Higher Coverage Gas Adsorption on the Surface of Carbon Nanotubes: Evidence for a Possible New Phase in the Second Layer

Talapatra, Saikat; Krungleviciute, Vaiva; Migone, Aldo

doi:10.1103/physrevlett.89.246106

Cited by 63 publications

(68 citation statements)

References 25 publications

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“…(Talapatra and Migone 2001) for a sample mass of 290 mg (see Ref. Talapatra et al 2002). Moreover, data from literature show a much larger spread of values for different synthesis techniques, for instance for HiPCO samples, as discussed later.…”

Section: Argon Adsorptionmentioning

confidence: 92%

Characterization of two single-wall carbon nanotubes samples by Ar and Kr adsorption isotherms

Goudon

Lasjaunias

2007

Adsorption

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We investigated by Ar and Kr adsorption isotherm techniques for two kinds of carbon single-wall nanotube bundles prepared by different synthesis methods. Despite the difference in the adsorption capacity in the two samples, the adsorption mechanisms are similar, which indicates that the same adsorption sites are involved for Ar and Kr. We have already measured a similar difference in the adsorbed amount in these samples studied by a low-temperature heatcapacity technique, i.e., for the case of 4 He as adsorbate. These results cannot be easily explained by only taking into account the topology of the bundles if all tubes are closedended. A larger spread of effective surface areas among different sources of samples is reported in the literature data.

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Section: Argon Adsorptionmentioning

confidence: 92%

Characterization of two single-wall carbon nanotubes samples by Ar and Kr adsorption isotherms

Goudon

Lasjaunias

2007

Adsorption

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“…Progress has been made in the study of physisorbed films on SWNTB, both theoretically and experimentally. Reviews of early theoretical developments by Calbi et al 16 and of much of the experimental work by Talapatra et al 17,18 are available.…”

Section: Introductionmentioning

confidence: 98%

Thermodynamic measurements of the first layer of Ne adsorbed on closed-end single-walled carbon nanotube bundles

Ramachandran

Vilches

2007

Phys. Rev. B

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We report the results of thermodynamic measurements done on Ne films adsorbed on HiPCo™ singlewalled, closed-end, purified carbon nanotube bundles. The heat capacity was measured for 17 coverages between 0.015 and 1.14 single atomic layers for 1.8 K Ͻ T Ͻ 19 K. A few complementary adsorption isotherms were measured on the same cell over a similar range of coverages for 18.1 K Ͻ T Ͻ 29.5 K. Our results indicate that Ne deposits, in order, in high binding energy sites, the grooves on the outside of the bundles, the surface of the outer nanotubes, and after compressing the full monolayer, on a second layer. All of the films show solidlike behavior in the range studied. For the lowest coverage films, we compare our results to theoretical estimates and calculate the one-dimensional Debye temperature. For the higher coverage films, we calculate two-dimensional Debye temperatures and compare to results obtained on Ne adsorbed on flat graphite ͑Grafoil™͒. We estimate the two-dimensional ͑2D͒ compressibility of the films near monolayer completion from the vapor pressure isotherms. Agreement is found between the monolayer completion coverage inferred from heat-capacity isotherms and a minimum in the compressibility. In spite of the solidlike behavior and similarities to Ne/graphite, we do not observe any phase transition in the range of temperatures and coverages studied, which overlaps with the sublimation, melting, and vaporization transitions of 2D Ne.

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“…1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 This subject has been reviewed recently. 13,14 The adsorption of these gases can occur within the tubes only if they are open, which is possible either during the process of nanotube formation (e.g., when endohedral C 60 molecules are formed), 15 or after chemical treatment to open the tubes.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties and correlation functions of Ar films on the surface of a bundle of nanotubes

et al. 2005

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We employ canonical Monte Carlo simulations to explore the properties of an Ar film adsorbed on the external surface of a bundle of carbon nanotubes. The study is concerned primarily with three properties: specific heat c(T ), differential heat of adsorption q d , and Ar-Ar correlation functions g(r). These measurable functions exhibit information about the dependence of film structure on coverage and temperature.

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Higher Coverage Gas Adsorption on the Surface of Carbon Nanotubes: Evidence for a Possible New Phase in the Second Layer

Cited by 63 publications

References 25 publications

Characterization of two single-wall carbon nanotubes samples by Ar and Kr adsorption isotherms

Characterization of two single-wall carbon nanotubes samples by Ar and Kr adsorption isotherms

Thermodynamic measurements of the first layer of Ne adsorbed on closed-end single-walled carbon nanotube bundles

Thermodynamic properties and correlation functions of Ar films on the surface of a bundle of nanotubes

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