Interaction between single walled carbon nanotube and 1D crystal in CuX@SWCNT (X=Cl, Br, I) nanostructures

The structure of nanocomposite 1D cationic conductor crystal@SWNT

“…This value is consistent with EXAFS results, which indicated that CuBr intercalated into the nanotubes forms a crystal with a well-defined local structure (Eliseev et al, 2012).…”

“…Taking the above-mentioned speculations into account, nonpreferred octahedral positions have been excluded from the models for series of image simulations (Eliseev et al, 2012).…”

One-Dimensional Crystals inside Single-Walled Carbon Nanotubes: Growth, Structure and Electronic Properties

“…The degree of crystallinity and the structure of the one-dimensional nanocrystals within the nanotube channel depend strongly on the ratio between the structural parameters of the encapsulated compound and the internal diameter of the SWNT channel. For example, for the CuHal@SWNT and AgHal@SWNT (Hal = Cl, Br, I) systems the degree of crystallinity for nanoparticles incorporated into the SWNT channels increases when passing from the metal chlorides to iodides, which is presumably caused by the increase in the halogen ion radius when passing from Cl to I [r(Cl -) = 1-67, r(Br -) = 1-82, r(I -) =2.06 Å], which causes the increase in the M-Hal bond lengths in this series Eliseev et al, 2011). As a result, in the CuCl@SWNT composite the CuCl single crystal does not completely fill the nanotube's channel, which results in substantial mobility of the Cu and Cl atoms; this, in its turn, leads to a decrease in the degree of crystallinity.…”

“…Most of less-ionic crystals having dense packing of anions in their bulk structures (2-or 3-layer hexagonal lattices) tend to form a two-layer hexagonal packing within the tube. This case is characteristic for copper and silver halides, which have been recently studied in detail Eliseev et al, 2011). Crystals with covalent bonding tend to preserve some structural fragments in one-dimensional crystals.…”

Quasi free-standing one-dimensional nanocrystals of PbTe grown in 1.4 nm SWNTs

“…It should be noted, that Raman spectra of resonantly excited metallic tubes (633 and 785 nm excitation, Fig. 3a, b) in PbTe@SWNT sample also shows typical 'metallic' G-band profile, while the effect on the metallic tubes is known to be most pronounced in the Raman spectra of doped SWNTs [15,16]. This points towards the metallic conductivity of PbTe@m-SWNTs.…”