Piezoresistive performance characterization of strain sensitive multi-walled carbon nanotube-epoxy nanocomposites

Sanli, Abdulkadir; Benchirouf, Abderrahmane; Müller, Christian; Kanoun, Olfa

doi:10.1016/j.sna.2016.12.011

Cited by 112 publications

(51 citation statements)

References 67 publications

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“…The trimming procedure implies setting a fixed R1 and experimentally trimming R2 to satisfy the condition of Equation (14). The opposite procedure (setting R2 and trimming R1) is also possible, but convergence is not ensured given the double dependence on R1 at the ton expression; see Equation (11).…”

Section: Trimming the Offset Resistances For R1 ≠ R2mentioning

confidence: 99%

“…It is the user's decision to choose the most appropriate R 1 based upon the target range of f. The larger R 1 is, the lower the resulting frequency becomes, see Equations (11)- (16). There are multiple combinations of R 1 and R 2 that satisfy Equation (14). The authors have chosen R 1 = 510 Ω as the value to later trim R 2 .…”

Section: Trimming the Offset Resistances For R 1 = Rmentioning

confidence: 99%

“…By taking a glance at the datasheets of commercial FSRs [11][12][13], they exhibit from ten to one hundred times more drift and hysteresis error than load cells. Fortunately, a great effort is currently placed on improving the performance of FSRs by investigating multiple trends such as the integration of carbon nanotubes in the polymer matrix [7,14], changing the electrode configuration of the assembled sensor [15,16], testing different types of polymers [17,18], and adding non-conductive nanoparticles to reinforce the polymer matrix with the aim of reducing creep [9].…”

Section: Introductionmentioning

confidence: 99%

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Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

et al. 2018

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Force Sensing Resistors (FSRs) are manufactured from a blend of conductive nanoparticles dispersed in an insulating polymer matrix. FSRs exhibit large amounts of hysteresis and drift error, but currently, a great effort is placed on improving their performance through different techniques applied during sensor manufacturing. In this article, a novel technique for improving the performance of FSRs is presented; the method can be applied to already-manufactured sensors, which is a clear benefit of the proposed procedure. The method is based on driving the sensors with a modified-astable 555 oscillator, in which the oscillation frequency is set from the sensor's capacitance and resistance. Considering that the sensor's capacitance and resistance have opposite signs in the drift characteristic, the driving circuit provides self-compensated force measurements over extended periods of time. The feasibility of the driving circuit to reduce hysteresis and to avoid sensitivity degradation is also tested. In order to obtain representative results, the experimental measurements from this study were performed over eight FlexiForce A201-25 sensors.

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Section: Trimming the Offset Resistances For R1 ≠ R2mentioning

confidence: 99%

Section: Trimming the Offset Resistances For R 1 = Rmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

et al. 2018

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“…The readout circuit must be often co-designed with the transducer, in order to push the performance limits, by custom-tailoring the electronics to the specific sensor. Impedance spectroscopy is often used to characterize novel materials and devices [2,3], while the final sensor implementation is based on tracking the impedance value over time at a single fixed frequency (or a few discrete tones). This is the case of capacitive sensors [4,5] as well as of AC-coupled conductance measurements, such as impedance cell counting in microfluidic systems [6] or hitless light monitoring in semiconductor waveguides [7].…”

Section: Introductionmentioning

confidence: 99%

Resonant noise-canceling current front-end for high-resolution impedance sensing

Azzellino

Ragni

Carminati

et al. 2018

2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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The ultimate resolution limit of the current frontend of wideband impedance detection circuits is set by the input total capacitance and input equivalent noise. We present a solution to reduce the noise of more than an order of magnitude when the capacitance cannot be further minimized. By introducing a properly-chosen inductor (and a proper and stable biasing network) it is possible to cancel the capacitive reactance at the resonance frequency (~10 MHz) which becomes the sensing frequency, thus significantly reducing the detection noise, while preserving the accuracy of the transfer function. A detailed analysis of the scheme, and its experimental validation with different inductors are presented. In all cases an improvement larger than 10 is achieved with an input-referred current spectral density of ~1 pA/√Hz at the operating frequency of ~20 MHz.

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“…Generally, piezoresistivity is the property of a material to modify its electrical resistivity as a result of the change in the stress or strain state, and is quantified by using the gauge factor, i.e. the relative change in electrical resistance as a function of the applied strain [14][15][16][17][18][19]. This property has inspired researchers to use polymer/CNT composites for monitoring the deformation and damage of structural components [20,21].…”

mentioning

confidence: 99%

On The Strain Sensing of EVA/MWCNT Composite

Rosculet¹,

Stan²,

Fetecău³

2018

Mat.Plast.

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In this paper, the potential of using ethylene-vinyl acetate (EVA) filled with multi-wall carbon nanotubes (MWCNT) composites for strain sensing was investigated. Stress relaxation experiments were conducted on injection-molded samples, and the stress and electrical resistance were measured in situ during the relaxation process. Based on the experimental results, it was found that the electrical resistance of the EVA/MWCNT composite increases with increasing strain, and exponentially decreases with relaxation time, indicating the capacitive behavior of MWCNTs. The maximum electrical conductivity of 7.35�10-4 S/cm was obtained for the EVA/MWCNT composite with 5 wt.% at 180�C, whereas higher piezo-resistive sensitivity was obtained for the composite with 3 wt.%. The electrical percolation threshold was found to increase from 0.223 wt.% at 140�C to 0.994 wt.% at 180�C.

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Piezoresistive performance characterization of strain sensitive multi-walled carbon nanotube-epoxy nanocomposites

Cited by 112 publications

References 67 publications

Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

Self-Compensated Driving Circuit for Reducing Drift and Hysteresis in Force Sensing Resistors

Resonant noise-canceling current front-end for high-resolution impedance sensing

On The Strain Sensing of EVA/MWCNT Composite

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