Laser-engraved carbon nanotube paper for instilling high sensitivity, high stretchability, and high linearity in strain sensors

Nanoscale ◽  
2017 ◽  
Vol 9 (30) ◽  
pp. 10897-10905 ◽  
Author(s):  
Yangyang Xin ◽  
Jian Zhou ◽  
Xuezhu Xu ◽  
Gilles Lubineau
Keyword(s):  
Carbon Nanotube ◽  
Crack Density ◽  
High Sensitivity ◽  
Strain Sensors ◽  
High Linearity ◽  
High Crack ◽  
Ultrahigh Sensitivity

Sensors based on carbon nanotube papers with high crack density can attain ultrahigh sensitivity, high stretchability and high linearity.

Ultra-stretchable and highly sensitive strain sensor based on gradient structure carbon nanotubes

Nanoscale ◽  
2018 ◽  
Vol 10 (28) ◽  
pp. 13599-13606 ◽  
Author(s):  
Binghao Liang ◽  
Zhiqiang Lin ◽  
Wenjun Chen ◽  
Zhongfu He ◽  
Jing Zhong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Sensitive Strain ◽  
Gauge Factor ◽  
Gradient Structure ◽  
Highly Sensitive ◽  
Highly Stretchable

A highly stretchable and sensitive strain sensor based on a gradient carbon nanotube was developed. The strain sensors show an unprecedented combination of both high sensitivity (gauge factor = 13.5) and ultra-stretchability (>550%).

A hierarchical carbon nanotube/SiO2 nanoparticle network induced superhydrophobic and conductive coating for wearable strain sensors with superior sensitivity and ultra-low detection limit

2019 ◽  
Vol 7 (14) ◽  
pp. 4199-4209 ◽  
Author(s):  
Jiefeng Gao ◽  
Lisheng Wu ◽  
Zheng Guo ◽  
Jiye Li ◽  
Cong Xu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Detection Limit ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Wearable Electronics ◽  
Conductive Coating ◽  
Low Detection Limit ◽  
Sio2 Nanoparticle ◽  
Hierarchical Carbon

It is desirable to develop strain sensors with large stretchability, high sensitivity, and good anti-corrosive properties, due to their promising applications in wearable electronics.

Development of Carbon-Nanotube-Based Nanocomposite Strain Sensor

2005 ◽  
Author(s):  
Giang T. Pham ◽  
Young-Bin Park ◽  
Ben Wang
Keyword(s):  
Carbon Nanotube ◽  
Network Formation ◽  
Composite Films ◽  
High Sensitivity ◽  
Industrial Applications ◽  
Melt Processing ◽  
Strain Sensors ◽  
Film Sensor ◽  
Loading Mode ◽  
Wide Range

This paper presents the development of carbon-nanotube-based, polymer composite films that can be used as high-sensitivity strain sensors. The films were fabricated via either melt processing or solution casting of thermoplastic polymer matrices containing low concentrations of multi-walled carbon nanotubes. The electrical resistivities of the films were measured in situ using laboratory-designed fixtures and data acquisition system. The measured resistivities were correlated with the applied strains to evaluate the sensitivity of the nanocomposite film sensor. Various types of loading mode, including tension and flexure were considered. The paper suggests that conductive network formation, thus strain sensitivity of the conductive films, can be tailored by controlling nanotube loading, degree of nanotube dispersion, and film fabrication process. The developed sensors exhibited a wide range of sensitivity, the upper limit showing nearly an order of magnitude increase compared to conventional strain gages. Military and industrial applications of the sensitivity-tunable strain sensors are presented.

scholarly journals The Effect of Encapsulation on Crack-Based Wrinkled Thin Film Soft Strain Sensors

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 364
Author(s):  
Thao Nguyen ◽  
Michael Chu ◽  
Robin Tu ◽  
Michelle Khine
Keyword(s):  
Thin Film ◽  
Large Scale ◽  
Crack Formation ◽  
Dynamic Range ◽  
Body Movement ◽  
Crack Density ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Signal Recovery ◽  
Increased Sensitivity

Practical wearable applications of soft strain sensors require sensors capable of not only detecting subtle physiological signals, but also of withstanding large scale deformation from body movement. Encapsulation is one technique to protect sensors from both environmental and mechanical stressors. We introduced an encapsulation layer to crack-based wrinkled metallic thin film soft strain sensors as an avenue to improve sensor stretchability, linear response, and robustness. We demonstrate that encapsulated sensors have increased mechanical robustness and stability, displaying a significantly larger linear dynamic range (~50%) and increased stretchability (260% elongation). Furthermore, we discovered that these sensors have post-fracture signal recovery. They maintained conductivity to the 50% strain with stable signal and demonstrated increased sensitivity. We studied the crack formation behind this phenomenon and found encapsulation to lead to higher crack density as the source for greater stretchability. As crack formation plays an important role in subsequent electrical resistance, understanding the crack evolution in our sensors will help us better address the trade-off between high stretchability and high sensitivity.

scholarly journals Piezoresistive Multi-Walled Carbon Nanotube/Epoxy Strain Sensor with Pattern Design

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3962 ◽  
Author(s):  
Mun-Young Hwang ◽  
Dae-Hyun Han ◽  
Lae-Hyong Kang
Keyword(s):  
Carbon Nanotube ◽  
Strain Gauge ◽  
Low Cost ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Patch Type ◽  
Multi Walled Carbon Nanotube ◽  
Free Vibration Frequency

Carbon nanotube/polymer-based composites have led to studies that enable the realization of low-cost, high-sensitivity piezoresistive strain sensors. This study investigated the characteristics of piezoresistive multi-walled carbon nanotube (MWCNT)/epoxy composite strain sensors subjected to tensile and compressive loads in one direction at relatively small amounts of strain. A patterned sensor was designed to overcome the disadvantage of the load direction sensitivity differences in the existing sensors. The dispersion state of the MWCNTs in the epoxy polymer matrix with the proposed dispersion process was verified by scanning electron microscopy. An MWCNT/epoxy patterned strain sensor and a patch-type strain sensor were directly attached to an acrylic cantilever beam on the opposite side of a commercial metallic strain gauge. The proposed patterned sensor had gauge factors of 2.52 in the tension direction and 2.47 in the compression direction. The measured gauge factor difference for the patterned sensor was less than that for the conventional patch-type sensor. Moreover, the free-vibration frequency response characteristics were compared with those of metal strain gauges to verify the proposed patch-type sensor. The designed drive circuit compensated for the disadvantages due to the high drive voltage, and it was confirmed that the proposed sensor had higher sensitivity than the metallic strain gauge. In addition, the hysteresis of the temperature characteristics of the proposed sensor is presented to show its temperature range. It was verified that the patterned sensor developed through various studies could be applied as a strain sensor for structural health monitoring.

Ultra-high sensitivity of super carbon-nanotube-based mass and strain sensors

2008 ◽  
Vol 19 (16) ◽  
pp. 165502 ◽  
Author(s):  
Ying Li ◽  
XinMing Qiu ◽  
Fan Yang ◽  
Xi-Shu Wang ◽  
Yajun Yin
Keyword(s):  
Carbon Nanotube ◽  
High Sensitivity ◽  
Strain Sensors

Hierarchical Porous Carbon-Nanotube Skeleton for Sensing Film with Ultrahigh Sensitivity, Stretchability, and Mechanical Compliance

2021 ◽  
Author(s):  
Xiao Han ◽  
Hongbo Zhang ◽  
Wei Xiao ◽  
Xiaolong Han ◽  
Aihua He ◽  
...  
Keyword(s):  
Thin Film ◽  
Health Monitoring ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Hierarchical Porous Carbon ◽  
Minimal Invasiveness ◽  
Mechanical Compliance ◽  
Hierarchical Porous ◽  
Ultrahigh Sensitivity ◽  
Potential Use

Thin-film wearable strain sensors attract increasing attention due to their minimal invasiveness onto the human skin and potential use in health monitoring; however, the simultaneous achievement of high sensitivity and...

scholarly journals Giant gauge factor of Van der Waals material based strain sensors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjie Yan ◽  
Huei-Ru Fuh ◽  
Yanhui Lv ◽  
Ke-Qiu Chen ◽  
Tsung-Yin Tsai ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Large Range ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Proof Of Concept ◽  
High Flexibility ◽  
Small Deformations

AbstractThere is an emergent demand for high-flexibility, high-sensitivity and low-power strain gauges capable of sensing small deformations and vibrations in extreme conditions. Enhancing the gauge factor remains one of the greatest challenges for strain sensors. This is typically limited to below 300 and set when the sensor is fabricated. We report a strategy to tune and enhance the gauge factor of strain sensors based on Van der Waals materials by tuning the carrier mobility and concentration through an interplay of piezoelectric and photoelectric effects. For a SnS2 sensor we report a gauge factor up to 3933, and the ability to tune it over a large range, from 23 to 3933. Results from SnS2, GaSe, GeSe, monolayer WSe2, and monolayer MoSe2 sensors suggest that this is a universal phenomenon for Van der Waals semiconductors. We also provide proof of concept demonstrations by detecting vibrations caused by sound and capturing body movements.

scholarly journals An Ultrahigh-Sensitivity Graphene Resonant Gyroscope

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1890
Author(s):  
Yang Lu ◽  
Zhan-She Guo ◽  
Shang-Chun Fan
Keyword(s):  
Angular Velocity ◽  
High Sensitivity ◽  
Velocity Variation ◽  
Beam Length ◽  
Sensing Element ◽  
Finite Element Software ◽  
Resonant Beam ◽  
Frequency Output ◽  
Length Width ◽  
Ultrahigh Sensitivity

In this study, a graphene beam was selected as a sensing element and used to form a graphene resonant gyroscope structure with direct frequency output and ultrahigh sensitivity. The structure of the graphene resonator gyroscope was simulated using the ANSYS finite element software, and the influence of the length, width, and thickness of the graphene resonant beam on the angular velocity sensitivity was studied. The simulation results show that the resonant frequency of the graphene resonant beam decreased with increasing the beam length and thickness, while the width had a negligible effect. The fundamental frequency of the designed graphene resonator gyroscope was more than 20 MHz, and the sensitivity of the angular velocity was able to reach 22,990 Hz/°/h. This work is of great significance for applications in environments that require high sensitivity to extremely weak angular velocity variation.

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