Electronic Effects of Oxygen Adsorption on Carbon Nanotubes

Collins, Philip G.; Ishigami, Masa; Zettl, Alex

doi:10.1142/9789812793805_0052

Cited by 208 publications

(281 citation statements)

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“…This minority species may be located either at defect sites on the SWNT bundles as suggested previously or at tube-metal contacts in electronic devices. 1,14 The time constants, characteristic of the changes following degassing or oxygen doping of SWNT samples at high pressure and at high temperatures ranging from seconds to minutes, 4,5 are likewise indicative of a strongly bound minority species that is responsible for changes in the conductivity of SWNT samples.…”

Section: Resultsmentioning

confidence: 99%

“…Evidence for O 2 -induced doping is provided by recent studies that find that the exposure of SWNT samples and devices to O 2 appears to have a strong influence on their electronic-transport properties. 5 Chemical doping requires at least a weak chemical bond to facilitate charge transfer from the substrate to the lowest unoccupied orbital of adsorbed oxygen. Ab initio calculations of O 2 interactions with different tube types performed within the local-density approximation ͑LDA͒ yield binding energies ranging from 3.7 to 24.1 kJ/mol ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

“…11 It is, therefore, still discussed controversially which microscopic processes lead to the observed changes in the electronic-transport properties of SWNT's. Apart from the aforementioned chemical doping, 3,4,5,12 it has also been proposed that doping of the tube-metal contacts is responsible for changes in the transport properties. 1,13,14 It also remains unclear whether atomic or molecular oxygen is responsible for the charge transfer that is necessary for doping-let it be at contacts or on the tube surfaces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Ulbricht

Moos²,

Hertel³

2002

Phys. Rev. B

185

138

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We present a study on the kinetics of oxygen adsorption and desorption from single-wall carbon nanotube ͑SWNT͒ and highly oriented pyrolytic graphite ͑HOPG͒ samples. Thermal-desorption spectra for SWNT samples show a broad desorption feature peaked at 62 K, which is shifted to a significantly higher temperature than the low-coverage desorption feature on HOPG. The low-coverage O 2 binding energy on SWNT bundles ͑18.5 kJ/mol͒ is 55% higher than that for adsorption on HOPG ͑12.0 kJ/mol͒. In combination with molecular mechanics calculations we show that the observed binding energies for both systems can be attributed to van der Waals interactions, i.e., physisorption. The experiments provide no evidence for a more strongly bound chemisorbed species or for dissociative oxygen adsorption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Ulbricht

Moos²,

Hertel³

2002

Phys. Rev. B

185

138

View full text Add to dashboard Cite

show abstract

“…Experiments and calculations have shown that oxygen adsorbed onto the surface of a nanotube depletes the valence band, making the nanotube a p-type semiconductor. 17,18 Other molecules in the environment can also introduce free charge carriers ͑usually holes͒ to the nanotube. 19 Additionally, the two-exciton recombination process described above could generate a small number of free charge carriers in an undoped nanotube.…”

Section: B Exciton-electron Recombinationmentioning

confidence: 99%

Nonradiative recombination of excitons in carbon nanotubes mediated by free charge carriers

Kinder

Mele

2008

Phys. Rev. B

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Free electrons or holes can mediate the nonradiative recombination of excitons in carbon nanotubes. Kinematic constraints arising from the quasi one-dimensional nature of excitons and charge carriers lead to a thermal activation barrier for the process. However, a model calculation suggests that the rate for recombination mediated by a free electron is the same order of magnitude as that of two-exciton recombination. Small amounts of doping may contribute to the short exciton lifetimes and low quantum yields observed in carbon nanotubes.

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“…This means that the electronic properties of these systems depend crucially on the nanotube quality. This dependence is mainly due to the presence of absorbed molecules 5 and vacancies or defects 6 as they deteriorate their electronic and thermal properties. Therefore it is important to find experimental methods which help to improve the nanotube quality and improve their electron field emission properties.…”

Section: Introductionmentioning

confidence: 99%

Microscopic investigation of laser-induced structural changes in single-wall carbon nanotubes

et al. 2007

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Extensive excited-state molecular dynamics simulations of femtosecond laser-induced structural transformation in single-walled carbon nanotubes ͑SWNTs͒ are presented. We considered in the simulation two limiting cases; one where only a short portion of the tube is irradiated and the other where the whole tube is affected by the laser pulse. We have analyzed the role of chirality ͑zigzag versus armchair and some chiral tube cases͒ in the damage threshold as a function of tube diameter. Nontrivial dependence of the damage threshold as a function of diameter has been found. We find that for equal laser parameters, zigzag SWNTs are on average equally stable with respect to laser excitation as armchair SWNTs, but their stabilities show different dependencies on diameter. Due to the higher stiffness of the ͑n , n͒ tubes in the direction perpendicular to its axis as compared to the ͑n ,0͒ tubes, we find the formation of standing waves in the nanotube wall for zigzag and not for armchair tubes. We also studied the role of the laser pulse duration and show that in general longer laser pulses increase the damage threshold. This result is rationalized in terms of electron-ion relaxation times. Implications of laser-induced structural transformations are analyzed.

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Electronic Effects of Oxygen Adsorption on Carbon Nanotubes

Cited by 208 publications

References 0 publications

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Nonradiative recombination of excitons in carbon nanotubes mediated by free charge carriers

Microscopic investigation of laser-induced structural changes in single-wall carbon nanotubes

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