Tuned electronic, optical and mechanical properties of pristine and hetero nanotubes of group IV elements (C, Si and Ge)

Mechanically controllable conductance in carbon nanotube based nanowires

“…Herein, the E coh of the electrodes in our devices is shown in Table 1. It is clear that the E coh of the squashed CNT is comparable to the previously reported E coh of the low dimensional carbon based materials, such as pristine CNT ( E coh = −7.51 eV per atom 44 or −8.05 eV per atom 45 ), graphene ( E coh = −7.9 eV per atom 46 or −7.73 eV per atom 47 ), graphyne ( E coh in a range of −6.418 to −7.330 eV per atom 48 ), graphyne nanotubes ( E coh in a range of −7.07 to −7.17 eV per atom 49 or −7.00 to −7.32 eV per atom 50 ) and C 60 fullerenes ( E coh = −7.1 eV per atom 51 ). Besides, the lower the E coh , the more stable the structure.…”

Intercalation of Lithium Atom/Ion in carbon, Silicon and Germanium Nanotubes

“…) 0 a 0 (0) 0.03 a GeNT 5 (5) 2 a 0 (0) 0 a SiNT 2 (0) 0 a 0 (0.15) 0.18 a a Ref [6] within the interacting alkali metal and nanotube atoms results in the band gap narrowing because of the increased electronegativity difference between the two materials. The p x -orbitals are the main sources of the close to the Fermi level for all systems under study.…”

“…Carbon nanotubes (CNTs) emergence has opened up exciting possibilities for exploring new types of one-dimensional nanostructured materials with favourable physical characteristics for a variety of technological needs [1][2][3][4][5]. Apart from CNTs, researchers have also developed and investigated nanotubes made of materials such as Silicon and Germanium, in different geometries [6]. It is widely acknowledged that pristine nanotubes belonging to group IV elements; based on their chirality, display metallic or semiconducting properties.…”

“…It is widely acknowledged that pristine nanotubes belonging to group IV elements; based on their chirality, display metallic or semiconducting properties. Moreover, their considerable band gap allows the manipulation of their electrical and optical characteristics [6].…”

“…al. [6] examined the atomic configurations of intercalated tubular nanostructures of group IV as well as their individual stabilities in terms of their particular electronic band structures. In this paper we compare how the electronic structure of pure C, Si and Ge nanotubes is affected by the intercalation of a Li atom or ion.…”