Preparation of piezoresistive nano smart hybrid material based on graphene

Kim, Young‐Ju; Young, J.B.; Ham, Heon; Huh, Hoon; So, Dae-Sup; Kang, Inpil

doi:10.1016/j.cap.2010.11.022

Cited by 131 publications

(86 citation statements)

References 9 publications

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“…Only within a low strain value (1.0%), the piezoresistive response of carbon nano-blacks or MWNT nanocomposites [23] can be approximated fairly well with a linear function. For graphene/epoxy nanocomposite sensors in [35], an approximate linear behavior within ±1,000 με was identified.For the relationship between the piezoresistivity ( i.e. , sensor sensitivity or gauge factor) and the CNT loading, in most of previous studies for MWNTs and carbon nanofibers (e.g., VGCFs) [18,19,21–24,26–28,30,31,34], and for SWNTs [15], it was found that with the decrease of CNT loading, the piezoresistivity or sensor sensitivity increases monotonically.…”

Section: Piezoresistivity Of Cnfs/polymer Nanocompositesmentioning

confidence: 99%

Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites

Alamusi

Fukunaga

et al. 2011

Sensors

540

292

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In recent years, nanocomposites based on various nano-scale carbon fillers, such as carbon nanotubes (CNTs), are increasingly being thought of as a realistic alternative to conventional smart materials, largely due to their superior electrical properties. Great interest has been generated in building highly sensitive strain sensors with these new nanocomposites. This article reviews the recent significant developments in the field of highly sensitive strain sensors made from CNT/polymer nanocomposites. We focus on the following two topics: electrical conductivity and piezoresistivity of CNT/polymer nanocomposites, and the relationship between them by considering the internal conductive network formed by CNTs, tunneling effect, aspect ratio and piezoresistivity of CNTs themselves, etc. Many recent experimental, theoretical and numerical studies in this field are described in detail to uncover the working mechanisms of this new type of strain sensors and to demonstrate some possible key factors for improving the sensor sensitivity.

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Section: Piezoresistivity Of Cnfs/polymer Nanocompositesmentioning

confidence: 99%

Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites

Alamusi

Fukunaga

et al. 2011

Sensors

540

292

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“…In this system, the resistance response under applied strains mainly comes from the contact resistance with connected fl akes and tunneling effect from neighboring fl akes, whereas the resistance of individual graphene fl akes is hardly changed due to the stable crystal structure. [ 24 ] To avoid the structure collapse, graphene fl akes are often incorporated in a polymer or elastomer matrix, such as epoxy, [ 24 ] rubber, [ 25 ] nanocellulose, [ 26 ] polyvinylidene fl uoride, [ 27 ] polyimide, [ 28 ] poly(vinyl alcohol), [ 29 ] and carbon nanotube (CNT). [ 30 ] Especially, the resulting graphene-based strain sensors could work under strains of over 800%, demonstrating large stretchability.…”

Section: Introductionmentioning

confidence: 99%

Large‐Area Ultrathin Graphene Films by Single‐Step Marangoni Self‐Assembly for Highly Sensitive Strain Sensing Application

Yang

et al. 2016

Adv Funct Materials

342

259

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1322 wileyonlinelibrary.com applications in fi elds of healthcare monitoring, human-computer interaction, and electronic skin. [ 12 ] The relative resistance Δ R normalized by the initial resistance R 0 depends on Poisson's ratio ( ν ) and resistivity variation (Δ ρ ) normalized by its initial resistivity ρ 0 through the expression ΔR / R 0 = (1 + 2ν) ε + Δ ρ / ρ 0.[ 13 ] The sensitivity revealed by gauge factor (GF, defi ned as ( ΔR / R 0 )/ ε ) depends on both intrinsic property and structural feature. According to this formula, graphene-based strain sensors have shown low sensitivities due to the rigid and stable structure of intrinsic graphene. [ 14 ] With hardly opened band gap, the GF of a suspended graphene is only about 1.9 under moderate uniaxial strains. [ 15 ] Therefore, structural engineering of graphene is needed to boost the sensitivity of graphene-based strain sensors.Adjustment of the connection channels in graphene is an effective way to alter its resistivity for improved sensitivity in strain sensors. Two common methods for the structural construction of graphene include high temperature processing based chemical vapor deposition (CVD) and solution processing based sheets/fl akes assembly. As for CVD, the resistivity of graphene would be affected by its grain boundary, grain size, and the defect density. [16][17][18] Continuous graphene fi lms grown by CVD could sustain 1% strain with a GF of only 6.1, [ 19 ] and the GF increases to 151 for a 5% strain due to the morphological Large-Area Ultrathin Graphene Films by Single-Step Marangoni Self-Assembly for Highly Sensitive Strain Sensing ApplicationXinming Li , Tingting Yang , Yao Yang , Jia Zhu , Li Li , Fakhr E. Alam , Xiao Li , Kunlin Wang , Huanyu Cheng , Cheng-Te Lin , * Ying Fang , * and Hongwei Zhu * Promoted by the demand for wearable devices, graphene has been proved to be a promising material for potential applications in fl exible and highly sensitive strain sensors. However, low sensitivity and complex processing of graphene retard the development toward the practical applications. Here, an environment-friendly and cost-effective method to fabricate large-area ultrathin graphene fi lms is proposed for highly sensitive fl exible strain sensor. The assembled graphene fi lms are derived rapidly at the liquid/air interface by Marangoni effect and the area can be scaled up. These graphene-based strain sensors exhibit extremely high sensitivity with gauge factor of 1037 at 2% strain, which represents the highest value for graphene platelets at this small deformation so far. This simple fabrication for strain sensors with highly sensitive performance of strain sensor makes it a novel approach to applications in electronic skin, wearable sensors, and health monitoring platforms.

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“…However, recently flexible, low stiffness, highly sensitive, cost-efficient sensors made from polymer based nanocomposites have been shown to be ideal for use in next generation wearable smart materials and flexible electronics. [6][7][8] Nanocomposite sensing materials consisting of an elastic polymer matrix loaded with conductive carbon-based nanomaterials [9][10][11][12][13][14][15][16][17][18][19][20][21][22] have been utilized to try and meet the above criteria. In such nanocomposites, when strain is applied the distance between conductive fillers inside the polymer matrix changes, causing large resistive changes, resulting in sensitivities much larger than that of commercial strain sensors.…”

mentioning

confidence: 99%

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

et al. 2017

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Abstract:Integrated sensors for bodily measurements require a sensing material that are highly conductive, flexible, thin and sensitive. It is important that these materials be non-invasive in application but robust in nature to allow for effective, continuous measurement. Herein, we report a comparative study of two simple, scalable methods to produce silver nanowire (AgNW) polyurethane (PU) composite materials: layer-by-layer (LBL) and mixed filtration.Both types of composites formed were ultrathin (~50 µm) and highly conductive (10 4 S/m), with the LBL method ultimately found to be superior due to its low percolation threshold.Electrical resistance of the LBL composites was found to vary with strain, making these materials suitable for strain sensing. LBL composites displayed a working strain up to ~250% and a high gauge factor (G), with values of G~70 reported. The sensors reported here were ~10 9 -times more conductive and ~10 4 -times thinner than their carbon-based composite sensor counterparts with similar gauge factor. This made the strain sensors presented here among one of the most flexible, highly sensitive, thinnest, conductive materials in literature.We demonstrated that with these properties, the LBL composites formed were ideal for bodily motion detection. Introduction:

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Preparation of piezoresistive nano smart hybrid material based on graphene

Cited by 131 publications

References 9 publications

Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites

Piezoresistive Strain Sensors Made from Carbon Nanotubes Based Polymer Nanocomposites

Large‐Area Ultrathin Graphene Films by Single‐Step Marangoni Self‐Assembly for Highly Sensitive Strain Sensing Application

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

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