scholarly journals Highly Stretchable Capacitive Sensor with Printed Carbon Black Electrodes on Barium Titanate Elastomer Composite

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 42 ◽  
Author(s):  
Eshwar Cholleti ◽  
Jonathan Stringer ◽  
Mahtab Assadian ◽  
Virginie Battmann ◽  
Chris Bowen ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Carbon Black ◽  
Capacitive Sensor ◽  
Soft Robotics ◽  
Wearable Electronics ◽  
Interdigital Capacitor ◽  
Highly Stretchable ◽  
Good Repeatability ◽  
Stretchable Sensors

Wearable electronics and soft robotics are emerging fields utilizing soft and stretchable sensors for a variety of wearable applications. In this paper, the fabrication of a highly stretchable capacitive sensor with a printed carbon black/Ecoflex interdigital capacitor is presented. The highly stretchable capacitive sensor was fabricated on a substrate made from barium titanate–EcoflexTM 00-30 composite, and could withstand stretching up to 100%. The designed highly stretchable capacitive sensor was robust, and showed good repeatability and consistency when stretched and relaxed for over 1000 cycles.

scholarly journals Printing of Soft Stretch Sensor from Carbon Black Composites

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 732
Author(s):  
Yuteng Zhu ◽  
Mahtab Assadian ◽  
Maziar Ramezani ◽  
Kean C. Aw
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Low Cost ◽  
Wearable Sensors ◽  
Nano Particles ◽  
Soft Robotics ◽  
Highly Stretchable ◽  
Resistive Material ◽  
Mechanical Sensors ◽  
Carbon Based

Demand for highly stretchable mechanical sensors for use in the fields of soft robotics and wearable sensors has been constantly rising. Carbon based materials as piezo-resistive material are low-cost and have been widely used. In this paper instead of using the controversial carbon-nanotubes, carbon black nano-particles mixed with Ecoflex® as piezo-resistive nanocomposite are used and measure strain up to 100%. Two fabrication techniques incorporating the printing (namely-“layer-upon-layer” and “embedded”) of the carbon black nanocomposite will be explored and the performances of the sensors made from these techniques will be evaluated.

Highly Stretchable Resistive Strain Sensors Using Multiple Viscous Conductive Materials

2020 ◽  
Author(s):  
Hongyang Shi ◽  
Xinda Qi ◽  
Yunqi Cao ◽  
Nelson Sepúlveda ◽  
Chuan Wang ◽  
...  
Keyword(s):  
Large Strain ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Fabrication Process ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Detection Range ◽  
Conductive Materials ◽  
Highly Stretchable ◽  
Good Repeatability

Abstract This paper proposes a highly stretchable strain sensor using viscous conductive materials as resistive element and introduces a simple and economic fabrication process by encapsulating the conductive materials between two layers of silicone rubbers Ecoflex 00-30. The fabrication process of the strain sensor is presented, and the properties of the viscous conductive materials are studied. Characterization shows that the sensor with conductive gels, toothpastes, carbon paint, and carbon grease can sustain a maximum tensile strain of 200% and retain good repeatability, with a strain gauge factor of 2.0, 1.75, 3.0, and 7.5, respectively. Furthermore, strain sensors with graphite and carbon nanotubes mixed with conductive gels are fabricated to explore how to improve the gauge factor. With a focus on the most promising material, conductive carbon grease, cyclic stretching tests are conducted and show good repeatability at 100% strain for 100 cycles. Lastly, it is demonstrated that the stretchable strain sensor made of carbon grease is capable of measuring finger bending. With its easy and low-cost fabrication process, large strain detection range and good gauge factor, the conductive materials-based strain sensors are promising for future biomedical, wearable electronics and rehabilitation applications.

scholarly journals Highly elastic and flexible multi-layered carbon black/elastomer composite based capacitive sensor arrays for soft robotics

2019 ◽  
Vol 2-4 ◽  
pp. 100004
Author(s):  
Harish Devaraj ◽  
Robert Schober ◽  
Mathieu Picard ◽  
Mei Ying Teo ◽  
Cheng-Yao Lo ◽  
...  
Keyword(s):  
Carbon Black ◽  
Sensor Arrays ◽  
Capacitive Sensor ◽  
Soft Robotics

Highly Stretchable Sheath–Core Yarns for Multifunctional Wearable Electronics

2020 ◽  
Author(s):  
Guangming Cai ◽  
Baowei Hao ◽  
Lei Luo ◽  
Zhongming Deng ◽  
Ruquan Zhang ◽  
...  
Keyword(s):  
Wearable Electronics ◽  
Highly Stretchable

scholarly journals Nano Carbon Black-Based High Performance Wearable Pressure Sensors

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 664 ◽  
Author(s):  
Junsong Hu ◽  
Junsheng Yu ◽  
Ying Li ◽  
Xiaoqing Liao ◽  
Xingwu Yan ◽  
...  
Keyword(s):  
Carbon Black ◽  
Pressure Sensor ◽  
High Performance ◽  
Large Scale ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Wearable Electronics ◽  
Atmospheric Pollutant ◽  
Piezoresistive Pressure Sensor ◽  
Nano Carbon

The reasonable design pattern of flexible pressure sensors with excellent performance and prominent features including high sensitivity and a relatively wide workable linear range has attracted significant attention owing to their potential application in the advanced wearable electronics and artificial intelligence fields. Herein, nano carbon black from kerosene soot, an atmospheric pollutant generated during the insufficient burning of hydrocarbon fuels, was utilized as the conductive material with a bottom interdigitated textile electrode screen printed using silver paste to construct a piezoresistive pressure sensor with prominent performance. Owing to the distinct loose porous structure, the lumpy surface roughness of the fabric electrodes, and the softness of polydimethylsiloxane, the piezoresistive pressure sensor exhibited superior detection performance, including high sensitivity (31.63 kPa−1 within the range of 0–2 kPa), a relatively large feasible range (0–15 kPa), a low detection limit (2.26 pa), and a rapid response time (15 ms). Thus, these sensors act as outstanding candidates for detecting the human physiological signal and large-scale limb movement, showing their broad range of application prospects in the advanced wearable electronics field.

Contributions of Elastomer Behavior to Mechanisms of Carbon Black Dispersion

1984 ◽  
Vol 57 (1) ◽  
pp. 153-167 ◽  
Author(s):  
N. Nakajima ◽  
E. R. Harrell
Keyword(s):  
Carbon Black ◽  
Effective Means ◽  
High Stress ◽  
Flow State ◽  
Breakdown Mechanism ◽  
Roll Mill ◽  
Highly Stretchable ◽  
Internal Mixer ◽  
Region Ii ◽  
Carbon Black Dispersion

Abstract In order to achieve good mixing of elastomer and carbon black, the elastomer domains must be reduced in size, that is, the elastomer must be broken into smaller pieces. If this is the only requirement, Region I of the Tokita-White scheme may be most preferred, because the elastomer easily breaks up at this state. However, it is too stiff for compaction of the compound; that is, the elastomer is too stiff to conform to the complex topology of carbon black. If the compaction is the only requirement. Region IV is most preferred, because the material is in the melt-flow state. In reality, Region II, the rubbery, highly stretchable state gives the best result. It appears that the use of Region II is a compromise. However, there is a more important reason for the preference of Region II, that is, the effectiveness of this region for the breakdown of carbon black agglomerates. The breakdown mechanism involves elastomer as a medium for the transfer of force. The effectiveness of the elastomer medium depends on its ability to stretch with the development and maintenance of a high stress. The former may be characterized by the failure envelop and the latter by the stress relaxation experiments. In roll mill as well as internal mixer processing, the folding of compound and the subsequent stretching of it, e.g., lamination mechanism, are the effective means for carbon black dispersion. It is postulated that the lamination mechanism generates localized high shear fields, which force carbon black agglomerates to rotate in the high modulus medium; this results in peeling of the aggregates from the outer shells of the agglomerates.

Direct-Write Stretchable Sensors Using Single-Walled Carbon Nanotube/Polymer Matrix

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Morteza Vatani ◽  
Yanfeng Lu ◽  
Kye-Shin Lee ◽  
Ho-Chan Kim ◽  
Jae-Won Choi
Keyword(s):  
Large Strain ◽  
Strain Range ◽  
Free Form ◽  
Gauge Factor ◽  
Direct Write ◽  
Wearable Electronics ◽  
Resistance Change ◽  
Single Walled Carbon ◽  
3D Structural Electronics ◽  
Stretchable Sensors

There have been increasing demands and interests in stretchable sensors with the development of flexible or stretchable conductive materials. These sensors can be used for detecting large strain, 3D deformation, and a free-form shape. In this work, a stretchable conductive sensor has been developed using single-walled carbon nanotubes (SWCNTs) and monofunctional acrylate monomers (cyclic trimethylolpropane formal acrylate and acrylate ester). The suggested sensors have been fabricated using a screw-driven microdispensing direct-write (DW) technology. To demonstrate the capabilities of the DW system, effects of dispensing parameters such as the feed rate and material flow rate on created line widths were investigated. Finally, a stretchable conductive sensor was fabricated using proper dispensing parameters, and an experiment for stretchability and resistance change was accomplished. The result showed that the sensor had a large strain range up to 90% with a linear resistance change and gauge factor ∼2.7. Based on the results, it is expected that the suggested DW stretchable sensor can be used in many application areas such as wearable electronics, tactile sensors, 3D structural electronics, etc.

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