Unravelling the sensory capability of MWCNT-reinforced nanocomposites: Experimental and numerical investigations

Meguid, S. A.; Xia, Xiaodong; Elaskalany, M.

doi:10.1016/j.carbon.2022.12.037

Cited by 2 publications

(4 citation statements)

References 49 publications

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“…The reason of this trend could be related to the electrical conductivity change of the composite. In the PVDF and GNP complex, GNP could exhibit the electrical pathway via the tunneling effect of electron, it causes increasing electrical conductivity until it reaches the optimum point named the percolation threshold [ 29 , 30 ]. Besides, after going through the percolation threshold, electrical conductivity value arrives at a saturation point, showing that the exponentially increasing trend is typically limited and that the saturation point of performance is exhibited.…”

Section: Resultsmentioning

confidence: 99%

Enhanced capacitive pressure sensing performance by charge generation from filler movement in thin and flexible PVDF-GNP composite films

Kim,

Lim,

Jang

et al. 2023

Science and Technology of Advanced Materials

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This study introduces an approach to overcome the limitations of conventional pressure sensors by developing a thin and lightweight composite film specifically tailored for flexible capacitive pressure sensors, with a particular emphasis on the medium and high pressure range. To accomplish this, we have engineered a composite film by combining polyvinylidene fluoride (PVDF) and graphite nanoplatelets (GNP) derived from expanded graphite (Ex-G). A uniform sized GNPs with an average lateral size of 2.55 av and an average thickness of 33.74 av with narrow size distribution was obtained with a gas-induced expansion of expandable graphite (EXP-G) combined with tip sonication in solvent. By this precisely controlled GNP within the composite film, a remarkable improvement in sensor sensitivity has been achieved, surpassing 4.18 MPa −1 within the pressure range of 0.1 to 1.6 MPa. This enhancement can be attributed to the generation of electric charge from the movement of GNP in the polymer matrix. Additionally, stability testing has demonstrated the reliable operation of the composite film over 1000 cycles. Notably, the composite film exhibits exceptional continuous pressure sensing capabilities with a rapid response time of approximately 100 milliseconds. Experimental validation using a 3 × 3 sensor array has confirmed the accurate detection of specific contact points, thus highlighting the potential of the composite film in selective pressure sensing. These findings signify an advancement in the field of flexible capacitive pressure sensors that offer enhanced sensitivity, consistent operation, rapid response time, and the unique ability to selectively sense pressure.

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Section: Resultsmentioning

confidence: 99%

Enhanced capacitive pressure sensing performance by charge generation from filler movement in thin and flexible PVDF-GNP composite films

Kim,

Lim,

Jang

et al. 2023

Science and Technology of Advanced Materials

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“… The electrical conductivity of the nanocomposite vs. the volume concentration of the CNTs nanofiller: ( a ) the comparison between the theoretical results and experimental measurements in literature [ 22 , 34 , 35 , 36 , 38 , 39 , 40 , 41 ]; ( b ) the electrical conductivity vs. the volume concentration of the CNTs nanofiller; and ( c ) the interfacial electrical conductivity of CNTs and epoxy vs. the aspect ratio of CNTs nanofiller. …”

Section: Figurementioning

confidence: 99%

“…conductive percolation. However, experimental studies [22,[34][35][36][38][39][40][41] have found that CNTs with high aspect ratios also lead to weakened enhancement. Wang et al [42] developed a continuum model that possesses several desirable features of the electrical conduction process in CNTs-based nanocomposites.…”

Section: Theory 21 Coated Cnt Fillersmentioning

confidence: 99%

“…Therefore, the highly conductive CNT filler with a high aspect ratio is conducive to the construction of the percolation conductive network, which means that less filler is needed to complete the construction of the conductive network and reach the conductive percolation. However, experimental studies [ 22 , 34 , 35 , 36 , 38 , 39 , 40 , 41 ] have found that CNTs with high aspect ratios also lead to weakened enhancement. Wang et al [ 42 ] developed a continuum model that possesses several desirable features of the electrical conduction process in CNTs-based nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites

Wang,

Duan,

Gong

et al. 2024

Polymers

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The mechanical/thermal/electrical properties on-demand design of CNTs-reinforced nanocomposites is a key scientific issue that limits the development of new-generation smart nanomaterials, and the establishment of a corresponding unified theoretical prediction model for the mechanical/thermal/electrical properties is the foundation of nanocomposites. Based on the equivalent medium theory (EMT) obtained by Maxwell far-field matching, a unified mechanical/thermal/electrical modified EMT model is established by introducing Young’s modulus, thermal conductivity, and electrical conductivity to the thin filler–matrix’s interlayer. According to literature, the proposed model was employed to theoretically calculate the variations in the overall Young’s modulus, thermal conductivity, and electrical conductivity of CNTs-reinforced nanocomposites with respect to the volume concentration of CNT fillers. Then, the applicability of the proposed theoretical model was validated in comparison with the experimental measurements. Numerical calculations showed that the interface is a key factor affecting the mechanical/thermal/electrical properties of CNTs-reinforced nanocomposites, and strengthening the interfacial effect is an effective way to enhance the overall properties of nanocomposites. In addition, the aspect ratio of CNT fillers also significantly affects the material properties of the CNT fillers interface phase and the CNTs-reinforced nanocomposites. By fitting the experimental data, the calculation expressions of the aspect ratios of CNT fillers on the Young’s modulus, thermal conductivity, and electrical conductivity of the CNT fillers interfacial phase are quantitatively given, respectively.

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Unravelling the sensory capability of MWCNT-reinforced nanocomposites: Experimental and numerical investigations

Cited by 2 publications

References 49 publications

Enhanced capacitive pressure sensing performance by charge generation from filler movement in thin and flexible PVDF-GNP composite films

Enhanced capacitive pressure sensing performance by charge generation from filler movement in thin and flexible PVDF-GNP composite films

Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites

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