Carbon Nanotubes as Conductive Filler in Segregated Polymer Composites - Electrical Properties

Mamunya, Yevgen

doi:10.5772/18878

Cited by 33 publications

(32 citation statements)

References 68 publications

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“…An arrangement of these aggregates particles carrying percolative pathway and a discrepancy with the theoretical model. The phenomena can be also explained by segregation phenomenon [20]. However, the large presence of this kind of micronic aggregates is incompatible with the concept of homogeneous and isotropic dispersion, which guarantees the mechanical properties maintained.…”

Section: Electrical Conductivity Percolationmentioning

confidence: 97%

Low filled conductive P(VDF-TrFE) composites: Influence of silver particles aspect ratio on percolation threshold from spheres to nanowires

Lonjon¹,

Demont²,

Dantras³

et al. 2012

Journal of Non-Crystalline Solids

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Polymer composites filled with silver nanowires enable the highest value of electrical conductivity known up to now in the case of conductive nanoparticle dispersion with a percolation threshold less than 1 vol%. Silver nanowires with high aspect ratio were elaborated by two types of synthesis: electrochemical deposition in a template and polyol synthesis. For the first time the influence of each kind of nanowires in composites was studied and compared to spherical nanoparticles as reference. The value of percolation threshold and conductivity level above the percolation threshold were measured and compared. These silver nanowires were introduced into poly(vinylidenedifluoride-trifluoroethylene) in comparison to spherical silver nanoparticles. The preparation method modified the effective aspect ratio of nanowires. The low percolation threshold and the microscopy observations confirmed the good dispersion of nanowires in composites. The lowest percolation threshold was determined in the case of the polyol synthesis nanowires (0.63 vol%) in comparison with electrochemical deposited nanowires (2.2 vol%). The level of conductivity above the percolation threshold obtained with each kind of particles is in the same range near 100 S.m −1 . The value of electrical conductivity obtained above the percolation threshold is unusual at this low content of conductive filler and is observed for the first time in a conductive polymer composite.

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Section: Electrical Conductivity Percolationmentioning

confidence: 97%

Low filled conductive P(VDF-TrFE) composites: Influence of silver particles aspect ratio on percolation threshold from spheres to nanowires

Lonjon¹,

Demont²,

Dantras³

et al. 2012

Journal of Non-Crystalline Solids

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“…The electrical conductivity of the thread sensor started to reach steady state value after 4 times of dipping. This related to percolation theory that after the volume ratio reach certain value, the electrical property of carbon nanotube change from nonconductive to conductive state [15]. A graph of relative resistance change (measured using sourcemeter) versus strain is showed in figure 5, as a result of the procedure described in 2.5.…”

Section: Resultsmentioning

confidence: 88%

CNT coated thread micro-electro-mechanical system for finger proprioception sensing

Shafi

Wicaksono

2017

J. Phys.: Conf. Ser.

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Abstract. In this paper, we aim to fabricate cotton thread based sensor for proprioceptive application. Cotton threads are utilized as the structural component of flexible sensors. The thread is coated with multi-walled carbon nanotube (MWCNT) dispersion by using facile conventional dipping-drying method. The electrical characterization of the coated thread found that the resistance per meter of the coated thread decreased with increasing the number of dipping. The CNT coated thread sensor works based on piezoresistive theory in which the resistance of the coated thread changes when force is applied. This thread sensor is sewed on glove at the index finger between middle and proximal phalanx parts and the resistance change is measured upon grasping mechanism. The thread based microelectromechanical system (MEMS) enables the flexible sensor to easily fit perfectly on the finger joint and gives reliable response as proprioceptive sensing.

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“…Increased conductivity or enhanced dielectric properties of a variety of polymers have been studied by many authors [24][25][26][27][86][87][88][89]. This is of particular interest as regards polymers because their properties can be easily modified by doping.…”

Section: Resultsmentioning

confidence: 99%

The role of conductive dopants in polymer cholesteric liquid crystals

Petkoska¹

2014

Maced. J. Chem. Chem. Eng.

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A variety of conductive dopants were used to modify the electric properties of polymer cholesteric liquid crystals. Different types of carbon blacks and carbon nanotubes, as well as metallic particles were used as conductive dopants in this work. All affected the conductivity of the polymer matrix, but at different dopant concentrations. The percolation threshold behavior of used dopants in the polymer host showed pronounced dependence on the dopants" particle size and particle shape anisotropy. For instance, the higher the aspect ratio of carbon-based dopant particles (aspect ratio = length : diametar), the lower the percolation threshold. Additionally, increase in metallic dopants' diameter yielded higher percolation threshold of polymer composition.Keywords: polymer cholesteric liquid crystals; conductive dopants; carbon black; carbon nanotubes; percolation threshold УЛОГА НА СПРОВОДЛИВИ ДОПАНТИ ВО ПОЛИМЕРНИ ХОЛИСТЕРИЧНИ ТЕЧНИ КРИСТАЛИНајразлични спроводливи допанти се користени за модификација на својствата на полимерни холистерични течни кристали. Во овој труд како спроводливи допанти се користени различни видови јаглерод и јаглеродни наноцевки, како и метални честички. Сите тие имаат влијание врз полимерната матрица, но при различни концентрации на допантот. Прагот на перколација на користените допанти во полимерната матрица покажа зависност од големината на честиците на допантот и од анизотропијата на обликот на честиците. На пример, поголем сооднос на должината : диаметарот на допантот го намалува прагот на перколација. Понатаму, зголе-мувањето на дијаметарот на металните честички води кон повисок праг на перколација во полимерната композиција.Клучни зборови: полимерни холистерични течни кристали; спроводливи допанти; јаглерод; јаглеродни наноцевки; праг на перколација

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Carbon Nanotubes as Conductive Filler in Segregated Polymer Composites - Electrical Properties

Cited by 33 publications

References 68 publications

Low filled conductive P(VDF-TrFE) composites: Influence of silver particles aspect ratio on percolation threshold from spheres to nanowires

Low filled conductive P(VDF-TrFE) composites: Influence of silver particles aspect ratio on percolation threshold from spheres to nanowires

CNT coated thread micro-electro-mechanical system for finger proprioception sensing

The role of conductive dopants in polymer cholesteric liquid crystals

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