Can photo excitations heal defects in carbon nanotubes?

Miyamoto, Yoshiyuki; Berber, Savaş; Yoon, Mina; Rubio, Ángel; Tománek, David

doi:10.1016/j.cplett.2004.05.070

Cited by 26 publications

(25 citation statements)

References 22 publications

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“…19 Figure 1 shows a relaxed monoatomic vacancy (i.e., three two-coordinate carbon atoms are produced) structure in a (3,3) carbon nanotube (top) and a graphene sheet (bottom). 14 Miyamoto et al 15 reported the feasibility of healing defects in carbon nanotubes using photo excitation. They found out that, electronically excited nanotubes with monatomic vacancies show an unexpected self-healing ability associated with the possibility to form new bonds bridging the vacancy site, which in turn is linked to their nanometer size.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18] Even though it is widely agreed that the as-grown carbon nanotubes have relatively few defects; nevertheless, defects can appear at the purification stages. Defects may also form during chemical treatment while aiming at a desired functionality.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the initial gap bridged by the newly formed bond between the atoms adjacent to vacancy restores part of the structural rigidity and saturates some of the dangling bonds at the vacancy site. 15 Thermal reduction is another technique that can be utilized to purify single-walled carbon nanotubes and to reduce the chemical defects from their lattice structure. Tran and Lambrakos 20 showed that over 90% of the carbonaceous impurities, formed during the synthesis of Single-Walled Carbon Nanotubes (SWCNTs) by carbon arc and laser ablation, can efficiently be eliminated by a thermal reduction technique, which is mainly comprised of high-temperature reactions of SWCNTs in a pressurized hydrogen chamber followed by a slow annealing under vacuum condition.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Vacancy Defects on Mechanical Properties of Graphene/Carbon Nanotubes: A Numerical Modeling

Askari¹,

Ghasemi‐Nejhad²

2011

Jnl of Comp & Theo Nano

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The unique mechanical, physical, and chemical properties of carbon nanotubes and graphene project them as seemless and stand alone materials with performances much better than other metallic and nonmetallic materials in wide variety of applications. Due to their perfect hexagonal lattice structural configuration, electrons can be transmitted without resistance, heat can be conducted even better than in diamond, and loads are carried out and transferred more efficient than in high strength steels. However, carbon nanotubes and graphene sheets are not free of structural defects, which are basically induced during their processing and purification stages. Owing to the fact that defects exist in different configurations and they can considerably influence the performance and properties of carbon nanotubes and graphene, they are not always undesirable. Therefore, with increased interests in functionalization of carbon nanotubes and graphene, detailed studies and investigations regarding the effects of such vacancy defects, due to the absence of carbon atoms from the lattice structure, on their properties warrants a detailed investigation. Nevertheless, the advantages and disadvantages of the presence of vacancy defects strongly depend on their applications. In this work, an attempt is made to numerically model and analyze the effects of vacancy defects of carbon nanotubes and graphene sheets on their effective mechanical properties. The effects of these defects in different configurations of carbon nanotubes and graphene sheets are (i.e., armchair, chiral, and zig-zag, depending on the direction of applied load) reported. A detailed finite element analysis has been performed to predict their axial mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Vacancy Defects on Mechanical Properties of Graphene/Carbon Nanotubes: A Numerical Modeling

Askari¹,

Ghasemi‐Nejhad²

2011

Jnl of Comp & Theo Nano

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“…The advantage of the approach is that it explicitly takes into account the electronic structure of the target and thus discriminates among different carbon allotropes, including diamond and graphite. In addition to irradiation simulations, the method has proven useful to describe photo-chemical processes 222 and understand the damping mechanism of electronic excitations 223 in carbon nanotubes.…”

Section: F Time-dependent Dft Simulationsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

936

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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“…The simplest point defect in single-wall carbon nanotubes (SWCNTs) is the monovacancy, the most common defect resulting from energetic particle irradiation above the atomic displacement threshold [9]. A monovacancy results from removal of a single carbon atom leaving three dangling bonds in an unstable structure which reconstructs, with a small barrier (%0:3 eV in a (3,3) SWCNT [10]), to form a pentagonal ring and a single dangling bond, known as a 5-1db defect [11] (see Fig. 1).…”

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confidence: 99%

Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes

Hunt

Clark

2012

Phys. Rev. Lett.

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. (2012) Reprinted with permission from the American Physical Society: Physical Review Letters 109, 265502 c 2012 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Can photo excitations heal defects in carbon nanotubes?

Cited by 26 publications

References 22 publications

Effects of Vacancy Defects on Mechanical Properties of Graphene/Carbon Nanotubes: A Numerical Modeling

Effects of Vacancy Defects on Mechanical Properties of Graphene/Carbon Nanotubes: A Numerical Modeling

Ion and electron irradiation-induced effects in nanostructured materials

Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes

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