Piezoresistive effect in carbon nanotube films

Li, Yong; Wang, Wanlu; Liao, Kejun; Hu, Chenguo; Zhi, Huang; Feng, Qing

doi:10.1360/03tb9024

Cited by 27 publications

(13 citation statements)

References 13 publications

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“…The longitudinal component of the tensor of the specific non-phonon conductance of CNTs is calculated within the framework of the Kubo-Greenwood theory [6] with the Green's function formalism [11] application and the use of the tight-binding Hamiltonian model. The final expression for the longitudinal conductivity of CNTs used in the calculations of the constant M has the following form [9]:…”

Section: Elastoconductivity Of Chiral Cntsmentioning

confidence: 99%

Piezoconductivity of Сhiral Сarbon Nanotubes in the Framework of the Tight-Binding Method

Sergeevna¹,

Gennadyevich²,

Aleksandrovna³

2018

MPCS

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Abstract. The results of a theoretical study of the piezoresistive properties of chiral carbon nanotubes with different types of conductivity are presented in this paper. An analytical expression for an electron spectrum of the chiral deformed carbon nanotubes has been obtained using the tight-binding method. External mechanical loads lead to band gap changes of the studied nanoparticles, which has an indirect influence on its conductivity. This change of conductivity due to a deformation is called piezoresistance effect, which is characterized by piezoresistive constants. In the framework of the Hubbard model and the Green function method, an analytic calculation of such constants, the longitudinal component of the elastoconductivity tensor, has been carried out. Its dependence on nanotubes' diameter, the magnitude of relative deformation of longitudinal compression and stretching are investigated.

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Section: Elastoconductivity Of Chiral Cntsmentioning

confidence: 99%

Piezoconductivity of Сhiral Сarbon Nanotubes in the Framework of the Tight-Binding Method

Sergeevna¹,

Gennadyevich²,

Aleksandrovna³

2018

MPCS

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“…Li et al [11] illustrate the piezoresistive effect of pristine carbon nanotube thin films using a three-point bending test as shown in Figure 11. The gauge factor was found to be 65 under normal temperature for strain up to 500 microstrains, but increases with temperature.…”

Section: Carbon Nanotube-based Composites and Thin Films For Strain Smentioning

confidence: 99%

“…The gauge factor of pristine carbon nanotube films increases with temperature as shown in Figure 16. (Error: Figure 16 is from [11]). The high gauge factors were probably due to different qualities of carbon nanotube films, for example pressure-induced changes in the band gap in pristine carbon nanotube films, defects, and measuring conditions [11].…”

Section: Factors Affecting Resistivity Of Carbon Nanotube Thinmentioning

confidence: 99%

A Review: Carbon Nanotube-Based Piezoresistive Strain Sensors

2012

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The use of carbon nanotubes for piezoresistive strain sensors has acquired significant attention due to its unique electromechanical properties. In this comprehensive review paper, we discussed some important aspects of carbon nanotubes for strain sensing at both the nanoscale and macroscale. Carbon nanotubes undergo changes in their band structures when subjected to mechanical deformations. This phenomenon makes them applicable for strain sensing applications. This paper signifies the type of carbon nanotubes best suitable for piezoresistive strain sensors. The electrical resistivities of carbon nanotube thin film increase linearly with strain, making it an ideal material for a piezoresistive strain sensor. Carbon nanotube composite films, which are usually fabricated by mixing small amounts of single-walled or multiwalled carbon nanotubes with selected polymers, have shown promising characteristics of piezoresistive strain sensors. Studies also show that carbon nanotubes display a stable and predictable voltage response as a function of temperature.

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“…Li et al investigated the piezoresistive behavior of thin MWNTs films. The material was characterized by uniaxial load/unload tensile tests [4]. Other factors, such as the sonication time and temperature can influence the electro-mechanical material response.…”

Section: Introductionmentioning

confidence: 99%

Highly Performing Nanocomposite Sensors for Damage Detection

Magnafico

Karimzadeh

Lanzara

2018

The 18th International Conference on Experimental Mechanics

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Due to their superior physical and electro-mechanical properties, Carbon Nanotubes (CNTs) are one of the most promising composite fillers to realize ultralight and flexible strain sensors that can be used, among others, to monitor strain concentrations within a structure when damage occurs. In this study, sensors are made of Multi-walled Carbon Nanotubes (MWNTs) embedded in a Polymide (PI) matrix. Nanocomposites are characterized under no-load conditions to study the electrical properties, and under tensile loading conditions, to evaluate the electromechanical and piezoresistive response. The results highlight a two orders of magnitude decrease in electrical resistivity if compared with previous studies, the capability to instantaneously respond to unpredictable deformations and to easily adapt to three-dimensional shapes. The beauty of the as conceived nanocomposite film, if compared with the commercially available strain gages, is its unprecedented potential expandability to monitor larger areas without the loss of ultra-low local (in scale) detection. Local detection is in fact allowed by nanoscale morphology changes that induce changes in local electrical conduction. The selected polyimide matrix allows the use of the proposed sensor to harsh and high temperature environments while keeping high flexibility and excellent mechanical properties, key parameters for the realization of reliable electromechanical films.

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Piezoresistive effect in carbon nanotube films

Cited by 27 publications

References 13 publications

Piezoconductivity of Сhiral Сarbon Nanotubes in the Framework of the Tight-Binding Method

Piezoconductivity of Сhiral Сarbon Nanotubes in the Framework of the Tight-Binding Method

A Review: Carbon Nanotube-Based Piezoresistive Strain Sensors

Highly Performing Nanocomposite Sensors for Damage Detection

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