Study of piezoresistance effect of carbon nanotube-PDMS composite materials for nanosensors

Lu, Junyong; Lü, Miao; Bermak, Amine; Lee, Yi-Kuen

doi:10.1109/nano.2007.4601407

Cited by 24 publications

(4 citation statements)

References 12 publications

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“…Indeed, Wang et al [40] report a GF value of −2.6 for a CNT/epoxy system at a strain value very close to 0.1 N, while the GF values of our non-porous systems range from −2.1 to −2.8. Similarly, Lu et al [41] studied a CNT/PDMS composite, and in this case, the GF values extrapolated for percentages of nanofiller comparable to those of the system under study are very similar.…”

Section: Electromechanical Characterizationsupporting

confidence: 52%

Optimization of Piezoresistive Response of Elastomeric Porous Structures Based on Carbon-Based Hybrid Fillers Created by Selective Laser Sintering

Rollo,

Ronca,

Cerruti

et al. 2023

Polymers

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Recently, piezoresistive sensors made by 3D printing have gained considerable interest in the field of wearable electronics due to their ultralight nature, high compressibility, robustness, and excellent electromechanical properties. In this work, building on previous results on the Selective Laser Sintering (SLS) of porous systems based on thermoplastic polyurethane (TPU) and graphene (GE)/carbon nanotubes (MWCNT) as carbon conductive fillers, the effect of variables such as thickness, diameter, and porosity of 3D printed disks is thoroughly studied with the aim of optimizing their piezoresistive performance. The resulting system is a disk with a diameter of 13 mm and a thickness of 0.3 mm endowed with optimal reproducibility, sensitivity, and linearity of the electrical signal. Dynamic compressive strength tests conducted on the proposed 3D printed sensors reveal a linear piezoresistive response in the range of 0.1–2 N compressive load. In addition, the optimized system is characterized at a high load frequency (2 Hz), and the stability and sensitivity of the electrical signal are evaluated. Finally, an application test demonstrates the ability of this system to be used as a real-time wearable pressure sensor for applications in prosthetics, consumer products, and personalized health-monitoring systems.

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Section: Electromechanical Characterizationsupporting

confidence: 52%

Optimization of Piezoresistive Response of Elastomeric Porous Structures Based on Carbon-Based Hybrid Fillers Created by Selective Laser Sintering

Rollo,

Ronca,

Cerruti

et al. 2023

Polymers

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“…Despite the development of various conductive composites, with carbon black and graphene as fillers [ 13 , 14 ], composites consisting of a one dimensional (1-D) filler with a high aspect ratio (such as CNT or silver wire) in an insulating polymer matrix have advantages regarding low electrical percolation and an efficient electrical network [ 15 ]. In previous studies, depending on the alignment direction of the CNTs, the physical properties of CNT composites, such as electrical conductivity, mechanical properties and strain-resistance sensitivity, could be changed [ 16 , 17 , 18 , 19 ]. Various attempts to form aligned CNTs have been successfully reported [ 9 , 10 , 20 , 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Filler Alignment on Piezo-Resistive and Mechanical Properties of Carbon Nanotube Composites

et al. 2020

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Highly aligned multi-walled carbon nanotube (MWCNT) polymer composites were fabricated via a roll-to-roll milling process; the alignment of the MWCNTs could be controlled by varying the speed of the rotating rolls. The effect of MWCNT alignment on the polymer matrix was morphologically observed and quantitatively characterized using polarized Raman spectroscopy. To provide a more detailed comparison, MWCNT composites with alignment in the transverse direction and random alignment were fabricated and tested. Enhanced mechanical and electrical properties were obtained for the aligned MWCNT composite, which can be attributed to the efficient electrical network and load transfer, respectively. In addition, a cyclic stretching test was conducted to evaluate the piezo-resistive characteristics of the aligned MWCNT composites. The composites with an aligned filler configuration showed an exceptionally high degree of strain sensitivity compared to the other composites.

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“…For most semiconductors the resistivity change is several orders of magnitude larger than for metals in which the geometrical contribution is dominant. This paper provides an overview of k for different piezoresistive materials, namely metals [4,5], semiconductors [1, 6 -13], conductive composite materials based on PDMS [14,15], and diamond-like carbon [16 -21]. In addition the TCR of the different materials is regarded.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Different Piezoresistive Materials to be Integrated into Micromechanical Force Sensors Based on SU 8 Photoresist

Oerke

König

Büttgenbach

et al. 2014

KEM

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The aim of this scientific work is to present different piezoresistive materials suitable to be integrated into micromechanical force sensors. As material for the mechanical structure of the sensors SU-8 has been chosen because it features favorable characteristics, such as flexible and simple fabrication of micro components through the use of standard UV lithography for forming three dimensional geometries such as cantilevers and membranes. In addition, on the basis of a significantly lower Young’s modulus compared to silicon, great opportunities to improve the force sensitivity of such sensors are offered by SU-8.However, SU-8 photoresist does not have piezoresistive properties, and therefore it has to be combined with an additional, beneficial piezoresistive material. A well-controlled and frequently used material for piezoresistive elements is doped silicon. This paper provides an overview of characteristics such as gauge factor and temperature coefficient of resistance (TCR) for a variety of commonly used piezoresistive materials, namely metals, silicon, conductive composite materials and diamond-like carbon. As a characteristic factor for the estimated sensitivity of the force sensor, the ratio of the gauge factor k to the Young´s modulus E of the structural material is presented for the different material combinations. A classification of conventional silicon based tactile force sensors is made to build a basis for comparison. Furthermore the suitability of different piezoresistive materials for the integration into an SU 8-based sensor is investigated.

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Study of piezoresistance effect of carbon nanotube-PDMS composite materials for nanosensors

Cited by 24 publications

References 12 publications

Optimization of Piezoresistive Response of Elastomeric Porous Structures Based on Carbon-Based Hybrid Fillers Created by Selective Laser Sintering

Optimization of Piezoresistive Response of Elastomeric Porous Structures Based on Carbon-Based Hybrid Fillers Created by Selective Laser Sintering

Effect of Filler Alignment on Piezo-Resistive and Mechanical Properties of Carbon Nanotube Composites

Investigation of Different Piezoresistive Materials to be Integrated into Micromechanical Force Sensors Based on SU 8 Photoresist

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