Single walled carbon nanotubes SWCNTs

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... 

Keywords Chemical Vapour Deposition (CVD), Single Walled Carbon Nanotubes (SWCNTs), Catalyst. 

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. 

Metallic nanoparticles and single-walled carbon nanotubes (SWCNTs) exhibit nanoscale dimensions comparable with the dimensions of redox proteins. This enables the construction of NP-enzyme or SWCNT-enzyme hybrids that combine the unique conductivity features of the nanoelements with the biocatalytic redox properties of the enzymes, to yield wired bioelectrocatalyts with large electrode surface areas. Indeed, substantial advances in nanobiotechnology were achieved by the integration of redox enzymes with nanoelements and the use of the hybrid systems in different bioelectronic devices.35... 

Ref. [14]. From one CD-R, it is possible to produce more than 50 pairs of such electrodes, which reduces the cost per electrode and suggests the disposability of the working electrode. A single-wall carbon nanotube (SWCNT) modified gold electrode was also employed in connection with CE microchips and displayed improved sensitivity and separation resolution compared to bare gold electrode, reflecting the electrocatalytic activity of SWCNT [102],... 

Figure 15.32 (a) Single walled carbon nanotube (SWCNT) with capped end (b) multi-walled carbon... 

In 2007, a report on single-walled carbon nanotubes (SWCNTs) described the reaction with singlet oxygen [66]. Purification was simplified due to the contrasting solubility properties of unfunctionalized and oxyfunctionalized SWCNTs, although it was uncertain whether the SWCNT peroxides were formed from a [2 + 2]-cycload-dition, a [2 + 4]-cydoaddition, or both [66]. Subsequent reports found SWCNTs to be of very low chemical reactivity with 102 [67, 68], Rather, SWCNTs were proposed to physically quench singlet oxygen (to convert 02 to 302) with rate constants on the order of 108 M 1 s 3. 

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],... 

The obtained temperature dependencies had shown that the quantity of desorbed hydrogen is increased with increasing of the temperature for all carbon samples (Fig. 2). Maximal hydrogen content (0.92 % wt.) was registered for the soot collected at the outlet surface of the fullerene synthesis chamber. By the method of electron microscopy it was detected that this sample contained 9% of fullerenes and more than 40% of single-wall carbon nanotubes (SWCNT). 

MWCNT), was first discovered by Soviet scientists in 1952 [88] and then were rediscovered by others, but largely ignored it gained attention after the experimental work by Iijima40 in 1991 [89], who also co-discovered the 1-nm-diameter single-walled carbon nanotube (SWCNT) [90,91]. 

It is well known that catalyst support plays an important role in the performance of the catalyst and the catalyst layer. The use of high surface area carbon materials, such as activated carbon, carbon nanofibres, and carbon nanotubes, as new electrode materials has received significant attention from fuel cell researchers. In particular, single-walled carbon nanotubes (SWCNTs) have unique electrical and electronic properties, wide electrochemical stability windows, and high surface areas. Using SWCNTs as support materials is expected to improve catalyst layer conductivity and charge transfer at the electrode surface for fuel cell oxidation and reduction reactions. Furthermore, these carbon nanotubes (CNTs) could also enhance electrocatalytic properties and reduce the necessary amount of precious metal catalysts, such as platinum. 

---