Direct observation of confined states in metallic single-walled carbon nanotubes

Maltezopoulos, Theophilos; Kubetzka, André; Morgenstern, Markus; Wiesendanger, R.; Lemay, Serge G.; Dekker, Cees

doi:10.1063/1.1598282

Cited by 43 publications

(36 citation statements)

References 20 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various defects in CNTs are widely observed in experiments. 23,24 We chose a section of a (5, 5) SWNT to study the change in stability of defects as a function of their distance from the open end of the nanotube. As shown in panel 0…”

Section: Methods Of the Theoretical Studymentioning

confidence: 99%

Theoretical study of the stability of defects in single-walled carbon nanotubes as a function of their distance from the nanotube end

Ding

2005

Phys. Rev. B

View full text Add to dashboard Cite

Point defects, including atom vacancies, add atom and Stone-Wale defects, close to a (5, 5) single-walled carbon nanotube (SWNT) open end were studied by DFT, semiempirical PM3 methods and the empirical Brenner potential. It is found that defect stability increases at they become closer to the SWNT open end. Based on these results, a model for removing defects in a growing SWNT is proposed, where the defects diffuse to the SWNT end. Furthermore, the calculations show that the semiempirical PM3 method compares well with DFT results, and is accurate enough for studying defect formation in SWNTs. In contrast, the empirical Brenner potential yields large errors and is sometimes not even qualitatively correct.

show abstract

Section: Methods Of the Theoretical Studymentioning

confidence: 99%

Theoretical study of the stability of defects in single-walled carbon nanotubes as a function of their distance from the nanotube end

Ding

2005

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Moreover, defects in SWNTs have been shown to be useful for achieving the desired functionality. In particular, it was demonstrated that intrinsic defects in metallic SWNTs embodied in source-drain-gate devices can provide resonant backscattering characteristics 8,9 leading to low-temperature quantum dot devices, as well as a high gate sensitivity at the defect position. 10 Thus, the knowledge of how and to which extent different types of defects can change the electronic properties of SWNTs is important, as it may open a route toward controllable engineering of the properties of SWNT-based electronic devices or even result in the appearance of a different class of devices with the properties entirely designed by a controlled creation of particular defects.…”

Section: Introductionmentioning

confidence: 99%

Modifying the electronic structure of semiconducting single-walled carbon nanotubes byAr+ion irradiation

et al. 2009

View full text Add to dashboard Cite

Local controllable modification of the electronic structure of carbon nanomaterials is important for the development of carbon-based nanoelectronics. By combining density-functional theory simulations with Arion-irradiation experiments and low-temperature scanning tunneling microscopy and spectroscopy ͑STM/STS͒ characterization of the irradiated samples, we study the changes in the electronic structure of single-walled carbon nanotubes due to the impacts of energetic ions. As nearly all irradiation-induced defects look as nondistinctive hillocklike features in the STM images, we compare the experimentally measured STS spectra to the computed local density of states of the most typical defects with an aim to identify the type of defects and assess their abundance and effects on the local electronic structure. We show that individual irradiationinduced defects can give rise to single and multiple peaks in the band gap of the semiconducting nanotubes and that a similar effect can be achieved when several defects are close to each other. We further study the stability of defects and their evolution during STM measurements. Our results not only shed light on the abundance of the irradiation-induced defects in carbon nanotubes and their signatures in STS spectra but also suggest a way the STM can be used for engineering the local electronic structure of defected carbon nanotubes.

show abstract

“…Understanding the properties of these defects has become an essential part of such diverse processes in carbon materials such as strain, 1 lithium storage in nanotube based batteries, 2 catalytic growth, 3 junctions, 4 and quantum dot creation. 5,6 Studies of radiation effects 7 in graphite and other carbon nanostructures and experiments on as-grown nanotubes 5,8 have demonstrated that intrinsic carbon defects are a common phenomenon in standard samples. One of the most common intrinsic defects created is the carbon vacancy-adatom pair, 7 and therefore it is important to study the influence this kind of defect will have on the surface physical and electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of adatoms on carbon nanotubes

et al. 2004

View full text Add to dashboard Cite

We use ab initio methods to calculate the physical and electronic properties of carbon adatoms on different characteristic carbon nanotubes. We found that for every tube the energetically favored adsorption geometry is a ''bridgelike'' structure between two surface carbons, perpendicular to the long axis of the tube. For adsorption perpendicular or parallel to the axis, the calculations show that the adatom is spin polarized, although the magnitude of the magnetic moment depends mainly on the electronic structure of the nanotube itself.

show abstract

Direct observation of confined states in metallic single-walled carbon nanotubes

Cited by 43 publications

References 20 publications

Theoretical study of the stability of defects in single-walled carbon nanotubes as a function of their distance from the nanotube end

Theoretical study of the stability of defects in single-walled carbon nanotubes as a function of their distance from the nanotube end

Modifying the electronic structure of semiconducting single-walled carbon nanotubes byAr+ion irradiation

Structure and magnetic properties of adatoms on carbon nanotubes

Contact Info

Product

Resources

About