Progressive melting in confined one-dimensional C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>60</mml:mn></mml:msub></mml:math>chains

Bousige, Colin; Rols, S.; Paineau, Erwan; Rouzière, Stéphan; Mocuta, Cristian; Verberck, Bart; Wright, Jonathan P.; Kataura, Hiromichi; Launois, Pascale

doi:10.1103/physrevb.86.045446

Cited by 8 publications

(16 citation statements)

References 21 publications

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“…The slope of the linear fit of these data allows extracting the quantity Nd 2 k B /2π 2 mv 2 , from which we can evaluate N 2700. This rather long chain size is perfectly compatible with the high filling ratio (97%) deduced from our x-ray scattering characterizations 21 and with the average size of the nanotubes estimated by TEM, i.e., between 1 and 5 μm. 23 Knowing v and N and injecting them into Eq.…”

Section: B "Low" Temperaturessupporting

confidence: 88%

“…7(b)]. In a previous study, 21 we also observed an important change in the linear thermal-expansion coefficient at this temperature. The transformation of the chain's physical nature is clearly revealed by the dynamics, the 1D order becoming unstable under the fluctuations of the lattice parameter.…”

Section: B "Low" Temperaturessupporting

confidence: 68%

“…The latter transition indeed occurs at 255 K in solid (fcc) C 60 , [16][17][18] while it was observed around 100 K in peapods. 19,20 The low dimensionality of peapods was also recently reported by us to be at the origin of the progressive translational melting of the confined 1D C 60 chains at high temperature, 21 a behavior almost perfectly described by the Takahasi-Gűrsey model introduced by Girifalco and Hodak. 7 In particular, we have shown that the high filling ratio of our samples (97% peapods internal volume occupied by C 60 chains) prevents some predicted clusterization of the chains to occur when increasing the temperature.…”

Section: Introductionsupporting

confidence: 56%

“…27 The mean distance d between the C 60 molecules is given by the position Q 1 of the inflexion point of the sawtooth peak just after 0.6Å −1 (Q 1 = 2π/d). 21 The polymerization results in a clear shift of the C 60 correlation peak towards higher Q values:…”

Section: B Inelastic Neutron Scatteringmentioning

confidence: 99%

“…The structural analysis of the peapods give the following characteristics: 21,28 nanotubes diameter Gaussian distribution centered at 14.2Å with 2Å full width at half maximum (FWHM); bundle mean size: ∼85 tubes; inter-C 60 distance: 9.9Å for monomer and 9.2Å for polymer; nanotubes filling ratio by C 60 molecules (monomer): 97%. The length of the nanotubes varies between 1 and 5 μm.…”

Section: A Sample Preparationmentioning

confidence: 99%

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From a one-dimensional crystal to a one-dimensional liquid: A comprehensive dynamical study of C60peapods

et al. 2013

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We report an inelastic neutron-scattering investigation of the longitudinal acoustic modes of C 60 chains confined inside single walled carbon nanotubes. We take advantage of the orientations of the chains within the plane of the pellet sample to isolate their scattering signatures in the (Q,ω) space, which we follow as a function of temperature from 260 K up to 1100 K. The results show the progressive evolution of the confined chain from a one-dimensional (1D) crystal to a linear liquid, the transition occurring within a temperature range of ∼150 K centered around 600 K. The comparison of the data obtained on monomer and polymer peapods allows extracting the speed of sound in the monomer crystalline chains (v mono = 3.5 km s −1 , v poly /v mono = 1.7). We find that the sound velocity is further reduced by half in the liquid state which reveals that the melting is not only due to harmonic additive thermal fluctuations, but that anharmonic terms in the intermolecular potential play an important role at high temperatures.

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Section: B "Low" Temperaturessupporting

confidence: 88%

Section: B "Low" Temperaturessupporting

confidence: 68%

Section: Introductionsupporting

confidence: 56%

Section: B Inelastic Neutron Scatteringmentioning

confidence: 99%

Section: A Sample Preparationmentioning

confidence: 99%

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From a one-dimensional crystal to a one-dimensional liquid: A comprehensive dynamical study of C60peapods

et al. 2013

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Superior carbon nanotube stability by molecular filling:a single-chirality study at extreme pressures

Bousige

Stolz

Silva-Santos

et al. 2021

Carbon

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Carbon nanotubes have extraordinary mechanical properties, but modifications of their structure tend to weaken them. Here, we have studied by experiments and modelling the one-dimensional filling of single chirality (6,5) carbon nanotubes with iodine and water. We show that iodine-filling can enhance the pressure of radial collapse of these nanotubes by a factor 2 compared to the empty (6,5) tubes. For water filling, this enhancement factor reduces to 1.4. Our single-chirality study allows correlating the different Raman signatures of the radial collapsing process, which was not possible in samples with mixed chiralities. A clear spectroscopic signature of the collapse pressure can thus be given: it is the pressure at which the G-band frequency evolution with pressure softens while the radial breathing mode intensity vanishes. These new criteria for the detection of radial collapse allow correcting some existing discrepancies in the literature. Finally, we discuss the impact of molecular filling on the radial mechanical stability as a function of the tube diameter. It results that molecular filling allows for a superior stability effect than filling with tubes (i.e. multi-wall carbon nanotubes). The stability enhancement tends to grow with the tube diameter and depends strongly on the nature of the filling molecules.

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