The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

The experimental studies of the heat capacity of 1D chains of xenon atoms adsorbed in the outer grooves of bundles of closed single-walled carbon nanotubes C Xe have been first made at temperature range 2-30 K with the adiabatic calorimeter. The experimental data C Xe have been compared with theory [A. Šiber, Phys. Rev. B 66, 235414 (2002)]. The experimental and theoretical heat capacity curves are close below 8 K. Above 8 K the experimental curve C Xe (T) exceeds the theoretical one and excess capacity C Xe (T) increases monotonously with temperature. We assume that the C Xe (T) caused mainly by the increase of the distance between the neighboring xenon atoms in the chain with increasing temperature.

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“…The results of different runs coincided within the measurement error. Other experimental features have been reported elsewhere [32,35].…”

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confidence: 88%

Experimental low-temperature heat capacity of one-dimensional xenon adsorbate chains in the grooves of carbon c-SWNT bundles

Bagatskii

Manzheliı̆

Sumarokov

et al. 2013

Low Temperature Physics

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“…In these bundles, gas atoms are adsorbed mainly in the grooves between the nanotubes on the surface of bundles [9,10]. Neutron diffraction data [9] and the behavior of the specific heat of these systems at low concentration of adsorbed gases [11][12][13][14] indicate the formation of quasi-one-dimensional structures by gas atoms.…”

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confidence: 99%

Phonon spectrum and vibrational characteristics of linear nanostructures in solid matrices

Manzhelii

Feodosyev

Gospodarev

et al. 2015

Low Temperature Physics

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Introduction:The relative simplicity of one-dimensional models often helps to solve the problem in an analytical form from the beginning to the end. For many years, one-dimensional models have retained attractive for a qualitative description of quasi-particle spectra and consequently physical characteristics of solids (see, e.g., [1]. Nondegeneracy of the energy eigenvalues and the absence of singularities on the spectral densities within the continuous spectrum band significantly simplify the problem of determining spectra perturbations induced by various defects [1,2]. At once it should be noted that the formation of localized states in lowdimensional and three-dimensional systems are quite different (see, e. g., [3]). On the one hand, the use of one-dimensional models for the description of vibrations localized on defects in threedimensional crystals reduces the value of this description. On the other hand, the zero-threshold forming of local discrete levels outside the quasi-continuous spectrum band and the strong dependence of energy levels on the defect parameters are of great general importance including applied purposes.The in-stability of the crystalline phase of one-dimensional structures is the main disadvantage for the description of phonon spectra and vibrational characteristics of real systems.There is no long-range order in one-dimensional systems because even at its mean-square displacements diverge [4]. However, if the phonon spectrum of a linear chain starts with a frequency different from zero, this divergence disappears and thus the linear chains can exist in reality and can be studied experimentally. They can exist as the linear chains of atoms in the bulk or on the surface of some solid matrices, i.e., quasi-chains of carbon atoms between graphene monolayers on silicon substrates [5] and chains of gold atoms deposited on the silicon surface [6-8]. The bundles of closed at the ends nanotubes enriched with gases containing quasi-one-0 T =

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“…Other experimental features have been reported elsewhere [44,[46][47][48]. Figure 15.3 demonstrates low-temperature dependencies of the total heat capacity C ad+Xe and its addenda component C ad .…”

Section: Methodsmentioning

confidence: 84%

“…One or several layers of atoms/molecules adsorbed at the OS of the c-SWNT bundle form quasi-2D or quasi-3D systems. The 1D, 2D, and 3D systems have different properties at low temperatures [12][13][14][15][16][17][18][19]. Physical properties (adsorption, thermal, and structural) of simple gas admixtures deposited in c-SWNT bundles were investigated in experimental and theoretical works [5, 6, 9-11, 15, 20-39].…”

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confidence: 99%

Heat Capacity of 1D Chains of Atom/Molecule Adsorbates in the Grooves of c-SWNT Bundles

Sumarokov

Bagatskii

Barabashko

2014

Springer Proceedings in Physics

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Since the discovery of carbon nanotubes in 1991 [1], investigations of the physical properties of these novel materials have been rated as a fundamentally important trend in physics of condensed matter [2,3]. Of special interest is the study of properties of low-dimensional systems [4][5][6][7][8][9]. The unique structure of bundles of single-walled carbon nanotubes (SWNTs) permits obtaining quasi-one-dimensional (1D), 2D, and 3D structures formed by adsorbates [5,10]. Technologically, most of the nanotubes in the prepared bundles have closed ends unless special steps are taken to open them. Figure 15.1 demonstrates the possible sites of adsorption of a relatively small admixture atoms or molecules in a bundle of closed SWNTs (c-SWNTs): interstitial channels (IC), grooves (G) at the outer surface, and the outer surface (OS). These positions differ in geometrical size and energy of adsorbate binding to c-SWNT bundles [11]. At low adsorbate concentrations, quasi-1D chains of admixture atoms/molecules are formed in the IC-and G-sites. One or several layers of atoms/molecules adsorbed at the OS of the c-SWNT bundle form quasi-2D or quasi-3D systems. The 1D, 2D, and 3D systems have different properties at low temperatures [12][13][14][15][16][17][18][19]. Physical properties (adsorption, thermal, and structural) of simple gas admixtures deposited in c-SWNT bundles were investigated in experimental and theoretical works [5, 6, 9-11, 15, 20-39].The heat capacity of 4 He adsorbed on c-SWNT bundles was investigated at temperatures below 6 K [6,33]. It was observed [6] that the heat capacity of the adsorbed helium exhibited the behavior of 1D and 2D structures depending on the technique of sample preparation (laser evaporation or arc discharge). Structures of 4 He adsorbates in the grooves and at the OS of c-SWNT bundles were studied by the neutron diffraction method [18]. At low coverage, the 4 He atoms formed a 1D single line lattice along the grooves. As the concentration of the adsorbed helium atoms increased,

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The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

Cited by 34 publications

References 46 publications

Experimental low-temperature heat capacity of one-dimensional xenon adsorbate chains in the grooves of carbon c-SWNT bundles

Experimental low-temperature heat capacity of one-dimensional xenon adsorbate chains in the grooves of carbon c-SWNT bundles

Phonon spectrum and vibrational characteristics of linear nanostructures in solid matrices

Heat Capacity of 1D Chains of Atom/Molecule Adsorbates in the Grooves of c-SWNT Bundles

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