Classification for double-walled carbon nanotubes

Pt‐Catalyzed Formation of Ni Nanoshells on Carbon Nanotubes

“…This value agrees well with the interwall spacing of MWNTs reported by Kiang and co-workers, [20] which range from 0.34 to 0.39 nm depending on the diameter of the outer nanotubes, as well as with the interplanar distance of graphite (0.336 nm). [21] Interwall and interplanar distances were determined by Fourier transform analysis of the HRTEM image shown in Figure 5 b for MWNTs (0.34 nm), Pt (0.22 nm), and Ni (0.20 and 0.17 nm), thereby confirming the pre-designed structure of the obtained CNT/Pt@Ni nanocomposites.…”

Synthesis, Characterization and Chirality Identification of Double-Walled Carbon Nanotubes

“…2 (f) (outer diameter 2.0 nm and inner diameter 1.34nm). A. Charlier et al considered that this phenomenon was related to the different chirality combinations of coaxial tubes [11]. Moreover, theoretical calculation shows that an interlayer spacing range is possible from the point of energy stability [5].…”

“…For example, if the inner diameter is 1.20 nm, the corresponding outer diameter may be 1.98 or 1.94 nm. The tube diameters cannot take continuous but discrete values due to the effect of their chirality [11]. Therefore, several secondary inner tubes with different diameters can be grown near an ideal tube diameter with a minimum energy determined only by the van der Waals interaction with parent outer tube, even slightly increasing the total electronic energy of DWNTs [5,10].…”

Crystal orbital study on the combined carbon nanowires constructed from linear carbon chains encapsulated in zigzag double-walled carbon nanotubes

“…The zigzag DWCNT here is denoted by (m 1 , 0)À(m 2 , 0), where (m 1 , 0) is the inner tube, and (m 2 , 0) is the outer tube. It has been pointed out that the distance between the two coaxial zigzag tubes of DWCNT(m 1 , 0)À(m 2 , 0) is close to 3.3 Å (the interlayer distance in bulk graphite) when m 2 Àm 1 ¼ 9 to form a more stable zigzag DWCNT [37], and this fact also agrees with the recently obtained ultra-thin DWCNTs [28]. In order to study the carbon chains encapsulated in DWCNTs (C chain @DWCNTs) with different inner and outer tubes, totally eight zigzag DWCNTs, including (7, 0)-(16, 0), (8, 0)-(16, 0), (8, 0)-(17, 0), (8, 0)-(18, 0), (9, 0)-(17, 0), (9, 0)-(18, 0), (9, 0)-(19, 0) and (10, 0)- (19,0), are selected to form the C chain @DWCNTs in this paper.…”