2015
DOI: 10.1002/pssb.201451745
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Synergy effects in the electrical conductivity behavior of onion-like carbon and multiwalled carbon nanotubes composites

Abstract: The dielectric/electric properties of polyurethane composites filled with carbon nanotubes (CNT), onion-like carbon (OLC), and mixed OLC/CNT are compared across a wide frequency range from hertz to terahertz. The dielectric/electric properties of composites filled with OLC are very attractive and can be improved by addition of small amounts of CNTs due to a strong synergism between the two carbon allotropes. Moreover, in composites with mixed OLC/CNT inclusions, the value of the percolation threshold is lower … Show more

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Cited by 11 publications
(15 citation statements)
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“…This temperature cross-over has also been observed in polymer matrices accommodating various carbon nano-structures. The complex conductivity studies in the carbon nanotubes/carbon nano-onions/polyurethane (CNT/CNO/PU) and the CNO/PU composites [5] and multiwall carbon nanotubes (MWCNT)/poly(methyl methacrylate (PMMA) [39] indicated that the dielectric permittivity and electrical conductivity are most pronouncedly reduced below 100 K.…”
Section: Evidence For Two Hopping Conductivity Mechanismsmentioning
confidence: 99%
See 1 more Smart Citation
“…This temperature cross-over has also been observed in polymer matrices accommodating various carbon nano-structures. The complex conductivity studies in the carbon nanotubes/carbon nano-onions/polyurethane (CNT/CNO/PU) and the CNO/PU composites [5] and multiwall carbon nanotubes (MWCNT)/poly(methyl methacrylate (PMMA) [39] indicated that the dielectric permittivity and electrical conductivity are most pronouncedly reduced below 100 K.…”
Section: Evidence For Two Hopping Conductivity Mechanismsmentioning
confidence: 99%
“…Electrically percolating composites consisting of a polymer matrix filled with carbon nanostructures have been studied to obtain optimum electrical, electromagnetic, mechanical and thermal properties [3]. Recently, the effect of CNO loading on the dielectric and electric properties of composites was investigated [4,5,6]. For different composites, the concentrations of the carbon nano-particles and their percolation threshold (i.e., the critical concentration for which a continuous conduction network is available to electric charge carriers) were studied.…”
Section: Introductionmentioning
confidence: 99%
“…The MWCNTs with diameter 20 nm and length (5 Ä 10) m were purchased from Amorphous Carbon Materials Inc. The OLC nanoparticles with diameter about 100 nm were fabricated using vacuum heating from detonation nanodiamonds [9,12,[21][22][23]. The size of OLC was determined by dynamic light scattering technique [9].…”
Section: Methodsmentioning
confidence: 99%
“…It is aimed at obtaining low percolation threshold materials with the minimal density of expensive¯llers (as CNTs are). Using more than one type of carbon nanoparticles in one composite (hybrid composites) makes it possible for electrical transport to occur in di®erent llers' percolation networks together (synergy e®ect), which reduces the percolation threshold [9,10]. Therefore, hybrid composites enlarge opportunities to fabricate materials with wanted characteristics even more.…”
Section: Introductionmentioning
confidence: 99%
“…Additionally, small NDs in the 5 nm range induced relatively little genetic toxicity compared to other nanoparticles [35], and in general NDs have shown insignificant toxicity in all studies [36]. Meanwhile, OLC was shown to have distinctly high absorption at frequencies from 20 Hz to 3 THz, excluding the frequency ranges from 3 GHz to 8 GHz and 53 GHz to 100 GHz [37,38]. OLC was also shown to be an effective absorber in low quantities at infrared frequencies from 10 to 230 THz [39].…”
Section: Introductionmentioning
confidence: 99%