Effect of orientation on the piezoresistivity of mechanically drawn single walled carbon nanotube (SWCNT) thin films

Obitayo, Waris; Liu, Tao

doi:10.1016/j.carbon.2014.12.095

Cited by 24 publications

(20 citation statements)

References 56 publications

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“…For instance, metal-coated CNT-epoxy nanocomposites (GFs ≈ 155) (Figure 4 d) and CNTs-graphite fl ake hybrid thin fi lm coated on PET (GFs ≈ 7.8) showed high linearity and sensitivity, but with very low stretchability (ε ≤ 1.5%). [ 32,72,73,78,114 ] Capacitive-type sensors showed excellent linearity, but with low sensitivity ( Figure 5 c and Figure 6 ). [ 58,65 ] In overall, we found a trade-off relationship between "high sensitivity" and "high linearity and stretchability" in majority of strain sensors ( Figure 6 ).…”

Section: Linearitymentioning

confidence: 99%

“…Physical, chemical, biological, and environmental status of the human body could be monitored by various fl exible sensors with high effi ciency and minimum discomfort. [1][2][3][4][5][6][7][8][9] Stretchable strain sensors were fabricated through different processes including fi ltration method, [ 10,47,58,71,73,79,80 ] printing technology, [ 57,65,66,71 ] transferring and micromolding methods, [ 14,50,52,55,56,58,60 ] coating techniques, [ 49,54,61,63,72,78,79 ] liquid phase mixing, [ 12,51,52,60,62,71,77,81 ] and chemical synthesis methods. [ 14,55,56,76,82 ] We have recently reported highly stretchable and sensitive strain sensors based on the silver nanowires (AgNWs)-elastomer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,641

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: Linearitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Amjadi

Kyung

Park

et al. 2016

Adv Funct Materials

2,641

2,129

View full text Add to dashboard Cite

show abstract

“…Figure a shows a prototypical device and Figure b shows its relative resistance change when subjected to a cyclic tensile deformation up to a maximum strain of 10%. The gauge factor (GF = ( R / R 0 – 1)/ε) of the PDMS/PCP flexible strain sensor was estimated to be about 21, which is comparable to the flexible sensors made of other types of carbon materialsgraphene, − carbon nanotubes, − graphite, and so forth.…”

Section: Results and Discussionmentioning

confidence: 77%

Direct Laser Writing-Assisted Method for Template-Free Fabrication of Biomass-Based Porous Carbon Platelets with Uniform Size and Arbitrarily Designed Shapes

et al. 2019

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Because of a wide range of applications of porous carbon platelets (PCPs), a robust method for their facile synthesis/fabrication with controlled porous structure, size, and shape is constantly needed. Herein, we report a simple and scalable method for producing PCPs with uniform size and arbitrarily designed shapes. This approach relies on CO 2 laser irradiation to induce carbonization of a biomass composite sheet formed by the infusion of sodium lignosulfonate into a cellulose paper to create porous carbon features with arbitrarily designed shapes. Upon subsequent water immersion treatment, the laser-written carbon features could spontaneously detach to form freestanding PCPs. The PCPs of different shapes were fabricated, characterized, and demonstrated for their potential applications in dye adsorption, as flexible sensors, and as miniaturized supercapacitors. Our method is expected to make great impacts in multiple fields, such as environment, energy storage, sensing, catalysis, and so forth.

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“…According to the recorded electrical resistance, the sheet resistance of the thin film sample – R s was calculated by R s = R × (W/L). More information on the coupled electrical–mechanical testing protocol and apparatus can be found in our previous work [ 31 , 32 ]…”

Section: Methodsmentioning

confidence: 99%

Engineering Crack Formation in Carbon Nanotube-Silver Nanoparticle Composite Films for Sensitive and Durable Piezoresistive Sensors

et al. 2016

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We report highly sensitive and reliable strain sensors based on silver nanoparticle (AgNP) and carbon nanotube (CNT) composite thin films. The CNT/AgNP was prepared by a screen printing process using a mixture of a CNT paste and an AgNP ink. It is discovered that the sensitivity of such sensors are highly dependent on the crack formation in the composites. By altering the substrate use and the relative ratios of AgNPs and CNTs, the formation and propagation of cracks can be properly engineered, leading to piezoresistive strain sensors with enhanced sensitivity and robustness.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1626-z) contains supplementary material, which is available to authorized users.

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Effect of orientation on the piezoresistivity of mechanically drawn single walled carbon nanotube (SWCNT) thin films

Cited by 24 publications

References 56 publications

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

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

Direct Laser Writing-Assisted Method for Template-Free Fabrication of Biomass-Based Porous Carbon Platelets with Uniform Size and Arbitrarily Designed Shapes

Engineering Crack Formation in Carbon Nanotube-Silver Nanoparticle Composite Films for Sensitive and Durable Piezoresistive Sensors

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