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

Ren, Wencai; Li, Feng; Cheng, Hui‐Ming

doi:10.1063/1.1628045

Cited by 2 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that the C v value decreases as the size of the SWCNT increases. These results are in line with other theoretical and experimental data. ,− The simulation of TWCNTs were also performed using an NVT ensemble with the same procedure (although the edges of the hexagonal-prism box were modified to about 19.7 Å; see section 3.2). Of the two simulations performed in this part (listed in Table ), 9@30@39 and 21@30@39* imitate the cases of 9@30 and 21@30* for DWCNTs, respectively.…”

Section: Resultssupporting

confidence: 82%

“…The simulated specific heat of 21@30* ( C v = 1.01 J/g·K), which represents a natural DWCNT, , shows good agreement with the experimental specific heat capacity measured for the naturally synthesized CNTs (1.085 J/g·K for the DWCNT). This is true also for the simulated SWCNT compared with that measured experimentally ( C v = 0.65 and 0.62 J/g·K, respectively).…”

Section: Resultssupporting

confidence: 73%

See 1 more Smart Citation

Simulation of a Patterned Core–Shell Double-Walled Carbon Nanotube with an Optimal Heat Capacity as Efficient Thermal Conductivity Modules

Behrouz

Ghatee

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

We performed molecular dynamics simulations to determine the equilibrium configuration of designed double-walled carbon nanotubes (DWCNTs) and bundle carbon nanotubes. With the nanotubes in the zigzag structure, the potential energy of the interaction between the core and shell tubes patterned at different inner-tube sizes was investigated. Thermodynamic properties such as the heat capacity and relative orientation of the inner/outer tubes in DWCNTs were computed and elucidated. Our simulations, consistent with the experimental results, also predicted a particular core−shell configuration with a higher surface energy and, hence, a higher heat capacity (about 2 times) compared to the normal DWCNT configuration. The interaction potential energy between the pair of core and shell tubes predicts a van der Waals depth, spanning a circular path, and indicates the accessibility to a higher number of configurational states as the radius of the inner tube decreases. The final cross sections of the patterned coaxis DWCNTs are distorted, and their shapes lead to asymmetric tubes with oval shapes. These configurations agree with other observations reported in theoretical and experimental investigations. Single-walled and patterned triple-walled carbon nanotubes (SWCNTs and TWCNTs) were simulated to confirm and make a sound baseline for DWCNTs. This was included also the simulation of SWCNTs, DWCNTs, and TWCNTs with metallic and semiconducting features. Technologically made available such core−shell nanotubes materials as conductors of electricity would find efficient usage in the applications like microelectronic devices that are encountered with issues of high heat dissipation and thermal conductivity rates.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 73%

Simulation of a Patterned Core–Shell Double-Walled Carbon Nanotube with an Optimal Heat Capacity as Efficient Thermal Conductivity Modules

Behrouz

Ghatee

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The sulfur addition amount was ∼1.00 × 10 -4 mol/min. It is apparent that some high-frequency radial breathing mode (RBM) peaks appear with the temperature increasing from 1100 to 1180 °C, indicating that some DWNTs were formed in the product. ,,,,− Moreover, in this case, no substantial diameter change was found. These results can also be verified by the change of the line shapes and frequencies of the G -band and G ‘-band profiles. , These results are consistent with the above predictions based on the proposed growth model, indicating the reasonableness of this growth model.…”

Section: Resultsmentioning

confidence: 79%

Evidence for, and an Understanding of, the Initial Nucleation of Carbon Nanotubes Produced by a Floating Catalyst Method

Ren

Cheng

2006

J. Phys. Chem. B

View full text Add to dashboard Cite

An understanding of the growth mechanism of carbon nanotubes (CNTs) is very important for the control of their structures, which in turn will be the basis for their further theoretical studies and applications. On the basis of high-resolution transmission electron microscopy observations of the initial nucleation of CNTs, the following deductions are made: (1) the nucleation of single-walled carbon nanotubes (SWNTs) and double-walled carbon nanotubes (DWNTs) starts at a low-temperature zone in front of the reaction zone; (2) the addition of sulfur results in localized liquid zones on the surface of big catalyst particles as the initial nucleation sites; (3) a temperature gradient is necessary to realize the role of sulfur in the structure of CNTs; and (4) the shell number of CNTs can be changed at the nucleation and growth stages. On the basis of the above, a growth model for the formation of SWNTs and DWNTs is proposed, which might open up the possibility of controlling the structure of CNTs.

show abstract

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

Cited by 2 publications

References 15 publications

Simulation of a Patterned Core–Shell Double-Walled Carbon Nanotube with an Optimal Heat Capacity as Efficient Thermal Conductivity Modules

Simulation of a Patterned Core–Shell Double-Walled Carbon Nanotube with an Optimal Heat Capacity as Efficient Thermal Conductivity Modules

Evidence for, and an Understanding of, the Initial Nucleation of Carbon Nanotubes Produced by a Floating Catalyst Method

Contact Info

Product

Resources

About