A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films

He, Yang; Li, Wei; Yang, Guilin; Líu, Hao; Lu, Junyu; Zheng, Tongtong; Li, Xiaojiu

doi:10.3390/ma10070684

Cited by 38 publications

(27 citation statements)

References 41 publications

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“…The piezoresistive sensitivity of the composites can be expressed as the following formula [ 32 ]:

∆P is the relative loaded compressive force, R 0 is initial resistance and R is the resistance. Table 3 summarizes the sensitivity of the composites under varying applied pressures.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring

Yue

Wei

et al. 2018

Sensors

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A facile method for preparing an easy processing, repeatable and flexible pressure sensor was presented via the synthesis of modified multi-walled carbon nanotubes (m-MWNTs) and polyurethane (PU) films. The surface modification of multi-walled carbon nanotubes (MWNTs) simultaneously used a silane coupling agent (KH550) and sodium dodecyl benzene sulfonate (SDBS) to improve the dispersibility and compatibility of the MWNTs in a polymer matrix. The electrical property and piezoresistive behavior of the m-MWNT/PU composites were compared with raw multi-walled carbon nanotube (raw MWNT)/PU composites. Under linear uniaxial pressure, the m-MWNT/PU composite exhibited 4.282%kPa−1 sensitivity within the pressure of 1 kPa. The nonlinear error, hysteresis error and repeatability error of the piezoresistivity of m-MWNT/PU decreased 9%, 16.72% and 54.95% relative to raw MWNT/PU respectively. Therefore, the piezoresistive response of m-MWNT/PU had better stability than that of raw MWNT/PU composites. The m-MWNT/PU sensors could be utilized in wearable devices for body movement detection, monitoring of respiration and pressure detection in garments.

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“…The piezoresistive sensitivity of the composites can be expressed as the following formula [ 32 ]:

∆P is the relative loaded compressive force, R 0 is initial resistance and R is the resistance. Table 3 summarizes the sensitivity of the composites under varying applied pressures.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring

Yue

Wei

et al. 2018

Sensors

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“…Some of the commonly studied elastomers included polyvinylidene fluoride (PVDF) [10], polyurethanes [9,11], styrene-butadiene rubber [12] and natural rubber latex or natural rubber [9,13]. In current research, GO modified elastomer has been developed by different groups [8][9][10][11][12][13][14][15], they were mainly synthesized by traditional methods such as melt mixing [8], solution/latex blending [8,9,11,12], in-situ polymerization [8], and film processing [10,13]. The GO modified elastomers showed stronger mechanical properties than the corresponding pure elastomers [13,15].…”

Section: Introductionmentioning

confidence: 99%

GO-modified flexible polymer nanocomposites fabricated via 3D stereolithography

Tsang

Zhakeyev

Leung

et al. 2019

Front. Chem. Sci. Eng.

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Graphene oxide (GO) induced enhancement of elastomer properties showed a great deal of potential in recent years, but it is still limited by the barrier of the complicated synthesis processes. Stereolithography (SLA), used in fabrication of thermosets and very recently in "flexible" polymers with elastomeric properties, presents itself as simple and user-friendly method for integration of GO into elastomers. In this work, it was first time demonstrated that GO loadings can be incorporated into commercial flexible photopolymer resins to successfully fabricate GO/elastomer nanocomposites via readily accessible, consumer-oriented SLA printer. The material properties of the resulting polymer was characterized and tested. The mechanical strength, stiffness, and the elongation of the resulting polymer decreased with the addition of GO. The thermal properties were also adversely affected upon the increase in the GO content based on differential scanning calorimetry and thermogravimetric analysis results. It was proposed that the GO agglomerates within the 3D printed composites, can result in significant change in both mechanical and thermal properties of the resulting nanocomposites. This study demonstrated the possibility for the development of the GO/elastomer nanocomposites after the optimization of the GO/"flexible" photoreactive resin formulation for SLA with suitable annealing process of the composite in future.

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“…The piezoresistive sensitivity of the TPU/CNT sensing elements can be expressed by the following formula [29]:…”

Section: Piezoresistive Sensitivitymentioning

confidence: 99%

Study on the forming and sensing properties of laser-sintered TPU/CNT composites for plantar pressure sensors

Zhuang

Guo

et al. 2021

Int J Adv Manuf Technol

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Conductive polymer composites (CPCs) combining with specific microstructures (micropores, microcracks, etc.) can exhibit unique resistance response changes, which can be widely regarded as an effective way to improve sensing performance. This study takes advantage of the characteristics of the formation of tiny pores between crystal grains during selective laser sintering (SLS) processing to introduce a microporous structure into the thermoplastic polyurethane (TPU)/carbon nanotube (CNT) sensing element to prepare a three-dimensional porous conductive structure. The effect of the SLS process on sensing sensitivity, accuracy, and density was studied, and its sensing and forming mechanism were discussed. By adjusting SLS process parameters to control the performance of porous structure sensor elements, a final TPU/CNT sensor element with a wide pressure detection range, high sensitivity, a fast response time, and good stability and durability was developed. Finally, the optimal performance of the developed flexible pressure sensor was successfully used to detect the pressure distribution of the human foot. This study provided a simple and effective research method to develop high-performance flexible pressure sensors.

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A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films

Cited by 38 publications

References 41 publications

Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring

Highly Stable and Flexible Pressure Sensors with Modified Multi-Walled Carbon Nanotube/Polymer Composites for Human Monitoring

GO-modified flexible polymer nanocomposites fabricated via 3D stereolithography

Study on the forming and sensing properties of laser-sintered TPU/CNT composites for plantar pressure sensors

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