The structure of 1D and 3D CuI nanocrystals grown within 1.5–2.5 nm single wall carbon nanotubes obtained by catalyzed chemical vapor deposition

Study of one-dimensional crystal@single wall carbon nanotube nanocomposites using atomic resolution scanning transmission electron microscopy

“…When the diameter of SWCNT D av > 2.0 nm and the possibility for a radial growth arises, a nanocomposite 3DCuI@SWCNT (CCVD) is formed as a result. A CuI crystal is oriented along the nanotube axis like in the previous case, but has the possibility for a radial growth, i.e., the crystal is formed not by a single but several cells and its structure is similar to that of a solid crystal [10]. In addition, the influence of the nanotube chirality on the crystalline structure inside it is noted [9].…”

“…Under the electron beam, a reversible phase transition from a hexagonal structure into a defective cubic one is observed. In the synthesis by catalytic chemical vapor deposition (CCVD) from a gaseous phase, the diameter of nanotubes is larger and amounts to 1.5-2.5 nm, which made it possible to study the influence of the diameter of nanotubes on the nanocrystal lattice to be formed [10]. It was shown in this work that at D av = 1.5-2.0 nm the crystal is still quasi-1D; it represents a chain of deformed full cubic elementary cells with a structural type of ZnS (or NaCl depending on the arrangement of cations) connected by ribs [001].…”

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

“…The properties of such one-dimensional crystals are known to differ drastically from that of the bulky phases [8]. For instance, band gap expansion has been observed for 1D crystals of SnSe, while a gapless energy spectrum was found for 1D crystals of SnTe [9,10] or S [11].…”

Advances in tailoring the electronic properties of single-walled carbon nanotubes

“…319,322] it was discussed that the shift of the G-band peaks towards higher frequencies corresponded to the charge transfer from the nanotubes to the incorporated substances and the shift of the G-band peaks towards lower frequencies testified to the charge transfer from the encapsulated substances to the SWCNT walls. On the basis of this…”