6.8 Carbon Nanotube-Based Composites

Fiedler, Bodo; Schulte, Karl

doi:10.1016/b978-0-12-803581-8.10012-8

Cited by 3 publications

(2 citation statements)

References 120 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is noteworthy that the CNTs have a hexagonal structure, consisting of carbon atoms that form rolled-up graphite sheets into a cylinder shape [7]. Two types of nanotubes can be distinguished based on the arrangement of the graphite sheets: single-walled nanotubes (SWCNTs), which is a single layer of cylindrical graphene, and multiwall nanotubes (MWCNTs), which have many concentric layers [8,9]. It should be also noted that CNTs are a suitable material for gas sensing layer realization due to their hollow shape and porous structure, as well as their size, large surface area and surface to volume ratio, and the existence of defects [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes/Graphene Nanocomposite as Gas Sensor

Omran

Abdullah

Al-Zuhairi

2022

eijs

View full text Add to dashboard Cite

In this work, polyvinylpyrrolidone (PVP), multi-walled carbon nanotubes (MWCNTs) nanocomposite was prepared and hybridized with Graphene (Gr) by the solution casting method. The morphological and electrical properties were investigated by field effect scanning electron microscopy (FESEM) images, portraying a uniform dispersion of graphene within the PVP-MWCNT nanocomposite. The AC conductivity increased from (1.45552) to (2.34812) (Ω cm)-1 with the use of nanocomposite. The increasing continues for the AC conductivity after hybridized with graphene up to (7.20641) (Ω cm)-1. In addition, the performances of the prepared samples for gas sensor application have been investigated. It was seen that the sensitivity analysis portrayed higher value for the nanocomposite hybridized with Gr (S=2.2 and 5.4%) as compared to the pure sample (MWCNTs). Finally, the recovery and response times were increased when the temperature increased due to the increment of the adsorption of the gas that resulted from the free electrons.

show abstract

Section: Introductionmentioning

confidence: 99%

Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes/Graphene Nanocomposite as Gas Sensor

Omran

Abdullah

Al-Zuhairi

2022

eijs

View full text Add to dashboard Cite

show abstract

“…In addition, CNTs have a large aspect ratio and are chemically stable in a polymer matrix. Consequently, CNTs have been mixed with polymers to fabricate electrically conductive composites [6]- [8]. The cylinder-shaped individual CNTs contact with each other, and form a conductive network in polymers.…”

Section: Introductionmentioning

confidence: 99%

Strain Self-Sensing Tailoring in Functionalised Carbon Nanotubes/Epoxy Nanocomposites in Response to Electrical Resistance Change Measurement

Nourry

Gharavian

et al. 2020

SSRN Journal

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) are inherently multifunctional, conductive and possess piezo-resistive characteristics. Aiming at the multi-functionality of materials, nanocomposites made of epoxy resin with embedded CNTs are a promising solution for strain self-sensing applications. A critical parameter to achieve repeatable and reliable measure is the CNTs dispersion state in the resin. This study investigated the effect of CNTs concentration (0.01 wt% and 0.1 wt%), with different loading of surfactant Triton X-100, (0.0%, 0.2%, 0.5% and 1.0%) on strain sensing in terms of sensitivity and linearity based on electrical resistance data. The CNTs were synthesised directly using an injection floating catalyst chemical vapor deposition (ICCVD) process and their quality was characterised by Raman spectroscopy and scanning electron microscopy. Only the epoxy modfied with 0.1 wt% CNTs exhibited sufficient piezo-resistivity for the resistance measurements, and those with 0.01 wt% CNTs did not show sufficiently measurable conductivity so were excluded in our study, since their CNTs were highly entangled, and conductive network failed to be established. It was observed that, with 0.1 wt% CNTs, adding 0.5% content of the surfactant improved gauge factor. With more content of the surfactant (1.0 %), surprisingly, we observed a drop of gauge factor by the order of two. Therefore, by comparing the conductivity change between 1.0% and 0.5% surfactant, we postulated that the relatively high content surfactant has reached critical micelle concentration, and negatively affects CNTs dispersion state. The research presented in this article shows that moderate content of surfactant could improve piezoresistivity gauge factor while excessive surfactant could cause adverse effect.

show abstract

Structural and Infrared Spectroscopy of Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes Nanocomposite

Omran

Abdullah

Al-Zuhairi

2021

IJP

View full text Add to dashboard Cite

In this work, polyvinylpyrrolidone (PVP)/ Multi-walled carbon nanotubes (MWCNTs) nanocomposites were prepared with two concentrations of MWCNTs by casting method. Morphological, structural characteristics and electrical properties were investigated. The state of MWCNTs dispersion in a PVP matrix was indicated by Field Effect-Scanning Electron Microscopy (FESEM) which showed a uniform dispersion of MWCNTs within the PVP matrix. X-ray Diffraction (XRD) indicate strong bonding of carbonyl groups of PVP composite chains with MWCNTs. Fourier transfer infrared (FTIR) studies shows characteristics of various stretching and bending vibration bands, as well as shifts in some band locations and intensity changes in others. Hall effect was studied to test the type of charge carriers which was shown to be P-type. The electrical conductivity was shown increased for the pure PVP and pure MWCNT from (2.047×10-5) (Ω.cm)-1 and (3.683×101) (Ω.cm)-1 to (2.51×102 and 2.36×102) (Ω.cm)-1for both concentrations of nanocomposites, which indicate the conductivity was enhancement by using the carbon nanotubes.

show abstract

6.8 Carbon Nanotube-Based Composites

Cited by 3 publications

References 120 publications

Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes/Graphene Nanocomposite as Gas Sensor

Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes/Graphene Nanocomposite as Gas Sensor

Strain Self-Sensing Tailoring in Functionalised Carbon Nanotubes/Epoxy Nanocomposites in Response to Electrical Resistance Change Measurement

Structural and Infrared Spectroscopy of Polyvinylpyrrolidone/Multi-walled Carbon Nanotubes Nanocomposite

Contact Info

Product

Resources

About