Electronic transport properties of inner and outer shells in near ohmic-contacted double-walled carbon nanotube transistors

Zhang, Yuchun; Zhou, Li; Zhao, Shangqian; Wang, Wenlong; Wang, Enge; Liang, Wenjie

doi:10.1063/1.4882995

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…Even more, based on DOS calculations for labels J and K, only metallic behavior is noticed, for four CNTs involved [(13,13), (12,12), (14,0), and (12,0)] and the two implicated DWCNTs. This issue agrees with Zhang et al who performed electrical measurements on M@S type of DWCNTs and reported that different electron transport behaviors emerge when the outer semiconducting shell is on/off, which reveals that both the outer and the inner shells of the DWCNTs contribute considerably to the electron transport with ohmic contact. In Figure S5 it was included a collage with DOS plots for case C2, where it can be evidenced overlapping orbitals for DWCNT only for labels J/K.…”

Section: Resultssupporting

confidence: 91%

“…In other combinations, a significant difference in the transmission was evaluated for some M@S and S@S systems, compared to that found for the individual tubes. Finally, Zhang et al have investigated electronic transport properties of field‐effect transistor based on DWCNT, particularly those that inner shells are metallic and outer shells are semiconducting. When both shells are turned on, electron‐phonon scattering is noticed to be the dominant phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical study on the electronic structure nature of single and double walled carbon nanotubes and its role on the electron transport

Espinosa‐Torres

Guillén‐López

Martínez-Juárez

et al. 2019

Int J of Quantum Chemistry

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Density functional theory and molecular dynamics (MD) calculations were used to evaluate electronic structure properties in a series of nanotubes with smallest possible diameters (both types: armchair and zigzag), and the corresponding chiral nanotubes (8,m) for 0 ≤ m ≤ 8. The calculations were performed considering a length of 16.5 Å. We evaluated a set of 26 combinations of dual nanotubes (armchair/armchair, zigzag/zigzag, armchair/zigzag, and zigzag/armchair), where the first label corresponds to the outer tube. We extended our study with nine additional systems of double-walled carbon nanotubes (DWCNT) with semiconductor nature. In this regard, we gave insight into the semiconductive or metallic nature inherited to the dual tubes. DWCNT systems were possible to construct by maintaining a radial distance of 3.392 Å for the armchair/armchair arrangement and 3.526 Å for the zigzag/zigzag type. It was considered as a reference, the interplanar distance of graphite (3.350 Å). Electronic transport calculations were also performed on selected DWCNT systems in order to understand the role played by the different symmetries under study. It was evidenced that the electronic structure nature of the systems rules the ability to transport electrons through the DWCNT interface. K E Y W O R D S DFT, DWCNT, electron transmission, energy storage, molecular dynamics 1 | INTRODUCTION Although some experimental efforts have been performed to understand the influence of shells in the electronic structure and electronic transport properties of double-walled carbon nanotubes (DWCNT), a systematic theoretical study to elucidate the relations among the morphology of the single-walled carbon nanotubes (SWCNT) components of DWCNT systems and the electronic transport through the assembled shells are not available in open literature.The study of SWCNT and multi-walled carbon nanotubes (MWCNT) has experienced an outstanding growth in the last decades as possible candidates for a wide range of applications due to their unique electrical, mechanical, and thermal properties. The electronic properties of carbon nanotubes (CNT) are remarkable and they have received great attention. For instance, due to the quantum confinement of the electrons in the circumferential direction, a SWCNT can be either metallic or semiconducting, depending on its geometry, which strongly depends on its chiral

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Theoretical study on the electronic structure nature of single and double walled carbon nanotubes and its role on the electron transport

Espinosa‐Torres

Guillén‐López

Martínez-Juárez

et al. 2019

Int J of Quantum Chemistry

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“…[75,143,144] It has been shown that the inner shell can be electrically active where both shells contribute similarly to the transport. [145][146][147] For this reason, DWCNTs are better intrinsic conductors than large MWCNTs (in which not all shells are coupled) and possibly better than SWCNTs, [148][149][150] while maintaining a high degree of chemical stability. [74] Further, functionalization can happen exclusively on the outer shell, leaving the inner tube intact and isolated.…”

Section: Multi-wall Cntsmentioning

confidence: 99%

A Meta‐Analysis of Conductive and Strong Carbon Nanotube Materials

2021

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A study of 1304 data points collated over 266 papers statistically evaluates the relationships between carbon nanotube (CNT) material characteristics, including: electrical, mechanical, and thermal properties; ampacity; density; purity; microstructure alignment; molecular dimensions and graphitic perfection; and doping. Compared to conductive polymers and graphitic intercalation compounds, which have exceeded the electrical conductivity of copper, CNT materials are currently one‐sixth of copper's conductivity, mechanically on‐par with synthetic or carbon fibers, and exceed all the other materials in terms of a multifunctional metric. Doped, aligned few‐wall CNTs (FWCNTs) are the most superior CNT category; from this, the acid‐spun fiber subset are the most conductive, and the subset of fibers directly spun from floating catalyst chemical vapor deposition are strongest on a weight basis. The thermal conductivity of multiwall CNT material rivals that of FWCNT materials. Ampacity follows a diameter‐dependent power‐law from nanometer to millimeter scales. Undoped, aligned FWCNT material reaches the intrinsic conductivity of CNT bundles and single‐crystal graphite, illustrating an intrinsic limit requiring doping for copper‐level conductivities. Comparing an assembly of CNTs (forming mesoscopic bundles, then macroscopic material) to an assembly of graphene (forming single‐crystal graphite crystallites, then carbon fiber), the ≈1 µm room‐temperature, phonon‐limited mean‐free‐path shared between graphene, metallic CNTs, and activated semiconducting CNTs is highlighted, deemphasizing all metallic helicities for CNT power transmission applications.

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“…Provided a large enough interwall resistivity, , the outer wall(s) would act as sheathing, while current would flow through the inner wall. Moreover, other FWCNT coils that have a semiconducting outer wall(s) and a metallic inner wall(s) could possibly avoid short-circuiting, particularly when tested at low temperatures. ,, Positively gating the p -type semiconducting outer wall(s), thereby depleting it from charge carriers, could further turn it into sheathing. Previous works suggested that near the source and drain electrodes, gating is less effective, allowing current to pass from the electrodes, through the outer wall, to the inner wall. ,, Generally, ∼22% of DWCNTs are expected to have the M@S (i.e., metallic inside semiconducting) electronic configuration and ∼15% of TWCNTs are expected to have the M@S@S configuration .…”

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confidence: 99%

Few-Wall Carbon Nanotube Coils

et al. 2019

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While various electronic components based on carbon nanotubes (CNTs) have already been demonstrated, the realization of miniature electromagnetic coils based on CNTs remains a challenge. Coils made of single-wall CNTs with accessible ends for contacting have been recently demonstrated but were found unsuitable to act as electromagnetic coils because of electrical shorting between their turns. Coils made of a few-wall CNT could in principle allow an insulated flow of current and thus be potential candidates for realizing CNT-based electromagnetic coils. However, no such CNT structure has been produced so far. Here, we demonstrate the formation of few-wall CNT coils and characterize their structural, optical, vibrational, and electrical properties using experimental and computational tools. The coils are made of CNTs with 2, 3, or 4 walls. They have accessible ends for electrical contacts and low defect densities. The coil diameters are on the order of one micron, like those of single-wall CNT coils, despite the higher rigidity of few-wall CNTs. Coils with as many as 163 turns were found, with their turns organized in a rippled raft configuration. These coils are promising candidates for a variety of miniature devices based on electromagnetic coils, such as electromagnets, inductors, transformers, and motors. Being chirally and enantiomerically pure few-wall CNT bundles, they are also ideal for fundamental studies of interwall coupling and superconductivity in CNTs.

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Electronic transport properties of inner and outer shells in near ohmic-contacted double-walled carbon nanotube transistors

Cited by 7 publications

References 36 publications

Theoretical study on the electronic structure nature of single and double walled carbon nanotubes and its role on the electron transport

Theoretical study on the electronic structure nature of single and double walled carbon nanotubes and its role on the electron transport

A Meta‐Analysis of Conductive and Strong Carbon Nanotube Materials

Few-Wall Carbon Nanotube Coils

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