Mechanical, Electrical, and Piezoresistive Sensing Characteristics of Epoxy-Based Composites Incorporating Hybridized Networks of Carbon Nanotubes, Graphene, Carbon Nanofibers, or Graphite Nanoplatelets

Wang, Xiaodong; Wang, Jianchao; Biswas, Swarup; Kim, Hyeok; Nam, I.W.

doi:10.3390/s20072094

Cited by 24 publications

(34 citation statements)

References 37 publications

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“…Hybrid doping methods were also reported by combining different types of fillers. Examples include carbon black and carbon fibers [31], carbon black and block-copolymer styrene-ethylene-butylene-styrene [21], carbon nanotubes and nickel fibers [32], carbon nanotubes and carbon nanofibers, carbon nanotubes and graphene, and carbon nanotubes and graphene nanoplatelets [33]. The fillers with higher aspect ratios were found to be more effective in terms of sensing capabilities and mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Smart Graphite–Cement Composite for Roadway-Integrated Weigh-In-Motion Sensing

Birgin

D’Alessandro

Laflamme

et al. 2020

Sensors

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Smart multifunctional composites exhibit enhanced physical and mechanical properties and can provide structures with new capabilities. The authors have recently initiated a research program aimed at developing new strain-sensing pavement materials enabling roadway-integrated weigh-in motion (WIM) sensing. The goal is to achieve an accurate WIM for infrastructure monitoring at lower costs and with enhanced durability compared to off-the-shelf solutions. Previous work was devoted to formulating a signal processing algorithm for estimating the axle number and weights, along with the vehicle speed based on the outputs of a piezoresistive pavement material deployed within a bridge deck. This work proposes and characterizes a suitable low-cost and highly scalable cement-based composite with strain-sensing capabilities and sufficient sensitivity to meet WIM signal requirements. Graphite cement-based smart composites are presented, and their electromechanical properties are investigated in view of their application to WIM. These composites are engineered for scalability owing to the ease of dispersion of the graphite powder in the cement matrix, and can thus be used to build smart sections of road pavements. The research presented in this paper consists of electromechanical tests performed on samples of different amounts of graphite for the identification of the optimal mix in terms of signal sensitivity. An optimum inclusion level of 20% by weight of cement is obtained and selected for the fabrication of a plate of 30 × 15 × 5 cm3. Results from load identification tests conducted on the plate show that the proposed technology is capable of WIM.

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Section: Introductionmentioning

confidence: 99%

Smart Graphite–Cement Composite for Roadway-Integrated Weigh-In-Motion Sensing

Birgin

D’Alessandro

Laflamme

et al. 2020

Sensors

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“…The electrical resistance was converted to an electrical conductivity with consideration of the composite sample dimension. An equation that converts electrical resistance measured by the two-probe method to electrical conductivity was provided as follows [23,33].…”

Section: Methodsmentioning

confidence: 99%

“…R indicates electrical resistance measured from the samples. L and A denote distance between the electrodes and cross sectional area of sample that is contacted to the electrode, respectively [23,33]. Details of the electrical conductivity assessment can be found in the publications of Kim et al, 2018 andWang et al, 2020 [23,33].…”

Section: Methodsmentioning

confidence: 99%

A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube

et al. 2020

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In this study, cement composites were fabricated with various contents of added nano-silica (NS) and multi-walled carbon nanotubes (MWNTs). The compressive and flexural strengths of the resultant cement composites were examined. To explore the microstructures and MWNT distribution, electrical conductivity tests, and scanning electron microscopy were conducted. In addition, the strength results were analyzed based on thermal analysis and porosity evaluations. The electrical conductivity results indicated that MWNTs were satisfactorily distributed in the cement composites. In the mechanical strength tests, the composite with a 0.6% MWNT and 5% NS content and another with a 0.3% MWNT and 5% NS content yielded enhancements in the compressive and flexural strengths of 17.2% and 52% compared with the control samples, respectively. However, composites containing relatively large amounts of both NS and MWNTs showed degradation in the mechanical strength. The enhancement or degradation of the strength was supported by porosity evaluations and thermal analysis results. In particular, the degradation of the strength due to the incorporation of large amounts of both MWNTs and NS was explained by thermogravimetric analysis, which indicated a limited generation of calcium silicate hydrate (C-S-H) hydration products. The lower generation of C-S-H was likely due to the dense microstructure of MWNT/NS-incorporated cement hindering the reactions between calcium hydroxide and the NS.

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“…"Mechanical, Electrical, and Piezoresistive Sensing Characteristics of Epoxy-Based Composites Incorporating Hybridized Networks of Carbon Nanotubes, Graphene, Carbon Nanofibers, or Graphite Nanoplatelets" [6] compares the mechanical, electrical, morphological and piezoresistive characteristics of epoxy-based sensing nanocomposites fabricated with inclusions of hybridized networks of four different carbon nanomaterials: carbon nanotubes, graphene, carbon nanofibers and graphite nanoplatelets.…”

Section: Contributionsmentioning

confidence: 99%

Applications of Graphene-Based Materials in Sensors

Hernáez

2020

Sensors

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This Special Issue compiles a set of innovative developments on the use of graphene-based materials in the fabrication of sensors. In particular, these contributions report original studies on a wide variety of sensors, such as gas sensors for NO2 or NH3 detection, antibody biosensors or mass sensors. All these devices have one point in common: they have been built using graphene-based materials like graphene, graphene oxide, reduced graphene oxide, inkject printing graphene, graphene-based composite sponges, graphene screen-printed electrodes or graphene quantum dots.

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Mechanical, Electrical, and Piezoresistive Sensing Characteristics of Epoxy-Based Composites Incorporating Hybridized Networks of Carbon Nanotubes, Graphene, Carbon Nanofibers, or Graphite Nanoplatelets

Cited by 24 publications

References 37 publications

Smart Graphite–Cement Composite for Roadway-Integrated Weigh-In-Motion Sensing

Smart Graphite–Cement Composite for Roadway-Integrated Weigh-In-Motion Sensing

A Study on Mechanical Characteristics of Cement Composites Fabricated with Nano-Silica and Carbon Nanotube

Applications of Graphene-Based Materials in Sensors

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