Lightweight, flexible and highly sensitive segregated microcellular nanocomposite piezoresistive sensors for human motion detection

Ma, Zhonglei; Wei, Ajing; Li, Yuntao; Shao, Liang; Zhang, Hongming; Xiang, Xiaolian; Wang, Jingping; Ren, Qinbo; Kang, Songlei; Dong, Diandian; Ma, Jianzhong; Zhang, Guangcheng

doi:10.1016/j.compscitech.2020.108571

Cited by 94 publications

(59 citation statements)

References 48 publications

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“…This result is induced by the gradual destruction of the conductive network and the steric hindrance affecting electron transfer with an increasing strain, thus leading to increased resistance [34]. It is surprising that the ∆R/R0 of the composite from the two roll method shows a contrary variation trend with strain when compared with that of the composites from the other two systems (Figure 7b,c), and similar trends have been found in the literature [31,35]. Regarding the two roll method, the structural change of the segregated conductive network is greater at a high MWCNT content due to the high segregated conductive network density (Figure 3a), thus, ∆R/R0 is higher at a high MWCNT content than that at a low MWCNT content.…”

Section: The Strain Sensing Behaviors Under Uniaxial Strainsupporting

confidence: 82%

“…Moreover, the two roll method exhibits a higher volume conductivity below the threshold content 3 wt.%, which is related to the formation of the segregated conductive networks. The segregated conductive network has been reported to be the most promising strategy to significantly decrease the percolation threshold and the dense conductive paths at low filler loading [ 31 ]. However, the conductivity of composite from the two roll method is lower than that of the composite prepared by the other two methods when the MWCNT content exceeds the threshold.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Liu

Guo

et al. 2021

Nanomaterials

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The dispersion, electrical conductivities, mechanical properties and resistance–strain response behaviors of multiwalled carbon nanotube (MWCNT)/natural rubber (NR) composites synthesized by the different processing conditions are systematically investigated at both macro- and micro-perspectives. Compared with the solution and flocculation methods, the two roll method produced the best MWCNTs distribution since the materials are mixed by strong shear stress between the two rolls. An excellent segregated conductive network is formed and that a low percolation threshold is obtained (~1 wt.%) by the two roll method. Different from the higher increases in conductivity for the composites obtained by the solution and flocculation methods when the MWCNT content is higher than 3 wt.%, the composite prepared by the two roll method displays obvious improvements in its mechanical properties. In addition, the two roll method promotes good stability, repeatability, and durability along with an ultrahigh sensitivity (GFmax = 974.2) and a large strain range (ε = 109%). The ‘shoulder peak’ phenomenon has not been observed in the composite prepared by the two roll method, confirming its potential for application as a large deformation monitoring sensor. Moreover, a mathematical model is proposed to explain the resistance–strain sensing mechanism.

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Section: The Strain Sensing Behaviors Under Uniaxial Strainsupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Liu

Guo

et al. 2021

Nanomaterials

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“…In addition, the conductive fillers form a single continuous network structure and the polymer particles tend to exist in isolation after the polymer particles covered with conductive fillers are hot pressed, resulting in poor mechanical properties of polymer matrix EMI shielding composites. Therefore, while maintaining the excellent EMI shielding performance of segregated polymer matrix EMI shielding composites, further optimization of mechanical properties and manufacturing costs is the key to achieving large-scale applications [98][99][100].…”

Section: Segregated Polymer Matrix Emi Shielding Compositesmentioning

confidence: 99%

Structural Design Strategies of Polymer Matrix Composites for Electromagnetic Interference Shielding: A Review

et al. 2021

Self Cite

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With the widespread application of electronic communication technology, the resulting electromagnetic radiation pollution has been significantly increased. Metal matrix electromagnetic interference (EMI) shielding materials have disadvantages such as high density, easy corrosion, difficult processing and high price, etc. Polymer matrix EMI shielding composites possess light weight, corrosion resistance and easy processing. However, the current polymer matrix composites present relatively low electrical conductivity and poor EMI shielding performance. This review firstly discusses the key concept, loss mechanism and test method of EMI shielding. Then the current development status of EMI shielding materials is summarized, and the research progress of polymer matrix EMI shielding composites with different structures is illustrated, especially for their preparation methods and evaluation. Finally, the corresponding key scientific and technical problems are proposed, and their development trend is also prospected. "Image missing"

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“…The structure–property relationships of TPAEs have been extensively studied [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. For example, TPAEs consisting of PTMG has been mostly used for footwear [ 11 , 12 , 13 , 14 ] and gas separation [ 15 , 16 ], while those containing PEG as a flexible phase are employed to selectively separate CO 2 [ 17 , 18 , 19 , 20 ] and permanent antistatic packaging [ 21 ]. It should be noted that PTMG and PEG are a semicrystalline C4 building block and C2 building block, respectively.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Thermoplastic Polyamide Elastomers Based on Amorphous Polyetheramine with Damping Performance

et al. 2021

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Novel thermoplastic polyamide elastomers (TPAEs) consisting of long-chain semicrystalline polyamide 1212 (PA1212) and amorphous polyetheramine were synthesized via one-pot melt polycondensation. The method provides accessible routes to prepare TPAEs with a high tolerance of compatibility between polyamide and polyether oligomers compared with the traditional two-step method. These TPAEs with 10 wt % to 76 wt % of soft content were obtained by reaction of dodecanedioic acid, 1,12-dodecanediamine, and poly(propylene glycol) (PPG) diamine. The structure–property relationships of TPAEs were systematically studied. The chemical structure and the morphologic analyses have revealed that microphase separation occurs in the amorphous region. The TPAEs that have long-chain PPG segments consist of a crystalline polyamide domain, amorphous polyamide-rich domain, and amorphous polyetheramine-rich domain, while the ones containing short-chain PPG segments comprise of a crystalline polyamide domain and miscible amorphous polyamide phase and amorphous polyetheramine phase due to the compatibility between short-chain polyetheramine and amorphous polyamide. These novel TPAEs show good damping performance at low temperature, especially the TPAEs that incorporated 76 wt % and 62 wt % of PPG diamine. The TPAEs exhibit high elastic properties and low residual strain at room temperature. They are lightweight with density between 1.01 and 1.03 g/cm3. The long-chain TPAEs have well-balanced properties of low density, high elastic return, and high shock-absorbing ability. This work provides a route to expand TPAEs to damping materials with special application for sports equipment used in extremely cold conditions such as ski boots.

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Lightweight, flexible and highly sensitive segregated microcellular nanocomposite piezoresistive sensors for human motion detection

Cited by 94 publications

References 48 publications

Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Effect of the Processing on the Resistance–Strain Response of Multiwalled Carbon Nanotube/Natural Rubber Composites for Use in Large Deformation Sensors

Structural Design Strategies of Polymer Matrix Composites for Electromagnetic Interference Shielding: A Review

Facile Synthesis of Thermoplastic Polyamide Elastomers Based on Amorphous Polyetheramine with Damping Performance

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