Raman resonance tuning of quaterthiophene in filled carbon nanotubes at high pressures

Alencar, Rafael S.; Aguiar, A. L.; Ferreira, Ramon Sousa Barros; Chambard, Romain; Jousselme, Bruno; Bantignies, J.-L.; Weigel, Coralie; Clément, Sébastien; Aznar, R.; Machon, Denis; Filho, A. G. Souza; San-Miguel, Alfonso; Alvarez, Laurent

doi:10.1016/j.carbon.2020.10.083

Cited by 12 publications

(8 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). This is a remarkable result as in many previous works the collapse pressure was identified as related to a change of sign in the G-band pressure derivative of the wavelength [10,32]. We do also observe this effect, but at a pressure 25 % higher than the collapse one.…”

Section: Discussionsupporting

confidence: 86%

“…This is a remarkable filling rate which was not able to be achieved for nanotube samples made of random diameters. The filling efficiency is of the same range as that of C 60 molecules when filling SWCNT material containing a majority of (10,10) tubes. This supports the statement that the main limitation to high filling rate of SWCNT with molecules is the presence of a fraction of CNT whose diameters are not energetically optimized for hosting the molecules involved -essentially, the CNT inner cavity needs to be of similar diameter than the wanted molecules to favor their adsorption.…”

Section: Experimental and Computational Methodsmentioning

confidence: 79%

“…Carbon nanotube molecular filling offers a route to simultaneously modify the physico-chemical properties of SWCNT [9,10] and increase their mechanical stability while protecting the encapsulated 1-D molecular structure [11,12]. Endohedral intercalation thus offers a route for physicochemical modifications, while avoiding bonding to other chemical species or creating defects, which both are mechanisms that introduce mechanical unstability [13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Bousige

Stolz

Silva-Santos

et al. 2021

Carbon

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Experimental and Computational Methodsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Bousige

Stolz

Silva-Santos

et al. 2021

Carbon

View full text Add to dashboard Cite

show abstract

“…Raman spectroscopy has been successfully applied to the study of carbon-nanotube-based hybrid materials, such as carbon chains encapsulated by single, double, or multiwalled carbon nanotubes − as well as organic and inorganic molecules encapsulated inside single-wall carbon nanotubes − and a plethora of chemically modified carbon nanotubes using different functional groups. − …”

Section: Introductionmentioning

confidence: 99%

Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this work, we explain the origin and the mechanism responsible for the strong enhancement of the Raman signal of sulfur chains encapsulated by single-wall carbon nanotubes by running resonance Raman measurements in a wide range of excitation energies for two nanotube samples with different diameter distributions. The Raman signal associated with the vibrational modes of the sulfur chain is observed when it is confined by small-diameter metallic nanotubes. Moreover, a strong enhancement of the Raman signal is observed for excitation energies corresponding to the formation of excited nanotube-chain-hybrid electronic states. Our hypothesis was further tested by high pressure Raman measurements and confirmed by density functional theory calculations of the electronic density of states of hybrid systems formed by sulfur chains encapsulated by different types of single-wall carbon nanotubes.

show abstract

“…The interior of CNTs has been widely used to confine molecules to form new hybrid nanostructures with interesting mechanical, electronic, and vibrational properties. − In particular, the hollow core of CNTs has been an effective environment to synthesize and stabilize linear carbon chains, the thinnest ultimate limit of a one-dimensional solid material. Carbyne (hereafter referred to as C n ) is theoretically proposed to exist in two possible structures: the polyyne, with an alternate single–triple bond chain (...–CC–CC–...) and the cumulene, a chain with double bonds (...CCCC...). , These systems present electronic, mechanical, and vibrational properties extremely dependent on the chain length. − Theoretical calculations predict that C n has extreme tensile stiffness, high shear and Young’s modulus, and a strain-dependent insulating-to-metallic transition. ,, …”

Section: Introductionmentioning

confidence: 99%

Flat-to-Flat Polymerization of Single-Walled Carbon Nanotubes under High Pressure Mediated by Carbon Chain Encapsulation

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this work, we studied single-walled carbon nanotube bundles filled with linear carbon chains under high-pressure conditions. We used density functional theory (DFT) to explore new polymerized high-pressure phases of carbon nanotubes due to cross-linking between carbon chains and the internal surface of nanotubes. Carbon nanotubes are known to transform their circular cross section into elliptical and finally peanut-shaped, which characterizes the collapse of the structure. High-pressure cycles (compression–decompression) up to a maximum of 40–50 GPa reveal the production of new polymerized carbon nanotube phases characterized by sp3 bonds in flat regions of collapsed phases. Such new carbon bonds differ from those of conventional edge-to-edge polymerization obtained for highly curved regions of collapsed tubes. We also investigated the details of the geometry, electronic structure, and thermal stability of such new polymerized hybrid structures. We observed that carbon nanotube properties are deeply changed after high-pressure cycles. Furthermore, molecular dynamics calculations at higher temperatures suggest that such type of flat-to-flat polymerization of carbon nanotubes could be more stable than conventional edge-to-edge polymerization.

show abstract

Raman resonance tuning of quaterthiophene in filled carbon nanotubes at high pressures

Cited by 12 publications

References 66 publications

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

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

Origin of the Giant Enhanced Raman Scattering by Sulfur Chains Encapsulated inside Single-Wall Carbon Nanotubes

Flat-to-Flat Polymerization of Single-Walled Carbon Nanotubes under High Pressure Mediated by Carbon Chain Encapsulation

Contact Info

Product

Resources

About