Soluble Ultra-Short Single-Walled Carbon Nanotubes

Abstract

Soluble, ultra-short (length < 60 nm), carboxylated, single-walled carbon nanotubes (SWNTs) have been prepared by a scalable process. This process, predicated on oleum's (100% H2SO4 with excess SO3) ability to intercalate between individual SWNTs inside SWNT ropes, is a procedure that simultaneously cuts and functionalizes SWNTs using a mixture of sulfuric and nitric acids. The solubility of these ultra-short SWNTs (US-SWNTs) in organic solvents, superacid and water is about 2 wt %. The availability of soluble US-SWNTs could open opportunities for forming high performance composites, blends, and copolymers without inhibiting their processibility.

Insights into the surface and redox properties of single-walled carbon nanotube—cobalt(II) tetra-aminophthalocyanine self-assembled on gold electrode

“…1 shows the comparative survey X-ray photoelectron spectra of the (i) bare; (ii) Au-AET; (iii) Au-AET-SWCNT; and (iv) Au-AET-SWCNT-CoTAPc. The S (2p) peak at 162.5 eV is assigned to the normal gold-sulphur bond [16], [55], [56], [57], [58] and [59]. The presence of the N atoms (in the BE region of 395-405 eV) in the SAMs are evident in Fig.…”

Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes

“…Similar LPE processes were mostly developed originally for SWCNT powders 105 to obtain more individualized nanotubes and remain under development. 106 While acid oxidation of SWCNTs does not routinely lead to a spontaneously soluble material akin to GO (although possible with extreme conditions 107 ), it is commonly applied to remove impurities, provide functionalization anchoring sites (section 4.1), and improve subsequent dispersibility.…”

Half-Metallic Zigzag Carbon Nanotube Dots

“…[19][20][21][22][23][24][25][26]28,29,42,[45][46][47][48][49][50][51][52] Interestingly, contradicting results have been reported in the literature, 33 indicating that the ground state of unpassivated zigzag CNTs has a low-spin AFM ordering even for nanotubes that have earlier been considered to present a high-spin ferromagnetically ordered ground state. 32 In light of the considerable progress that has been made in the synthesis and fabrication of ultra-short [60][61][62][63][64] and open ended 65 CNTs and ultra-narrow GNRs, [66][67][68][69] it is desirable to obtain a full understanding of their electronic properties. Such understanding may prove important in future applications of these molecules in nanoelectronic and nanospintronic devices.…”