Strain-dependent electrical resistance of multi-walled carbon nanotube/polymer composite films

Park, Myounggu; Kim, Hyonny; Youngblood, Jeffrey P.

doi:10.1088/0957-4484/19/05/055705

Cited by 305 publications

(248 citation statements)

References 23 publications

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“…The sensitivity of polymer/CNT composites to strain has been previously reported to be dependent on a number of parameters like CNT loading [54] and CNT alignment [55]. In our case the concentration of CNT is invariant and the change in draw down ratio is insufficient to justify significant differences in particle orientation.…”

Section: Manufacture Of Conductive and Strain Sensitive Fibresmentioning

confidence: 69%

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Bilotti

Zhang

Deng

et al. 2013

Composites Science and Technology

154

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In this paper, the electrical properties of ternary nanocomposites based on thermoplastic polyurethane (TPU) and multi-walled carbon nanotubes (MWCNTs) are studied. In particular two nanofillersdiffering in shape and electrical properties -are used in conjunction with MWCNTs: an electrically conductive CB and an insulating needle-like nanoclay, sepiolite. The ternary nanocomposites were manufactured in a number of forms (extruded pellets, filaments, and compression moulded films) and their morphological and electrical properties characterised as function of time and temperature. The presence of both secondary nanofillers is found to affect the formation of a percolating network of MWCNTs in TPU, inducing a reduced percolation threshold and tuneable strain sensing ability.These ternary nanocomposites can find application as conductive and multi-functional materials for flexible electronics, sensing films and fibres in smart textiles.

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Section: Manufacture Of Conductive and Strain Sensitive Fibresmentioning

confidence: 69%

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Bilotti

Zhang

Deng

et al. 2013

Composites Science and Technology

154

View full text Add to dashboard Cite

show abstract

“…In general, the resistance change of CNT networks can be attributed to not only the stress-dependent resistivity of the nanotube structure, but also the stress-dependent change of the nanotube network geometry, nanotube-nanotube interspace, contact area and density (junction point per unit volume) [19]. Therefore, the resistance change is normally explained by superposing a modified percolation-based scaling rule [25] (related to the linear resistance change region) with relationships describing tunneling resistance (related to the nonlinear resistance change region) [26]. In our case, the locally high concentration of MWCNTs on our cellulose fiber surface can be considered as overlapping at the contact locations, rather than being arranged in an end-to-end configuration.…”

Section: Piezoresistivity Of Mwcnt-coated Cellulose Fibersmentioning

confidence: 99%

Smart Cellulose Fibers Coated with Carbon Nanotube Networks

Liu

Mäder

2014

Fibers

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Smart multi-walled carbon nanotube (MWCNT)-coated cellulose fibers with a unique sensing ability were manufactured by a simple dip coating process. The formation of electrically-conducting MWCNT networks on cellulose mono-and multi-filament fiber surfaces was confirmed by electrical resistance measurements and visualized by scanning electron microscopy. The interaction between MWCNT networks and cellulose fiber was investigated by Raman spectroscopy. The piezoresistivity of these fibers for strain sensing was investigated. The MWCNT-coated cellulose fibers exhibited a unique linear strain-dependent electrical resistance change up to 18% strain, with good reversibility and repeatability. In addition, the sensing behavior of these fibers to volatile molecules (including vapors of methanol, ethanol, acetone, chloroform and tetrahydrofuran) was investigated. The results revealed a rapid response, high sensitivity and good reproducibility for these chemical vapors. Besides, they showed good selectivity to different vapors. It is suggested that the intrinsic physical and chemical features of cellulose fiber, well-formed MWCNT networks and favorable MWCNT-cellulose interaction caused the unique and excellent sensing ability of the MWCNT-coated cellulose fibers, which have the potential to be used as smart materials.

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“…Loh et al [12] used a layer-by-layer fabrication method to prepare carbon nanotube-polyelectrolyte thin film for strain and corrosion sensing. Park et al [13] investigated the strain-dependent electrical resistance characteristics of MWCNT/PEO composite films using an experimental set-up simultaneously to measure electrical resistance and strain, and found repeatable relations in resistance versus strain. Li et al [14] conducted an experimental study on MWCNT films and investigated their potential use as strain sensors.…”

Section: Introductionmentioning

confidence: 99%

Strain sensing using a multiwalled carbon nanotube film

Vemuru

Wahi

Nagarajaiah

et al. 2009

The Journal of Strain Analysis for Engineering Design

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The effectiveness of multiwalled carbon nanotubes (MWCNTs) as strain sensors is investigated. The key contribution of this paper is the study of real-time strain response at the macroscale of MWCNT film under tensile load. In addition, real-time voltage change as a function of temperature is examined. MWCNT films attached to a brass specimen by epoxy using vacuum bonding have been studied. The brass specimen is subjected to tensile loading, and voltage output from the MWCNT film is obtained using a four-point probe and a sensitive voltage measurement device. Experimental results show that there is a linear change in voltage across the film when subjected to tension, and the MWCNT film both fully recovers its unstressed state upon unloading and exhibits stable electromechanical properties. The effect of temperature on the voltage output of the nanotube film under no load condition is investigated. From the results obtained it is evident that MWCNT films exhibit a stable and predictable voltage response as a function of temperature. An increase in temperature leads to an increase in conductivity of the nanotube film. The study of MWCNT film for real-time strain sensing at the macroscale is very promising, and the effect of temperature on MWCNT film (with no load) can be reliably predicted.

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Strain-dependent electrical resistance of multi-walled carbon nanotube/polymer composite films

Cited by 305 publications

References 23 publications

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Controlling the dynamic percolation of carbon nanotube based conductive polymer composites by addition of secondary nanofillers: The effect on electrical conductivity and tuneable sensing behaviour

Smart Cellulose Fibers Coated with Carbon Nanotube Networks

Strain sensing using a multiwalled carbon nanotube film

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