Poly(vinyl alcohol)/Multiwalled Carbon Nanotubes Composite Nanofiber

Wong-On, J.; Thumsorn, Supaphorn; Srisawat, Natee

doi:10.1016/j.egypro.2016.05.040

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Some of the nanofibers were wetted with a droplet of isopropyl alcohol, deposited onto a copper grid for transmission electron microscopy, and left to dry for 15 min. The TEM (JEOL, Peabody, MA, USA) was operated in bright-field mode at 80 kV to increase the contrast between CNx and the surrounding polymeric matrix [8,15]. Micrographs were analyzed in GMS 3 software package (Gatan Microscopy, Pleasanton, CA, USA) using the methodology proposed by Hernández-Varela [16].…”

Section: Electron Microscopymentioning

confidence: 99%

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Electrospun Mats Based on PVA/NaDDBS/CNx Nanocomposite for Electrochemical Sensing

et al. 2021

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This study presents a nanocomposite developed with PVA, multiwall carbon nanotubes (CNTs) doped with nitrogen, and NaDDBS, which change the electrical properties of the polymer and its viscosity to be used in electrospinning process for obtaining mats of nano/macro fibers. The proposed nanocomposite was characterized using Fourier transform-infrared and Raman spectroscopy techniques, confirming the presence of the CNxs immersed in the polymer. High-resolution transmission electron microscopy was used to obtain the micrographs that showed the characteristic interplanar distances of the multiwall CNT in the polymeric matrix, with values of 3.63 Å. Finally, the CNx mats were exposed to various aqueous solutions in a potentiostat to demonstrate the effectiveness of the nanofibers for electrochemical analysis. The CNx-induced changes in the electrical properties of the polymer were identified using cyclic voltammograms, while the electrochemical analysis revealed supercapacitor behavior.

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Section: Electron Microscopymentioning

confidence: 99%

“…CNTs have a high surface tension due to Van der Waal's interactions between them [15], provoking some aggregation problems due to the strength of these forces. However, some studies have shown that good CNx dispersion can be achieved by using a surfactant [3].…”

Section: Effect Of Surfactant On the Dispersion Of Pva/cnx/nadbbs Compositementioning

confidence: 99%

Electrospun Mats Based on PVA/NaDDBS/CNx Nanocomposite for Electrochemical Sensing

et al. 2021

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“…However, due to their large aspect ratio, MWCNTs are prone to agglomerate in the polymeric solution, so a complex dispersion process is required in preparation of PVA/MWCNTs nanofibers with a smooth surface. Depending upon the relevant strengths of the viscoelastic and electrostatic forces in the composite solution, the diameter and smoothness of the resulting nanofibers increases or decreases with the MWCNTs’ content in the solution. − A focused investigation into the process of synthesis of PVA/MWCNTs composite nanofibers is reported in the literature. − …”

Section: Introductionmentioning

confidence: 99%

Role of Electrical Conductivity in the Shielding Effectiveness of Composite Polyvinyl Alcohol/Multiwall Carbon Nanotube Nanofibers for Electromagnetic Interference Applications

Ghafoor,

Ahmad,

Raffi

et al. 2024

ACS Omega

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The shielding effectiveness (SE) against the electromagnetic interference (EMI) of polyvinyl alcohol/multiwall carbon nanotubes (PVA/ MWCNTs) composite nanofibers is characteristic of higher absorptivity of the radiation that enhances with the increasing concentration of MWCNTs content in these composites. However, by enriching the content of conductive fillers (MWCNTs), the conductivity of the composites is also stirred up. Concomitantly, the conductivity of these composites contributes toward the reflectivity of the EM radiation from them. Certain applications of the EMI shielding material require a lower level of reflectivity of the EM radiation. This study intends to see how SE of the PVA/MWCNTs composite nanofibers is affected vis-a-vis their conductivity for S-band radiation. Samples of nanofibers, with (5, 10, 15, and 20) wt % of MWCNTs loading in 10 wt % of PVA solution, were prepared through electrospinning and studied for their electrical conductivity and EMI SE. It is observed that by increasing the content of MWCNTs in PVA solution from 5 to 20 wt % the conductivity of the composites tends to increase from 21 to 866 times that of PVA, while the SE increases from 10 db to 25 db over the S-band range of frequencies.

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