Impedance spectroscopy analysis of the tunnelling conduction mechanism in piezoresistive composites

Stassi, Stefano; Sacco, Adriano; Canavese, Giancarlo

doi:10.1088/0022-3727/47/34/345306

Cited by 24 publications

(19 citation statements)

References 26 publications

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“…In this configuration the piezoresistive sensor is extremely sensitive [ 45 ]. Static pressure measurements were performed on the sensing element by applying different loads.…”

Section: Quantum Tunnelling Conduction Mechanismmentioning

confidence: 99%

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Stassi

Cauda

Canavese

et al. 2014

Sensors

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358

238

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The large expansion of the robotic field in the last decades has created a growing interest in the research and development of tactile sensing solutions for robot hand and body integration. Piezoresistive composites are one of the most widely employed materials for this purpose, combining simple and low cost preparation with high flexibility and conformability to surfaces, low power consumption, and the use of simple read-out electronics. This work provides a review on the different type of composite materials, classified according to the conduction mechanism and analyzing the physics behind it. In particular piezoresistors, strain gauges, percolative and quantum tunnelling devices are reviewed here, with a perspective overview on the most used filler types and polymeric matrices. A description of the state-of-the-art of the tactile sensor solutions from the point of view of the architecture, the design and the performance is also reviewed, with a perspective outlook on the main promising applications.

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“…In this configuration the piezoresistive sensor is extremely sensitive [ 45 ]. Static pressure measurements were performed on the sensing element by applying different loads.…”

Section: Quantum Tunnelling Conduction Mechanismmentioning

confidence: 99%

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Stassi

Cauda

Canavese

et al. 2014

Sensors

Self Cite

358

238

View full text Add to dashboard Cite

show abstract

“…Confronted particles are able to accumulate electrical load and to establish an electrical field as shown in Figure 6. The usage of FSRs' based on piezocapacitive effect for several applications has been reported by [13][14][15], and strong evidence of capacitance existence in FSRs has been published in [12] where phase shifting between voltage and current was observed when the FSR was fed with AC power. The combined piezocapacitive effect with quantum tunneling conduction result in the R-C circuit is depicted in Figure 7.…”

Section: Consideration Of the Proposed Approach In The Capacitive Modelmentioning

confidence: 99%

“…Loading and unloading forces were applied to four (04) sensors in order to calculate hysteresis error according to (13). The test bench described in [31] was employed again.…”

Section: Journal Of Sensorsmentioning

confidence: 99%

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A Novel and Inexpensive Approach for Force Sensing Based on FSR Piezocapacitance Aimed at Hysteresis Error Reduction

et al. 2018

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Force-sensing resistors (FSRs) are inexpensive alternatives to load cells. They are suitable for applications where noninvasive devices are needed to measure force, stress, or pressure. However, they have been proved to be hysteresis prone and offer nonrepeatable readings due to their highly voltage-dependent electrical resistance. A piezocapacitive effect has been found as an alternative phenomenon that is able to offer force-dependent readings of capacitance with less hysteresis error. Also, this capacitance is not dependent on voltage, which also improves repeatability in force measurements. Since measuring capacitance is more expensive than resistance, the least costly conditioning circuitry is desired. An inexpensive alternative using an LM555 that oscillates depending on capacitance is here presented. Hysteresis and repeatability errors have been reduced for a widespread-used force-sensing resistor brand.

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“…Since the conductivity of CNTs-based composites depends strongly on their structure, the method of impedance spectroscopy is considered to be a useful tool for the detailed characterization of electrical properties of such materials 6,7 . The most important advantage of the impedance spectroscopy as applied to composite materials is that it enables one to separate the contributions of conduction mechanisms associated with the charge transport within the particles (nanotubes) and between them.…”

Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopy Study of Carbon Nanotube–Glass Microfiber Composites

Волков¹,

Varfolomeev²,

Krasnoselsky³

et al. 2016

Orient. J. Chem

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The method of fabricating composites composed of a glass microfiber matrix and the conductive nanofibers is proposed. The nanofibers incorporating single-walled carbon nanotubes (SWCNTs) and an organic material are spread over the surface of glass microfibers and in some areas between microfibers are coupled together into a branched network. The contributions of intra-CNT and inter-CNT conduction mechanisms in the composites with different contents of SWCNTs are evaluated from the analysis of their impedance spectra. The crossover between two conduction mechanisms is observed at a content of SWCNTs of about 0.1 wt. %.

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Impedance spectroscopy analysis of the tunnelling conduction mechanism in piezoresistive composites

Cited by 24 publications

References 26 publications

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

A Novel and Inexpensive Approach for Force Sensing Based on FSR Piezocapacitance Aimed at Hysteresis Error Reduction

Impedance Spectroscopy Study of Carbon Nanotube–Glass Microfiber Composites

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