Construction of unique conductive networks in carbon nanotubes/polymer composites via poly(ε-caprolactone) inducing partial aggregation of carbon nanotubes for microwave shielding enhancement

Tao, Jun-Ru; Luo, Chenglong; Huang, Ming‐Lu; Weng, Yunxuan; Wang, Ming

doi:10.1016/j.compositesa.2022.107304

Cited by 61 publications

(39 citation statements)

References 58 publications

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“…15 The relative areas of the deconvoluted SWCNT peaks in the measured Raman spectra for the PVA/SWCNT CPC-B film are provided in Table 2. These results provide a rough estimate of each SWCNT chirality content in the PVA/SWCNT CPC and suggest that the (10, 2), (7,6), and (7, 3) SWCNTs are the dominant chiralities in the samples. Because the (7, 3) SWCNT has the smallest diameter (see Table 2), it will also have the largest band gap.…”

Section: Resultsmentioning

confidence: 84%

Designing Scalable Anisotropically Conductive Thin Films Using Hot Drawing of Poly(vinyl alcohol)/Single-Walled Carbon Nanotube Composites

Zamora-Ledezma,

Gallardo,

Suárez-Fernández

et al. 2023

ACS Appl. Polym. Mater.

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The production of industrially scalable conductive polymer-based composites (CPCs), with tailored physicochemical properties, such as anisotropic conductivity, has proved a formidable challenge in nanoscience and nanotechnology. This is because the final performance of such CPCs dramatically depends on the distribution and type of polymer matrix, the degree of spatial ordering, and the material’s percolation threshold. By adjusting the concentration of single-walled carbon nanotubes (SWCNTs) within a hot-drawn poly(vinyl alcohol) (PVA) composite, we show that a 10-fold increase in the CPC’s conductivity and a four-fold increase in its anisotropy may be obtained. Using a combination of Raman spectroscopy, density functional theory (DFT), and nonequilibrium Green’s function (NEGF)-based methods, we develop a general ab initio model, which describes qualitatively and semiquantitatively the measured conductivity of our PVA/SWCNT CPCs. The success of this model shows that the CPC’s conductivity is determined by (1) the connectivity of the SWCNT network within the polymer matrix, (2) the hopping resistance to intertube conductance, (3) the concentration of SWCNTs in the sample, and (4) the amount of stretching and concomitant orientational order parameter of the SWCNTs in the composite. Our combined experimental and theoretical approach provides a means for designing CPCs with given anisotropic conductivities based on SWCNTs within different polymer matrices and should prove highly relevant to a broad academic and industrial community interested in nanomaterial design.

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Section: Resultsmentioning

confidence: 84%

Designing Scalable Anisotropically Conductive Thin Films Using Hot Drawing of Poly(vinyl alcohol)/Single-Walled Carbon Nanotube Composites

Zamora-Ledezma,

Gallardo,

Suárez-Fernández

et al. 2023

ACS Appl. Polym. Mater.

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“…wileyonlinelibrary.com/journal/pi interaction between the PCL chains and the GNP or CNT particles and the low viscosity of the PCL matrix. 51,52 Figure 2 shows the dispersion and networks of CNT/GNP and CNT/CB mixed fillers in the CNT/GNP/PCL and CNT/CB/PCL composites. All the samples have the same filler loading of 4.12 vol %.…”

Section: Resultsmentioning

confidence: 99%

Constructing high‐efficiency microwave shielding networks in multi‐walled carbon nanotube/poly(ε‐caprolactone) composites by adding carbon black and graphene nano‐plates

Sun

Peng

Huang

et al. 2023

Polymer International

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Herein, high‐efficiency microwave shielding networks are constructed in multi‐walled carbon nanotube/poly(ε‐caprolactone) (CNT/PCL) composites by adding carbon black (CB) or graphene nano‐plates (GNPs). The synergistic effect of carbonaceous fillers with different rdimensions is investigated to obtain the optimal electromagnetic shielding performance of the composites. The CNT/GNP/PCL, CNT/CB/PCL and CB/GNP/PCL composites with different ratios were prepared by melt mixing and hot press molding for the microwave shielding evaluation. Because of the synergistic effect, the microwave shielding effectiveness values of 53.8 and 54.6 dB, which are achieved in the CNT9/CB1/PCL (CNT:CB = 9:1) and CNT9/GNP1/PCL (CNT:GNP = 9:1) composites, respectively, are higher than the value of 46.4 dB for the CNT/PCL composites with the same filler content of 4.12 vol%. The synergistic effect between carbonaceous fillers is attributed to the high‐efficiency shielding networks which can be easily formed by carbonaceous fillers with different dimensions. © 2023 Society of Industrial Chemistry.

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“…Conductive polymer composites (CPCs), which comprise insulating polymers and conductive fillers, are of significant interest for electromagnetic interference shielding (EMI), sensors, and energy storage. Various types of fillers are used to produce composites for EMI shielding applications. − Of these, carbonaceous fillers such as graphene and carbon nanotubes (CNTs) are known to be effective conductive fillers for the fabrication of CPCs on account of their modifiable aspect ratio, low density, flexibility, and superior electrical properties such as conductivity, dielectric permittivity, dielectric loss, and piezoresistivity. − The electrical conductivity and EMI shielding performance of nanocarbon-containing polymer composites can be enhanced using several strategies, such as controlling the dispersion and distribution of the filler particles in the phases/interface of polymer blends, , introducing cation-π interactions, , controlling the surface conductivity of sandwiched composites, achieving a segregated structure, , and improving the dispersion and distribution of filler particles in nanocomposites with high filler content and foams. , …”

Section: Introductionmentioning

confidence: 99%

“…1−7 Of these, carbonaceous fillers such as graphene and carbon nanotubes (CNTs) are known to be effective conductive fillers for the fabrication of CPCs on account of their modifiable aspect ratio, low density, flexibility, and superior electrical properties such as conductivity, dielectric permittivity, dielectric loss, and piezoresistivity. 4−7 The electrical conductivity and EMI shielding performance of nanocarbon-containing polymer composites can be enhanced using several strategies, such as controlling the dispersion and distribution of the filler particles in the phases/ interface of polymer blends, 8,9 introducing cation-π interactions, 10,11 controlling the surface conductivity of sandwiched composites, 12 achieving a segregated structure, 13,14 and improving the dispersion and distribution of filler particles in nanocomposites with high filler content 15 and foams. 16,17 Significant benefits for EMI shielding applications can be attained through the production of CPC foams.…”

Section: Introductionmentioning

confidence: 99%

Nanocarbon-Containing Polymer Composite Foams: A Review of Systems for Applications in Electromagnetic Interference Shielding, Energy Storage, and Piezoresistive Sensors

Banerjee

Gebrekrstos

Orasugh

et al. 2023

Ind. Eng. Chem. Res.

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This paper presents recent developments in electrically conducting nanocarbon-containing polymer composite foams for advanced applications and introduces the knowledge gaps and potential solutions. Various materials have been used for electromagnetic interference shielding, energy storage, and piezoresistive applications. Among these, nanocarbon-containing polymer composite foams score high because of their superior performance and lightweight. By offering a holistic overview of the fundamentals of electromagnetic interference shielding, piezoresistivity, the processing of polymer nanocomposites and foams, and the critical aspects related to the development of electrically conducting polymer nanocomposite foams for advanced applications, this paper provides insight into future advances in this area. Furthermore, the selective localization of nanofiller particles in polymer blends and the consequent effects on the foamability and electrical properties of foams, an area seldom discussed in the literature, is critically reviewed in the present work. In summary, this paper offers new insights into the design of advanced conductive nanocarbon-containing polymer composite foams for applications in electromagnetic interference shielding, energy storage, and piezoresistive sensors.

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Construction of unique conductive networks in carbon nanotubes/polymer composites via poly(ε-caprolactone) inducing partial aggregation of carbon nanotubes for microwave shielding enhancement

Cited by 61 publications

References 58 publications

Designing Scalable Anisotropically Conductive Thin Films Using Hot Drawing of Poly(vinyl alcohol)/Single-Walled Carbon Nanotube Composites

Designing Scalable Anisotropically Conductive Thin Films Using Hot Drawing of Poly(vinyl alcohol)/Single-Walled Carbon Nanotube Composites

Constructing high‐efficiency microwave shielding networks in multi‐walled carbon nanotube/poly(ε‐caprolactone) composites by adding carbon black and graphene nano‐plates

Nanocarbon-Containing Polymer Composite Foams: A Review of Systems for Applications in Electromagnetic Interference Shielding, Energy Storage, and Piezoresistive Sensors

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