Quantum tunnelling composites: Characterisation and modelling to promote their applications as sensors

Lantada, Andrés Díaz; Lafont, P.; Sanz, José Luis Muñoz; Muñoz-Guijosa, Juan Manuel; Otero, Javier Echávarri

doi:10.1016/j.sna.2010.09.002

Cited by 33 publications

(35 citation statements)

References 13 publications

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“…S5, which means that the response of the conductive networks to applied stress exists hysteresis in the forward and backward curves. This phenomenon therefore provides evidence that the viscoelastic behavior of silicon rubber matrix has a significant influence on the pressure-sensitivity of the FAQTCs [18,46] . Therefore, the time dependence of pressure-sensitivity of the FAQTCs was accordingly investigated in the next section.…”

Section: Reproducibility Of Pressure-sensitivitymentioning

confidence: 59%

“…By choosing the proper type and amount of matrix and fillers, desirable pressure-sensitivity for various applications can be achieved from finger sensing [16] to vehicle sensing [17] . Among these hybrid systems, field assisted quantum tunneling composites (FAQTCs) have generated a large interest in both the scientific community and industrial research due to their unique electrical properties and ultrahigh pressure-sensitivity [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

“…The combination of high sensitivity and tunable electrical behavior from the insulating to conductive makes FAQTCs the ideal candidate for the design and development of multi-purpose sensors. Some reports of tactile sensing capabilities of the FAQTCs have shown the significant prospect in human robotic applications [18,25,26] . Applications of the FAQTCs as chemical sensors responding to volatile organic compounds have also been reported [23,24] .…”

Section: Introductionmentioning

confidence: 99%

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Pressure-sensitive behaviors, mechanisms and model of field assisted quantum tunneling composites

Ding

Han

Dong

et al. 2017

Polymer

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Field assisted quantum tunneling composite (FAQTC) is a unique pressure-sensitive material with the advantages of large resistance change range under external force, easy preparation and excellent mechanical properties. In this paper, with attentions to the pressure-sensitivity of the FAQTCs, the effects of silicon rubber matrix, diameter and dosage of nickel particles as well as magnetic field treatment are systematically investigated. The reproducibility of the pressure-sensitivity of the FAQTCs under cyclic load is explored. Based on Cotton's equation and Burger's model, the descriptions of stress relaxation behavior and electrical resistance relaxation behavior of the composites under static compressive loading are given respectively. The results show that external magnetic field during curing process allows better adjustment of the pressure-sensitivity of the FAQTCs with fewer nickel particles. The increase of the dosage of nickel particles can improve the stability and reproducibility of the pressure-sensitivity of the composites. Electrical resistance relaxation behavior of the composites is partly controlled by the

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Section: Reproducibility Of Pressure-sensitivitymentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pressure-sensitive behaviors, mechanisms and model of field assisted quantum tunneling composites

Ding

Han

Dong

et al. 2017

Polymer

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“…Moreover, its accuracy depends on the possibility of performing a correct modelling since nonlinearities are present. Thus, research endeavors are aimed at deeply understanding FSRs' behavior and also at complementing their usage with appropriate electronic conditioning circuitry and data processing techniques that could compensate errors and nonlinearities [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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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“…the barrier height and breadth between the nickel particles decrease and the potential energy of charge carriers through tunneling barrier increases when the external constant voltage injected into the both ends of the QTC sensors. As a result, the electrical resistivity of the QTC sensors exponentially decreases when the sensors are deformed [9], [10], [17], [22], [23].…”

Section: Measurementmentioning

confidence: 99%

Design and Implementation of a Multiple Traffic Parameter Detection Sensor Developed With Quantum Tunneling Composites

Han

Ding

et al. 2015

IEEE Sensors J.

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Quantum tunneling composites (QTCs) are extremely sensitive to external force due to the quantum tunnel effect and have been developed into various sensors used in many fields, such as force sensors and tactile sensors. In this paper, a new type of traffic detection sensor is developed based on QTCs which are fabricated by adding spiky spherical nickel powders as functional fillers into silicone rubber. The developed sensors with different sensitivities were incorporated in an experimental road and a real road, and their performances for traffic detection were investigated. Test results show that the QTC sensors with high sensitivity can accurately detect the passing of different vehicles under different vehicular speeds and test environments. The double-rows QTC sensors can measure vehicle speeds easily and precisely. It is possible to measure the vehicle speeds with one QTC sensor per lane. A lot of other traffic data, including vehicle presence, vehicle weigh-in-motion, position, vehicle occupancy rate, vehicle count, and vehicle classification in real-time traffic can be achieved by the QTC sensors with the advantages of high detection precision, fast response and recovery excellent robustness, energy saving, easy installation, and maintenance. The obtained results prove the applicability of the QTC sensors for long-term real-time traffic parameter detection.

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Quantum tunnelling composites: Characterisation and modelling to promote their applications as sensors

Cited by 33 publications

References 13 publications

Pressure-sensitive behaviors, mechanisms and model of field assisted quantum tunneling composites

Pressure-sensitive behaviors, mechanisms and model of field assisted quantum tunneling composites

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

Design and Implementation of a Multiple Traffic Parameter Detection Sensor Developed With Quantum Tunneling Composites

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