathing mode (RBM), the tangential displacement mode, which is known as the G band, the disorder induced mode, which shows the density of the defects (D), and the highfrequency two-phonon mode (2D or G9).[49]
We report a self-assembly process to achieve multilayer graphene (MLG) and SWCNT films at the liquid/liquid interface
UV–Vis spectroscopy was used to measure the concentration of the SWCNT and MLG dispersions, these measurements were carried out using a UV–Vis absorption spectrometer (DH-2000-BAL, Ocean Optics, Duiven, Netherlands) and USB2000 interface (Micropack GmbH, Ostfildern, Germany)
Summary
The functionalization/impregnation of low-dimensional carbon materials, i.e., the single-atomic layer carbons, graphene (GR),[1] and single wall carbon nanotubes (SWCNTs),[2] has led to a surge of interest in a variety of modification techniques, such as low-cost chemical doping procedures, to tailor the electronic, structural, and chemical properties of GR and SWCNTs.[3,4,5,6] Several studies related to the formation of GR or SWCNT-based nanostructures using Pd or Pt as a functionalizing agent have been reported, but in these cases the time to impregnate the nanoscale carbon materials is usually 12 (Refs. 6–9) to 24 h.10. The presence of covalent bonds, dopants and their spatial distribution can all be detected.[34,35] The Raman spectrum of a single-layer GR sheet has two characteristic features (G and 2D bands); the G peak is associated with the E2g vibrational mode of the sp[2] bonds and the 2D band is caused by the scattering of two phonons and, independent of defects, it is instead affected by strain.[36,37,38,39,40] Both n- and p-type doping of monolayer GR cause a blueshift (frequency increase) in the G band,[41] while the 2D band frequency of monolayer GR increases for p-type doping but decreases for n-type doping This behavior can be observed in electrochemically gated GR37 and, by comparison of the relative position and intensity of the G and 2D bands, it is relatively easy to determine the degree of doping.[42,43,44] This technique is frequently used to investigate either the state of SWCNTs or their composites with metal nanoparticles.[45,46,47,48] The most significant Raman bands of SWCNTs are the radial breathing mode (RBM), the tangential displacement mode, which is known as the G band, the disorder induced mode, which shows the density of the defects (D), and the highfrequency two-phonon mode (2D or G9).[49]. This impregnation/functionalization method is an alternative route to synthesize Pt or Pd coated GR or SWCNT composite materials at the ITIES within a short (maximum 3 h) preparation time
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