Selective sorting of metallic/semiconducting single-walled carbon nanotube arrays by ‘igniter-assisted gas-phase etching’

2018 ◽  
Vol 2 (1) ◽  
pp. 157-162 ◽  
Author(s):  
Qiuchen Zhao ◽  
Zequn Wang ◽  
Lianming Tong ◽  
Zhe Zheng ◽  
Wenping Hu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Small Molecules ◽  
Gas Phase ◽  
Single Walled Carbon Nanotubes ◽  
Nanotube Arrays ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Carbon Nanotube Arrays ◽  
Walled Carbon Nanotubes

Small molecules are used as “igniters” for the selective sorting of metallic/semiconducting single-walled carbon nanotubes by a gas phasing etching process.

Highly efficient thermophones based on freestanding single-walled carbon nanotube films

2019 ◽  
Vol 4 (5) ◽  
pp. 1158-1163 ◽  
Author(s):  
Stepan A. Romanov ◽  
Ali E. Aliev ◽  
Boris V. Fine ◽  
Anton S. Anisimov ◽  
Albert G. Nasibulin
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
State Of The Art ◽  
Single Walled Carbon Nanotubes ◽  
The State ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Highly Efficient ◽  
Art Performance ◽  
Walled Carbon Nanotubes

We present the state-of-the-art performance of air-coupled thermophones made of thin, freestanding films of randomly oriented single-walled carbon nanotubes (SWCNTs).

Photochemical generation of bis-hexahapto chromium interconnects between the graphene surfaces of single-walled carbon nanotubes

2015 ◽  
Vol 2 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Aron Pekker ◽  
Mingguang Chen ◽  
Elena Bekyarova ◽  
Robert C. Haddon
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Photochemical Generation ◽  
Carbon Nanotube Junctions ◽  
Walled Carbon Nanotubes

The linkage of single-walled carbon nanotube junctions by the photochemistry of organometallic chromium reagents produces dramatic increases in network conductivity.

Single-walled carbon nanotubes as optical probes for bio-sensing and imaging

2017 ◽  
Vol 5 (32) ◽  
pp. 6511-6522 ◽  
Author(s):  
Jing Pan ◽  
Feiran Li ◽  
Jong Hyun Choi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Biomedical Imaging ◽  
Single Walled Carbon Nanotubes ◽  
Optical Probes ◽  
Biomolecular Sensing ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

A review on the applications of single-walled carbon nanotube photoluminescence in biomolecular sensing and biomedical imaging.

Chemical structures and physical properties of vanadium oxide films modified by single-walled carbon nanotubes

2016 ◽  
Vol 18 (3) ◽  
pp. 1422-1428 ◽  
Author(s):  
Qiong He ◽  
Xiangdong Xu ◽  
Meng Wang ◽  
Minghui Sun ◽  
Yadong Jiang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Physical Properties ◽  
Vanadium Oxide ◽  
Composite Films ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Chemical Structures ◽  
Walled Carbon Nanotubes

A series of vanadium oxide (VOx)–single-walled carbon nanotube (SWCNT) composite films with different SWCNT concentrations were prepared and systematically investigated. The critical SWCNT concentrations for modification of VOx films were experimentally deduced.

Aligned fluorinated single-walled carbon nanotubes as a transmission channel towards attenuation of broadband electromagnetic waves

2018 ◽  
Vol 6 (35) ◽  
pp. 9399-9409 ◽  
Author(s):  
Yang Liu ◽  
Yichun Zhang ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electromagnetic Waves ◽  
Single Walled Carbon Nanotubes ◽  
Transmission Channel ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Strong Electrostatic Interaction ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Highly fluorinated single-walled carbon nanotubes tend to be oriented under stress due to strong electrostatic interaction allowing directional propagation and then effective attenuation of electromagnetic waves by pristine single-walled carbon nanotube networks.

scholarly journals Chirality effects on an electron transport in single-walled carbon nanotube

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
J. Charoenpakdee ◽  
Ongart Suntijitrungruang ◽  
S. Boonchui
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Charge Transport ◽  
Spin Polarization ◽  
Low Frequency ◽  
Single Walled Carbon Nanotubes ◽  
Negative Wave ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Abstract In our work, we investigate characteristics of conductivity for single-walled carbon nanotubes caused by spin–orbit interaction. In the case study of chirality indexes, we especially research on the three types of single-walled carbon nanotubes which are the zigzag, the chiral, and the armchair. The mathematical analysis employed for our works is the Green-Kubo Method. For the theoretical results of our work, we discover that the chirality of single-walled carbon nanotubes impacts the interaction leading to the spin polarization of conductivity. We acknowledge such asymmetry characteristics by calculating the longitudinal current–current correlation function difference between a positive and negative wave vector in which there is the typical chiral-dependent. We also find out that the temperature and the frequency of electrons affect the function producing the different characteristics of the conductivity. From particular simulations, we obtain that the correlation decrease when the temperature increase for a low frequency of electrons. For high frequency, the correlation is nonmonotonic temperature dependence. The results of the phenomena investigated from our study express different degrees of spin polarization in each chiral of single-walled carbon nanotube and significant effects on temperature-dependent charge transport according to carrier backscattering. By chiral-induced spin selectivity that produces different spin polarization, our work could be applied for intriguing optimization charge transport.

Radial Waves Propagation in a Single-Walled Carbon Nanotube with Surface Irregularity

2021 ◽  
Vol 16 (1) ◽  
pp. 97-103
Author(s):  
Mahmoud. M. Selim
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Phase Velocity ◽  
Single Walled Carbon Nanotubes ◽  
Surface Irregularity ◽  
Structural Element ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Knowledge Propagation ◽  
Walled Carbon Nanotubes

This work is an attempt to study the propagation of radial waves in an irregular single-walled carbon nanotube (ISWCNT). The characteristics equation of phase velocity of radial waves is derived using cylindrical thin shell theory. Taking into account the effects of the surface irregularity, dispersion curves are plotted and the effectiveness of surface irregularity is confirmed by comparing the obtained numerical results with those in cases of propagation of radial waves in uniform nanotube. The results turn out that, the phase velocity of radial waves is dependent on the surface irregularity and it is increasing with an increase of surface irregularity parameter. To the author best knowledge, propagation of radial waves in the irregular single-walled carbon nanotubes has not yet been studied, and the present work is an attempt to find out the dispersion relation of radial waves in ISWCNTs. Finally, the present results may serve as useful references for the application and the design of nano oscillators and nanodevices, in which single-walled carbon nanotubes act as the most prevalent nanocomposite structural element.

Determination of fundamental coupled torsional—radial frequency of single-walled carbon nanotubes

2020 ◽  
pp. 107754632098134
Author(s):  
Sneha Singh
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Shear Modulus ◽  
Vibration Frequency ◽  
Single Walled Carbon Nanotubes ◽  
Radial Vibration ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Research indicates that single-walled carbon nanotubes have a unique coupled torsional–radial vibration as one of their fundamental modes. Determination of their vibration frequency is required for efficient use of single-walled carbon nanotube in nano-electromechanical systems. However, there is no mathematical expression for these frequencies and their dependence on single-walled carbon nanotube geometry is unknown. This article examines the effect of diameter, length, and chirality on the fundamental coupled torsional–radial vibration frequency of single-walled carbon nanotube using molecular–structural–mechanics–approach, finite element analysis, and regression analyses. Consequently, a first-ever mathematical form of this frequency is derived. The form quickly and accurately predicts these frequencies at 1.5% in-sample, and 7.2% out-sample mean absolute percentage error. single-walled carbon nanotubes’ fundamental coupled torsional–radial vibration frequency is found independent of diameter and inversely proportional to length where the proportionality constant depends on chirality. The coupling of modes and the similarity of the frequency form with cylindrical shell suggest that single-walled carbon nanotube behave like thin shells in these vibrations. A form for effective circumferential shear modulus of single-walled carbon nanotube is also derived. This modulus is found to depend only on the chirality where achiral single-walled carbon nanotubes have higher values than chiral single-walled carbon nanotubes. Proposed mathematical forms can be used for characterization of single-walled carbon nanotubes, determination of single-walled carbon nanotubes’ effective shear modulus, and tuning operational frequency of single-walled carbon nanotube-based nano-electromechanical systems.

DEFECT–DEFECT INTERACTION IN SINGLE-WALLED CARBON NANOTUBES UNDER TORSIONAL LOADING

2010 ◽  
Vol 24 (10) ◽  
pp. 1215-1226 ◽  
Author(s):  
ABUL M. A. HUQ ◽  
ABUHANIF K. BHUIYAN ◽  
KIN LIAO ◽  
KHENG LIM GOH
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Angular Displacement ◽  
Single Walled Carbon Nanotubes ◽  
Torsional Loading ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Defect Interaction ◽  
Bond Stretching ◽  
Walled Carbon Nanotubes

This paper presents an analysis of interactions between a pair of Stone–Wales (SW) defects in a single-walled carbon nanotube (SWCNT) that has been subjected to an external torque. Defect pairs, representing the different combinations of SW defect of A (SW-A) and B (SW-B) modes, were incorporated in SWCNT models of different chirality and diameter and solved using molecular mechanics. Defect–defect interaction was investigated by evaluating the C–C steric interactions in the defect that possesses the highest potential energy, E, as a function of inter-defect distance, D. This study reveals that the deformation of the C–C bond is attributed to bond stretching and bending. In the SW-B defects, there is an additional contributor arising from the dihedral angular deformation. The magnitude of E depends on the type of defect but the profile of the E versus D curve depends on the orientation of the defects. The largest indifference length, D0, beyond which two defects cease to interact, is approximately 30 Å. When the angular displacement of the tube increases two-fold, E increases, but the profile of the E versus D curve is not affected. The sense of rotation affects the magnitude of E but not the profile of the E versus D curve.

Twisting of Single-Walled Carbon Nanotube Bundles

1999 ◽  
Vol 593 ◽  
Author(s):  
Lu-Chang Qin ◽  
Sumio Iijima
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Laser Ablation ◽  
Total Energy ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Bundles ◽  
Lower Total Energy ◽  
Walled Carbon Nanotubes

ABSTRACTBundles of single-walled carbon nanotubes produced by laser ablation are often seen twisted in morphology, forming nanoropes which would better suit the function for improvement of structural stability in mechanical applications. The rope-like configuration is explained with a model that relates the twisting morphology to the helicity difference between the neighboring nanotubes. This selfassembly phenomenon is attributed to the fact that a twisted structure has lower total energy compared with the raft-like parallel bundles when the helicities of neighboring nanotubes are different.

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