Atomic structure of carbon nanotubes from scanning tunneling microscopy

Venema, Liesbeth; Meunier, Vincent; Lambin, Ph.; Dekker, Cees

doi:10.1103/physrevb.61.2991

Cited by 176 publications

(147 citation statements)

References 28 publications

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“…The geometry of the tip apex results in convolution effects, producing an apparent broadening of the nanotube, whereas the circular shape of the tube, combined with the tendency of the tunneling current to follow the shortest path, induces distortions in the STM image of the nanotube lattice, making it to appear stretched in the direction perpendicular to the tube. [18][19][20] Generally, for an accurate diameter determination, models for deconvoluting the tip contribution are employed, 21 which might not yield a very precise determination in the present case due to the noncircular shape of the nanotube and to the unknown geometry of the STM tip.…”

Section: Resultsmentioning

confidence: 99%

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Atomic and electronic structure in collapsed carbon nanotubes evidenced by scanning tunneling microscopy

2007

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The electronic behavior of a radially collapsed armchair carbon nanotube encountered by scanning tunneling microscopy experiments is presented in a study that probes the electronic changes directly associated with the atomically resolved structural perturbations. The finite density of states obtained through scanning tunneling spectroscopy at the Fermi energy when the interspacing of the flattened faces does not allow for bond formation suggests that the electronic properties are slightly modified under mild radial deformations and provides a striking verification of previous theoretical predictions and discussions. The study clearly illustrates the challenges to be faced in the contacting of future nanowires, predicted to be the active component in integrated circuits.

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Section: Resultsmentioning

confidence: 99%

“…␥ 0 is the value of the nearest neighbor overlap integral, ranging from 2.4 to 2.9 eV. 19,26,27 The range of diameters so obtained for the currently investigated nanotube is from 2.5 to 3 nm for a 0.8 eV separation, assuming that the positions of the Van Hove singularities are not affected by the radial deformation.…”

Section: Fig 3 ͑Color Online͒mentioning

confidence: 99%

Atomic and electronic structure in collapsed carbon nanotubes evidenced by scanning tunneling microscopy

2007

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“…The chiral indexes ͑n , m͒ of the investigated SWNTs were determined from the measurements of the chiral angle and an estimation of the SWNT band-gap energy from STS spectra 43 compared with the one derived from tight-binding calculations taking into account the curvature effects. 44 For the SWNTs discussed in Secs.…”

Section: B Sample Preparationmentioning

confidence: 99%

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

et al. 2009

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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.

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“…The STM image shows an array of closely packed bright dots, being consistent with earlier reports. 32 When 4AT tips (Fig. 12(c)), instead of conventional metal tips, were used, we observed protrusions brighter than the perfectly aligned carbon atoms (Fig.…”

Section: Visualization Of Atomic Defects In Carbon Nanotubesmentioning

confidence: 83%

Recognition of Chemical Identity of Organic Adsorbates on Solid Surfaces at the Nanoscale by Molecular STM Tips

Nishino

Umezawa

2010

ANAL. SCI.

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1023 IntroductionRecent interest in functional nanomaterials, such as molecular electronics and miniaturized sensors, increasingly demands atomic-and molecular-resolution analytical tools. Scanning tunneling microscopy (STM) is one of the most suitable techniques for this purpose, because it offers a unique opportunity to directly reveal surface topography as well as electronic structure at the nanoscale. It is, however, often 2010 © The Japan Society for Analytical Chemistry This paper reviews chemically selective imaging at the single-atom/molecule level by molecular STM tips. The molecular tips enable the recognition of a particular chemical species on the basis of chemical interactions with a sample molecule, including hydrogen-bond, metal-coordination, and charge-transfer interactions. The chemical selectivity can be tailored by designing functional groups of the tip molecules. Moreover, the rational design of the molecular tip allows sophisticated chemical recognition. The discrimination of DNA bases and chiral recognition on a single molecule basis are thereby achieved. The molecular tips also revealed rectified electron transmission within an electron donor-acceptor molecular pair. Self-assembled monolayers, carboxylated carbon nanotube, and conducting polymers can be utilized for the preparation of molecular tips. This technique may be coined "intermolecular tunneling microscopy" as its principle goes, and is of general significance for novel molecular imaging of chemical identities at the membrane and solid surfaces.

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Atomic structure of carbon nanotubes from scanning tunneling microscopy

Cited by 176 publications

References 28 publications

Atomic and electronic structure in collapsed carbon nanotubes evidenced by scanning tunneling microscopy

Atomic and electronic structure in collapsed carbon nanotubes evidenced by scanning tunneling microscopy

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

Recognition of Chemical Identity of Organic Adsorbates on Solid Surfaces at the Nanoscale by Molecular STM Tips

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