Modeling electrical conductivity of nanocomposites by considering carbon nanotube deformation at nanotube junctions

Gong, Shen; Zhu, Zheng H.; Haddad, E.

doi:10.1063/1.4818478

Cited by 70 publications

(56 citation statements)

References 49 publications

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“…[ 35,112,119,120 ] Recently, the validation of simulation results was remarkably improved by considering the deformation of CNT walls in the contact areas. [ 112,121 ] It was demonstrated that the increase of the contact resistance due to the increase of the intrinsic resistance of CNT cause by the wall deformation is signifi cant. Simulations indicated that the tunneling resistance change is the main mechanism of the piezoresistivity of CNTs-polymer nanocomposite strain sensors.…”

Section: Computational Analysismentioning

confidence: 99%

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,549

2,129

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wileyonlinelibrary.comSkin-mountable and wearable sensors can be attached onto the clothing or even directly mounted on the human skin for the real-time monitoring of human activities. [ 10 ] Besides their high effi ciency, they must fulfi ll several minimum requirements including high stretchability, fl exibility, durability, low power consumption, biocompatibility, and lightweight. These demands become even more severe for epidermal electronic devices where mechanical compliance like human skin and high stretchability ( ε > 100% where ε is the strain) are required. [ 11,12 ] Recently, several types of skin-mountable and wearable sensors have been proposed by using nanomaterials coupled with fl exible and stretchable polymers. Indeed, nanomaterials are utilized as functional sensing elements owing to their outstanding electrical, mechanical, optical, and chemical properties while polymers are employed as fl exible support materials thanks to their fl exibility, stretchability, humanfriendliness, and durability. [ 13 ] Examples of those innovative sensors include strain sensors, [ 10,[12][13][14] pressure sensors, [ 5,[15][16][17] electronic skins (e-skins), [ 3,[16][17][18][19][20] and temperature sensors. [ 2,21,22 ] Particularly, various skin-mountable and wearable strain sensors have been developed because of their broad applications in personalized heath-monitoring, human motion detection, human-machine interfaces, and soft robotics. [ 10,12,[23][24][25][26][27][28][29][30][31] This paper aims to survey fabrication processes, working mechanisms, strain sensing performances, and applications of stretchable strain sensors. The article is organized as follows: fi rst, common operation mechanisms of stretchable strain sensors are described. Here, we summarize novel functional nanomaterials and techniques for the fabrication of stretchable strain sensors in details. Second, mechanisms involved in the strain-responsive behavior of resistive-type and capacitive-type sensors are explained. We show that the infl uence of traditional mechanisms like geometrical changes and piezoresistivity of materials on the strain sensing performance of fl exible strain sensors are very small whereas mechanisms such as disconnection between sensing elements, crack propagation in thin fi lms, and tunneling effect can potentially be employed for highly stretchable and sensitive strain sensing. Third, we emphasize the performance parameters of stretchable strain sensors in terms of stretchability, sensitivity, linearity, hysteresis behavior, response time, overshooting, and durability. We demonstrate

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Section: Computational Analysismentioning

confidence: 99%

Stretchable, Skin‐Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,549

2,129

View full text Add to dashboard Cite

show abstract

“…With the above definitions, the intrinsic resistance along a deformed CNT between two nearest contact points j and k with the neighboring CNTs, as shown in figure 2(a), can be evaluated as, [25] ( ) ( )…”

Section: (B) and D' Vdw Is Thementioning

confidence: 99%

“…Thus, there is a minimum diameter D' min of the deformed CNT or a minimum distance d' vdw_min between CNTs [25]. The contact resistance at CNT junctions can be derived by the Landauer-Büttiker formula [24],…”

Section: (B) and D' Vdw Is Thementioning

confidence: 99%

“…The unknown parameter D' or d' vdw can be determined by minimizing a pseudo-potential energy at the crossed CNT junction defined in [25]. Fig.…”

Section: (B) and D' Vdw Is Thementioning

confidence: 99%

“…The CNT deformation dramatically increases the intrinsic resistance of CNTs and decreases the CNT contact or tunneling resistance [31,36]. To attenuate the problem of CNT overlap, the effect of CNT wall deformation was considered in the models of the intrinsic and contact resistance recently [25]. The simulation results reveal that the CNT wall deformation is a major mechanism leading to the overall increase of electrical resistance of CNT percolation networks.…”

Section: Introductionmentioning

confidence: 97%

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