Electromechanical properties of fibers produced from randomly oriented SWCNT films by wet pulling technique

Shandakov, Sergey D.; Kosobutsky, А. V.; Vershinina, A. I.; Sevostyanov, О. G.; Chirkova, I. М.; Russakov, D. М.; Lomakin, M. V.; Рыбаков, М. С.; Глушкова, Т. В.; Овчаренко, Е. А.; Zhilyaeva, Maria A.; Nasibulin, Albert G.

doi:10.1016/j.mseb.2021.115178

Cited by 10 publications

(6 citation statements)

References 47 publications

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“…One can note that the use of EtOH only slightly changes the film resistance, whereas the densification with IPA significantly improves the film conductivity. The obtained result is consistent with refs and , where it has been shown that the bundles densified using ethanol demonstrate relatively low packing degree (i.e., high distance between CNTs in a bundle) and, as a result, low conductivity. This can be explained by more effective bundle densification in IPA, which reduces the intertube distance, and thus, enhances the conductivity in bundles forming SWCNTs films.…”

Section: Methodssupporting

confidence: 92%

Tuning the Optical Properties and Conductivity of Bundles in Networks of Single-Walled Carbon Nanotubes

Mitin

Vorobyev

Павлов

et al. 2022

J. Phys. Chem. Lett.

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The films of single-walled carbon nanotubes (SWCNTs) are a promising material for flexible transparent electrodes, which performance depends not only on the properties of individual nanotubes but also, foremost, on bundling of individual nanotubes. This work investigates the impact of densification on optical and electronic properties of SWCNT bundles and fabricated films. Our ab initio analysis shows that the optimally densified bundles, consisting of a mixture of quasi-metallic and semiconducting SWCNTs, demonstrate quasi-metallic behavior and can be considered as an effective conducting medium. Our density functional theory calculations indicate the band curving and bandgap narrowing with the reduction of the distance between nanotubes inside bundles. Simulation results are consistent with the observed conductivity improvement and shift of the absorption peaks in SWCNT films densified in isopropyl alcohol. Therefore, not only individual nanotubes but also the bundles should be considered as building blocks for high-performance transparent conductive SWCNT-based films.

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Section: Methodssupporting

confidence: 92%

Tuning the Optical Properties and Conductivity of Bundles in Networks of Single-Walled Carbon Nanotubes

Mitin

Vorobyev

Павлов

et al. 2022

J. Phys. Chem. Lett.

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“…Previously, it was shown that solvent selection and chemical doping may lead to similar increase in properties (150 S cm −1 for ethanol versus 400 S cm −1 for acetone; 400 S cm −1 for both, ethanol with HAuCl 4 doping and acetone with HAuCl 4 doping). [ 66 ] Thus, we may expect that a combination of the techniques with the one reported here may lead to even further increases in fiber performance. Comparing with other techniques, wet pulling also can be upscaled for industrial applications (Figure 7b).…”

Section: Resultsmentioning

confidence: 94%

Approaching Technological Limit for Wet‐Pulling Technique

Chetyrkina,

Butt,

Bulavskiy

et al. 2024

Adv Eng Mater

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Carbon nanotube fibers (CNTFs) are a promising economical replacement material for contemporary metallic wired conductors due to their light weight and advanced electro‐mechanical properties. The wet‐pulling technique for CNTF manufacturing is highly versatile, adaptable for both laboratory as well as industrial scale production and can be optimized for the maximum enhancement of electro‐physical properties. Here, we examine a mechano‐solvent based post‐fabrication approach for maximizing densification and improving electrical properties of wet‐pulled CNTFs. The experimental process resulted in fibers achieving 60% of the theoretically maximum density and conductivity of maximally densified metallic single‐walled carbon nanotube bundles. The technique allows a corresponded increase of ∽700% for a fiber density (from 100 to 704 kg m‐3), a simultaneous ∽530% increase in the electrical conductivity (from 748 to 3990 S cm‐1) and reduced volume defects from 18% to 2%. The approach was combined with a step‐wise microstructure monitoring using FIB‐SEM to determine the mechanisms behind the optimized structures. This work is the first to provide an experimental and theoretical base for the post‐fabrication optimization of wet‐pulled CNTFs and lays the foundation for further enhancement with techniques such as chemical doping, fiber compounding and combined infiltration/densification mechanisms.This article is protected by copyright. All rights reserved.

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“…CNTFs were produced from these thin lms using the wet-pulling technique, which involves the dry transfer of CNT thin lms to a substrate, their wetting with a volatile liquid, and subsequent mechanical pulling, which converts the thin lms into bers. The fabrication procedure has been detailed in previous works [31][32][33]. In this work, ethanol was used as the liquid for the wetting of the SWCNT lm and its subsequent densi cation under evaporation.…”

Section: Methodsmentioning

confidence: 99%

“…Their dimensions were measured using an optical microscope and their electrical properties were characterized with a Keithley 2000 multimeter (Beaverton, OR, USA). Their nominal conductivity, that is inversely proportional to resistivity, was calculated using the standard formula R = ρ , where R is the measured resistance, ρ is resistivity, l is the length between electrodes and a is the nominal cross sectional area [32].…”

Section: Methodsmentioning

confidence: 99%

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Multifunctional nanocomposite assessment using carbon nanotube fiber sensors

Butt,

Krasnikov,

Kondrashov

et al. 2024

Preprint

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Here, we propose a novel application of carbon nanotube fibers (CNTFs) for the one-step, dual-stage, non-destructive monitoring of multifunctional conductive nanocomposites. Hierarchical nanocomposites were created by embedding CNTFs into carbon nanotube (CNT) - modified matrices during their manufacturing to assess production variables. CNTFs are then left embedded in the structure for monitoring during nanocomposite application. We investigated the dependence of detection sensitivity and reliability on the CNTF diameter (~ 40–700 µm), electrical conductivity (~ 102-104 S/m), and the choice of measurement technique (2- and 4-point) for single-walled and multiwalled CNT fillers at different concentrations. The sensors showed promising sensitivity to CNT type and concentration, the results were independent of CNTF diameter and contact resistance, and showed low noise. For application monitoring, nanocomposites electrical and mechanical (tensile and cyclic) properties were tested to determine sensitivity to static and dynamic conditions. CNTFs did not cause any reduction in mechanical properties, unlike the losses observed for metallic electrodes (up to 60% reduction in ultimate tensile strength). CNTF-based evaluation of the electrical resistivity (between 102 — 106 Ohm∙cm) and dynamic electrical response (gauge factor between ~ 2 — 12) matched values from a standard electrode material. Microstructural analysis proved that this unique performance was due to the surface and internal volume infiltration of the nanocomposite matrices into the CNTFs, causing interconnection of the CNTs of the matrix and CNTFs. These findings show that CNTFs may be used to accurately monitor nanocomposite multifunctional properties both during manufacturing and application using one-step integration, regardless of the sample size and manufacturing technology.

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Electromechanical properties of fibers produced from randomly oriented SWCNT films by wet pulling technique

Cited by 10 publications

References 47 publications

Tuning the Optical Properties and Conductivity of Bundles in Networks of Single-Walled Carbon Nanotubes

Tuning the Optical Properties and Conductivity of Bundles in Networks of Single-Walled Carbon Nanotubes

Approaching Technological Limit for Wet‐Pulling Technique

Multifunctional nanocomposite assessment using carbon nanotube fiber sensors

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