Sandwiched carbon nanotube film as strain sensor

Njuguna, Michael K.; Chen, Yan; Hu, Ning; Bell, John; Yarlagadda, Prasad K.D.V.

doi:10.1016/j.compositesb.2012.04.022

Cited by 63 publications

(25 citation statements)

References 26 publications

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“…Overall, the piezoresistive behavior of our CNT SSPs was fairly good for strain sensing utilization at low strain values, yet better performance can be achieved by further engineering the structure. The piezoresistive response of SSP to applied strain in this work can only be described as quasi-linear, which is the same case in many other research studies [14,21,38,62]. Thus, more work is needed to make truly applicable and useful strain sensors over a large strain range.…”

Section: Effect Of Pre-straining On Sensing Performancementioning

confidence: 81%

“…Njuguna et al claimed in their study that CNTs nanocomposite sensors are very sensitive to environmental temperature due to the thermal behavior of polymer matrix. In that work they observed up to 140% resistivity increase in response to a 70 C° temperature increase [38]. As the thermal expansion coefficient of polymer is much larger than that of CNTs, when temperature increases, the inter-tubes distance in the CNT network is increased, resulting in increase of electrical resistance.…”

Section: Testing Systemmentioning

confidence: 90%

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Aligned carbon nanotube sheet piezoresistive strain sensors

Bogdanovich

Bradford

2015

Smart Mater. Struct.

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LI, ANG. Aligned Carbon Nanotube Sheet Piezoresistive Strain Sensors. (Under the direction of Dr. Philip Bradford). With the application of advanced composites rapidly increasing into the aerospace and transportation industries, real time structural health monitoring (SHM) systems are attracting great attention in the composites research community. Carbon nanotubes (CNTs) have a unique set of properties that may be used for the production of a new generation strain/damage sensing materials. This research is going to introduce a novel CNT ensemble based strain sensor. The CNT sheet strain sensors were made with aligned CNT sheets and fiberglass/epoxy prepregs in a very convenient and efficient way. To evaluate the piezoresistive performance of the sensors, various types of mechanical tests were conducted with real-time electrical data acquisition. Specimens with orthogonal CNTs orientations were tested independently to investigate the influence of CNT orientation on piezoresistive behavior. The working mechanisms during mechanical straining were also discussed accordingly. Generally, the tested sensors were found to exhibit fairly good sensing stability, linearity, sensitivity and repeatability at a useful functional strain range, which is favorable for health monitoring of advanced composite material structures. It was also demonstrated that the CNT orientations have great effect on the sensitivity of sensors, leading to other promising applications such as directional strain/stress monitoring. Finally, a pre-straining process was intentionally applied, which enhanced the linearity and long-term dynamic stability of the piezoresistive sensing performance.

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Section: Effect Of Pre-straining On Sensing Performancementioning

confidence: 81%

Section: Testing Systemmentioning

confidence: 90%

Aligned carbon nanotube sheet piezoresistive strain sensors

Bogdanovich

Bradford

2015

Smart Mater. Struct.

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“…Using CNTs to modify polymers provides a practical way to perform strain and fracture sensing. For example, they have been used as strain sensors or damage indicators due to their high strain sensitivity compared to conventional metallic-based strain sensors [4][5][6]. Hu et al [7] studied the strain sensitivity of epoxy-based composite with various types of CNT where the strain gauge factor reaches 20 under a static tensile loading using 1 wt.% of multi-walled carbon nanotube (MWCNT)/epoxy composites.…”

Section: Introductionmentioning

confidence: 99%

Effective electrical conductivity of carbon nanotube-polymer composites: a simplified model and its validation

Jang¹,

Yin²

2015

Mater. Res. Express

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Investigation of uniaxial stretching effects on the electrical conductivity of CNT-polymer nanocomposites C Feng and L Y Jiang-Recent citations Simple fabrication of a multiwall carbon nanotube-elastomer composite with a rough surface and its application in force sensing L.E. Helseth-Electrical impedance spectroscopy of multiwall carbon nanotube-PDMS composites under compression L E Helseth-From blackness to invisibility-carbon nanotubes role in the attenuation of and shielding from radio waves for stealth technology Anna Kolanowska et al

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“…Filler concentration, curing temperature, glass transition temperature and height of barrier values for the host matrix affect the tunneling resistance of the resulting nanocomposites [37]. As it concerns piezoresistive carbon nanotube-based systems, values of the gauge factor have been reported as ranging from 6 to 10 for matrices based on thermoplastic polymers [23,38,39] or epoxy resins characterized by low values of the glass transition temperature (71 • C) [39]. In the present study, a high GF was achieved using a structural epoxy resin characterized by high values in the storage modulus and a glass transition temperature higher than 180 • C (see Figure 2), which are fundamental requirements for its uses as structural material [5].…”

Section: Piezoresistive Characterizationmentioning

confidence: 99%

Damage Monitoring of Structural Resins Loaded with Carbon Fillers: Experimental and Theoretical Study

et al. 2020

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In the present study, nanocomposite materials for structural applications with self-sensing properties are proposed. In particular, suitable processing of epoxy resins filled with carbon nanotubes and expanded graphite characterized by very different aspect ratio leads to nanocomposite systems with high glass transition temperatures and remarkable values of the gauge factor. In particular, this notable property ranges between four, for composites filled with one-dimensional nanofiller, and 39 for composites with two-dimensional (2D) graphite derivatives. The greater sensitivity of the 2D system against permanent deformations is interpreted on the basis of an empirical mathematical model and morphological descriptions. The larger inter-contact area among the graphite layers determines a larger contact resistance change than that occurring among carbon nanotubes. The proposed systems turn out to be very advantageous in strain-sensor applications where damage detection is a key requirement to guarantee the reliability of the structures and the safety of the end-users.

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Sandwiched carbon nanotube film as strain sensor

Cited by 63 publications

References 26 publications

Aligned carbon nanotube sheet piezoresistive strain sensors

Aligned carbon nanotube sheet piezoresistive strain sensors

Effective electrical conductivity of carbon nanotube-polymer composites: a simplified model and its validation

Damage Monitoring of Structural Resins Loaded with Carbon Fillers: Experimental and Theoretical Study

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