Effects of surfactant and fabrication procedure on the electrical conductivity and electromagnetic shielding of single-walled carbon nanotube films

Komarov, F. F.; Żukowski, P.; Kryvasheyeu, R. M.; Muñoz, Edgar; Kołtunowicz, Tomasz N.; Rodionova, V. N.; Togambaeva, A. K.

doi:10.1002/pssa.201431493

Cited by 27 publications

(9 citation statements)

References 37 publications

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“…Measurements of electrical parameters (capacitance C p , conductivity σ, the phase difference θ) have been performed in an equivalent parallel system using alternating current of the frequency range 50 Hz -5×10 6 Hz. The measuring temperature effect on electrical parameters of the nano films has been tested for the temperature range from 15 K to 375 K. The experimental setup that has been applied to measure AC electrical properties of nanocomposites is presented in [45,46]. The measurements have been realized for samples sized: 10 mm in length, 3 mm in width and 1 µm in thickness.…”

Section: Methodsmentioning

confidence: 99%

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Boiko

Kołtunowicz

Żukowski

et al. 2017

Ceramics International

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Two samples of the ferromagnetic alloyferroelectric ceramics nanocomposite (FeCoZr) x (PbZrTiO 3 ) (100−x) of similar metallic phase contents have been produced using ion-beam sputtering in the atmosphere of argon and oxygen. The samples have been produced in order to examine the influence of sputtering atmosphere parameters on electrical properties of the tested materials.In a nanocomposite of a reduced oxygen content, a conductivity increase by about three orders occurs along with the increasing frequency, which is associated with the occurrence of hopping recharging. Over the whole area of low measuring frequencies, negative values of the phase shift and a capacitive type of conductivity occur. For the frequency of about 10 6 Hz, the phase shift reaches zero, which corresponds to the voltage resonance phenomenon. For higher frequencies, positive phase shift values and inductive conductivity occur. For a sample of a higher oxygen content, phenomena of voltage resonance (low frequency values) and current resonance (high frequency values) can be observed. When the oxygen content increases, frequency dependences of the phase difference get shifted into the low frequency area. This is associated with the surface oxidation or a complete oxidation of the metallic-phase nanograins, which increases the potential barrier as well as with an increase of the relaxation time activation energy. For the sample of a higher oxygen content, an increase of the conductivity activation energy has been observed in the low temperature area.

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Section: Methodsmentioning

confidence: 99%

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

Boiko

Kołtunowicz

Żukowski

et al. 2017

Ceramics International

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“…It can be observed from Figure 9 (and Table S10 of supporting material) that the properties of buckypaper after post-treatment are superior to those before post-treatment. The behavior was such because the moisture contents and amount of surfactant added in the dispersion could have evaporated/decomposed from buckypaper after post-treatment, resulting in improved properties of the buckypaper-based sensors [37,60].…”

Section: Sensor Propertiesmentioning

confidence: 99%

A New Route to Enhance the Packing Density of Buckypaper for Superior Piezoresistive Sensor Characteristics

Danish

Luo

2020

Sensors

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Transforming individual carbon nanotubes (CNTs) into bulk form is necessary for the utilization of the extraordinary properties of CNTs in sensor applications. Individual CNTs are randomly arranged when transformed into the bulk structure in the form of buckypaper. The random arrangement has many pores among individual CNTs, which can be treated as gaps or defects contributing to the degradation of CNT properties in the bulk form. A novel technique of filling these gaps is successfully developed in this study and termed as a gap-filling technique (GFT). The GFT is implemented on SWCNT-based buckypaper in which the pores are filled through small-size MWCNTs, resulting in a ~45.9% improvement in packing density. The GFT is validated through the analysis of packing density along with characterization and surface morphological study of buckypaper using Raman spectrum, particle size analysis, scanning electron microscopy, atomic force microscopy and optical microscopy. The sensor characteristics parameters of buckypaper are investigated using a dynamic mechanical analyzer attached with a digital multimeter. The percentage improvement in the electrical conductivity, tensile gauge factor, tensile strength and failure strain of a GFT-implemented buckypaper sensor are calculated as 4.11 ± 0.61, 44.81 ± 1.72, 49.82 ± 8.21 and 113.36 ± 28.74, respectively.

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“…Temperature ac measurements of electrical parameters in the range 81273 K were performed with the use of device described in [28]. The current's frequency was changed in the range 50 Hz1 MHz.…”

Section: Resultsmentioning

confidence: 99%

Percolation Phenomena in Cu_x(SiO_y)_100-xNanocomposite Films Produced by Ion Beam-Sputtering

et al. 2015

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In this paper the results of examinations of nanocomposites Cux(SiOy)100−x produced by ion beam sputtering using argon ions were presented. The examinations were performed by the use of ac devices for measuring frequency in the range 50 Hz1 MHz and temperatures from 81 K to 273 K. The measurements were performed for the samples directly after production. Based on temperature dependences of conductivity σ, which were determined at the frequency 100 Hz, the Arrhenius graphs were prepared. From these graphs conductivity activation energies ∆E were calculated. Dependences of conductivity and activation energy of electrons on the metallic phase content x at the frequency 100 Hz were determined. Analysis of the obtained dependences shows that conductivity is a parabolic function of the metallic phase content x in nanocomposites. Changes of activation energies of nanocomposites, in which metallic phase contents are in the ranges x < 12 at.% and x > 68 at.%, demonstrate negative values metallic type of conductivity. In the range 12 at.% < x < 68 at.% activation energies have positive values the dielectric type of conductivity. It was established that for the metallic phase content of about 68 at.% the real percolation threshold occurs, and the conduction changes from dielectric to metallic type.

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Effects of surfactant and fabrication procedure on the electrical conductivity and electromagnetic shielding of single-walled carbon nanotube films

Cited by 27 publications

References 37 publications

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

A New Route to Enhance the Packing Density of Buckypaper for Superior Piezoresistive Sensor Characteristics

Percolation Phenomena in Cu_x(SiO_y)_100-xNanocomposite Films Produced by Ion Beam-Sputtering

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Effects of surfactant and fabrication procedure on the electrical conductivity and electromagnetic shielding of single-walled carbon nanotube films

Cited by 27 publications

References 37 publications

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

The effect of sputtering atmosphere parameters on dielectric properties of the ferromagnetic alloy – ferroelectric ceramics nanocomposite (FeCoZr)x(PbZrTiO3)(100−x)

A New Route to Enhance the Packing Density of Buckypaper for Superior Piezoresistive Sensor Characteristics

Percolation Phenomena in Cux(SiOy)100-xNanocomposite Films Produced by Ion Beam-Sputtering

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Product

Resources

About

Percolation Phenomena in Cu_x(SiO_y)_100-xNanocomposite Films Produced by Ion Beam-Sputtering