Single-wall carbon nanotubes mechanical properties

The force effect is applicable to investigation of the mechanical properties of nanomaterials [28, 29]. We measured TERS spectra of a single wall carbon nanotube (SWCNT) bundle with a metallic tip pressing a SWCNT bundle [28]. Figure 2.13a-e show the Raman spectra of the bundle measured in situ while gradually applying a force up to 2.4 nN by the silver-coated AFM tip. Raman peaks of the radial breathing... 

CNTs may consist of just one layer (i.e. single-walled carbon nanotubes, SWCNTs), two layers (DWCNTs) or many layers (MWCNTs) and per definition exhibit diameters in the range of 0.7 < d < 2 nm, 1 < d < 3 nm, and 1. 4 < d < 150 nm, respectively. The length of CNTs depends on the synthesis technique used (Section 1.1.4) and can vary from a few microns to a current world record of a few cm [16]. This amounts to aspect ratios (i.e. length/diameter) of up to 107, which are considerably larger than those of high-performance polyethylene (PE, Dyneema). The aspect ratio is a crucial parameter, since it affects, for example, the electrical and mechanical properties of CNT-containing nanocomposites. 

Ley, Y. W. Park, S. Berber, D. Tomanek, S. Roth, Effect of SOC12 treatment on electrical and mechanical properties of single-wall carbon nanotube networks, J. Am. Chem. Soc., vol. 127, pp. 5125-5131, 2005. 

T. E. Chang, A. Kisliuk, S. M. Rhodes, W. J. Brittain, A.P. Sokolov, Conductivity and mechanical properties of well-dispersed single-wall carbon nanotube/polystyrene composite, Polymer, vol. 47, pp. 7740-7746, 2 0 06. 

H. Y. Song, X. W. Zha, The effects of boron doping and boron grafts on the mechanical properties of single-walled carbon nanotubes., Journal of Physics D-Applied Physics 2009,... 

Yu, M.-F., Files, B.S., Arepalli, S. and Ruoff, R.S., Tensile loading of ropes of single wall carbon nanotubes and their mechanical properties , Phys. Rev. Lett., 2000, 84, 5552-5555. 

Active carbon has exceptional adsorption properties because of its high surface area, its developed porosity, the wide variety of functional groups in its surface, and its relatively high mechanical strength [77-79], As a result, active carbons are usually applied in numerous industrial procedures for the elimination of impurities from gases and liquids [77], In this section, two examples of carbon-related adsorbents, that is, a Fisher powdered active carbon and a single-walled carbon nanotube (SWCNT), are presented [80],... 

Single-walled carbon nanotubes are known to possess extraordinary strength.138 Mechanical properties of BN nanotubes would be worthy of exploration. Unlike carbon nanotubes, BN nanotubes are predicted to have stable insulating properties independent of their structure and morphology. Thus, BN tubes can be used as nano-insulating devices for encapsulating conducting materials like metallic wires. Filled BN nanotubes are expected to be useful in nanoscale electronic devices and for the preparation of nano-structured ceramics. 

Double-walled carbon nanotubes (DWNTs), first observed in 1996, constitute a unique family of carbon nanotubes (CNTs). -2 DWNTs occupy a position between the single-walled carbon nanotubes (SWNTs) and the multiwalled carbon nanotubes (MWNTs), as they consist of two concentric cylinders of rolled graphene. DWNTs possess useful electrical and mechanical properties with potential applications. Thus, DWNTs and SWNTs have similar threshold voltages in field electron emission, but the DWNTs exhibit longer lifetimes.3 Unlike SWNTs, which get modified structurally and electronically upon functionalization, chemical functionalization of DWNTs surfaces would lead to novel carbon nanotube materials where the inner tubes are intact. The stability of DWNTs is controlled by the spacing of the inner and outer layers but not by the chirality of the tubes 4 therefore, one obtains a mixture of DWNTs with varying diameters and chirality indices of the inner and outer tubes. DWNTs have been prepared by several techniques, such as arc discharge5 and chemical vapor depo-... 

---