Effect of contact material and ambient humidity on the performance of MWCNT/PDMS multimodal deformation sensors

Leemets, Kaur; Mäeorg, Uno; Aabloo, Alvo; Tamm, Tarmo

doi:10.1016/j.sna.2018.09.042

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…Depending on the application, the device could be used as a temperature sensor itself or the cross-sensitivity during strain-sensing should be quantified. It is known that moisture can affect CNT/PDMS-based sensors [23]. For now, we disregard the influence of humidity on the sensoric properties.…”

Section: Temperature Sensitivitymentioning

confidence: 99%

Fully Inkjet-Printed Carbon Nanotube-PDMS-Based Strain Sensor: Temperature Response, Compressive and Tensile Bending Properties, and Fatigue Investigations

et al. 2021

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Printed and flexible sensors are in the focus of recent efforts to establish the advantages of low-cost manufacturing techniques such as screen printing or inkjet printing for printed electronical applications. Devices based on conductive carbon nanotube (CNT) networks within polymeric matrices such as polydimethylsiloxane (PDMS) are already exceeding mere technological demonstrations. Therefore, we investigate the application-oriented behaviour of fully inkjet-printed CNT/PDMS strain sensors under different conditions such as short-and long-term performance. The sensors exhibit a quasi-linear piezoresistive behaviour with vanishing hysteresis to tensile strain. Significant differences in the resistive response between compressive and tensile strain suggest complex re-orientation mechanisms of CNTs inside the matrix. No clear indication for this phenomenon could be observed in the evolution of the CNT network resistance during fatigue measurements within an uncured or cured PDMS matrix, where both scenarios exhibit no visual degradation. However, these measurements over thousands of cycles show different permanent changes in the overall device resistance exhibiting damages but also recovery in the network. Considering these findings facilitates the development of printed sensor devices.

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Section: Temperature Sensitivitymentioning

confidence: 99%

Fully Inkjet-Printed Carbon Nanotube-PDMS-Based Strain Sensor: Temperature Response, Compressive and Tensile Bending Properties, and Fatigue Investigations

et al. 2021

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“…The above results indicate that the MWCNT sensor located in the middle thickness could effectively monitor the shear damage of the composite laminates. The resistance change is because of the shear deformation that severs the electrical paths, and the contact resistance is substituted by the tunnel resistance between the different MWCNTs in the sensor [30,37]. As can be seen in the flexural test in Figure 7b, the relative resistance of the MWCNT sensor in the bottom layer of the laminates could sense the flexural load–displacement well, and it shows a sharp increase when the specimen is completely damaged under the flexural load.…”

Section: Sensing Ability Of Mwcnt Sensor In Various Load Conditionsmentioning

confidence: 99%

“…MWCNTs can provide electrical percolation at a very low concentration, because of their high aspect ratio and highly conductive properties [35]. These outstanding properties make MWCNT a promising candidate for nanoelectronic sensors [36,37]. The present study therefore proposes a new resistance-based MWCNT sensor that can in-situ measure the damages in the composite skin of the composite pressure vessel.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Monitoring of a Filament Wound Pressure Vessel by the MWCNT Sensor under Hydraulic Fatigue Cycling and Pressurization

Xiao

Yang

Xuan

et al. 2019

Sensors

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As a result of the high specific strength/stiffness to mass ratio, filament wound composite pressure vessels are extensively used to contain gas or fluid under pressure. The ability to in-situ monitor the composite pressure vessels for possible damage is important for high-pressure medium storage industries. This paper describes an in-situ monitoring method to permanently monitor composite pressure vessels for their structural integrity. The sensor is made of a multi-walled carbon nanotube (MWCNT) that can be embedded in the composite skin of the pressure vessels. The sensing ability of the sensor is firstly evaluated in various mechanical tests, and in-situ monitoring experiments of a full-scale composite pressure vessel during hydraulic fatigue cycling and pressurization are performed. The monitoring results of the MWCNT sensor are compared with the strains measured by the strain gauges. The results show that the measured signal by the developed sensor matches the mechanical behavior of the composite laminates under various load conditions. In the hydraulic fatigue test, the relationship between the resistance and the strain is built, and could be used to quantitative monitor the filament wound pressure vessel. The bursting of the pressure vessel can be detected by the sharp increase of the MWCNT sensor resistance. Embedding the MWCNT sensor into the composite pressure vessel is successfully demonstrated as a promising method for structural health monitoring.

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“…To date, these elastomers are made conductive by the addition of different conducting materials containing carbon, gold, or silver nanoparticles (NPs) , carbon nanotubes (CNTs) , and graphene, which endow conducting composites with PDMS. Because of good electrical conductivity (EC) and excellent mechanical and thermal properties, these composites have been widely investigated in diverse applications .…”

Section: Introductionmentioning

confidence: 99%

“…Because of good electrical conductivity (EC) and excellent mechanical and thermal properties, these composites have been widely investigated in diverse applications . Leemets et al used Ag–PDMS and CNT–PDMS composites to produce conductive microstructures for soft electronic packaging . The self‐heating behavior of Ag–PDMS conductive composites was employed in microheaters in open channels and temperature sensors in thermal applications .…”

Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane)/Cu/Ag nanocomposites: Electrical, thermal, and mechanical properties

2019

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Multifunctional materials are urgently required for sensing and actuation purposes in microfluidic devices. In this study, poly(dimethylsiloxane) (PDMS) filled with Cu and Ag nanoparticles was prepared and its electrical conductivity (EC), thermal conductivity (TC), and mechanical properties were investigated. EC investigations showed that all the prepared compositions had a nearly similar percolation threshold of around 10 vol% of filler. However, the EC of nanocomposites filled with both Cu and Ag (PDMS/Cu/Ag) was about 1.8 S/cm, which was 200% higher compared with that of other compositions (0.3 and 0.6 S/cm). TC was found to undergo profound increase of 10.5-fold (1.68 W.m −1 .K −1 for PDMS/Cu/Ag) when compared with that of the insulating base polymer (0.16 W.m −1 .K −1 ). Evaluation of mechanical properties demonstrated that Young's modulus of PDMS increased by 270% after adding the filler content, but the tensile strength showed a notable reduction of 12%. The final result of this study showed that PDMS/Cu/Ag nanocomposites could be considered as a suitable novel material in microchannel preparation and microfluidic devices. POLYM. COMPOS., 40:4093-4101, 2019.

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Effect of contact material and ambient humidity on the performance of MWCNT/PDMS multimodal deformation sensors

Cited by 8 publications

References 20 publications

Fully Inkjet-Printed Carbon Nanotube-PDMS-Based Strain Sensor: Temperature Response, Compressive and Tensile Bending Properties, and Fatigue Investigations

Fully Inkjet-Printed Carbon Nanotube-PDMS-Based Strain Sensor: Temperature Response, Compressive and Tensile Bending Properties, and Fatigue Investigations

In-Situ Monitoring of a Filament Wound Pressure Vessel by the MWCNT Sensor under Hydraulic Fatigue Cycling and Pressurization

Poly(dimethylsiloxane)/Cu/Ag nanocomposites: Electrical, thermal, and mechanical properties

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