Nanotailored Thermoplastic/Carbon Nanotube Composite Strain Sensor

2006 ◽  
Author(s):  
Giang T. Pham ◽  
Alessio Colombo ◽  
Young-Bin Park ◽  
Chuck Zhang ◽  
Ben Wang
Keyword(s):  
Surface Area ◽  
Crack Detection ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Combined Loading ◽  
Sensitivity Factor ◽  
Conductive Network ◽  
Strain Sensing ◽  
Composite Strain ◽  
Commercial Applications

This paper presents the development of polymer-nanofiller systems as strain sensor materials and the development of novel sensor fabrication and characterization techniques. The developed sensor has shown to overcome the limitations of conventional strain sensors — having the capability to measure macroscale strains in any desired direction over a finite surface area, which may be subjected to combined loading modes, including tension, compression, flexure, and shear. They have sufficient flexibility and toughness to accommodate most curved surfaces and corners in components and structures. The methodologies use high aspect ratio multi-walled carbon nanotubes (MWNTs) in order to take advantage of their capability to form efficient conductive network. The results will lead to tailoring of sensor performance, particularly sensitivity factor, by controlling conductive network and optimizing sensor design and fabrication. To date, sensitivity factor of almost 20 at 1 wt.% of MWNTs in poly(methyl methacrylate) (PMMA) has been achieved. The developed sensor can be used in various military and commercial applications, including macroscale strain sensing over a wide surface area (e.g. aircraft skin), high sensitivity strain sensing on stiff components, and crack detection at critical stress concentrated regions for health monitoring.

Highly sensitive, durable and stretchable plastic strain sensors using sandwich structures of PEDOT:PSS and an elastomer

2018 ◽  
Vol 2 (2) ◽  
pp. 355-361 ◽  
Author(s):  
Xi Fan ◽  
Naixiang Wang ◽  
Jinzhao Wang ◽  
Bingang Xu ◽  
Feng Yan
Keyword(s):  
Plastic Strain ◽  
Sandwich Structures ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Strain Sensing ◽  
Highly Sensitive

A stretchable plastic strain sensor was fabricated, showing high sensitivity and a broad strain-sensing region with good durability.

A highly flexible and multifunctional strain sensor based on a network-structured MXene/polyurethane mat with ultra-high sensitivity and a broad sensing range

Nanoscale ◽  
2019 ◽  
Vol 11 (20) ◽  
pp. 9949-9957 ◽  
Author(s):  
Kai Yang ◽  
Fuxing Yin ◽  
Dan Xia ◽  
Huifen Peng ◽  
Jinzheng Yang ◽  
...  
Keyword(s):  
Strain Sensor ◽  
High Sensitivity ◽  
Strain Sensing ◽  
Sensing Range

A highly flexible and stretchable network-structured MXene/polyurethane mat demonstrated ultra-high sensitivity and an ultra-wide sensing range for strain sensing.

Printed Strain Sensor with High Sensitivity and Wide Working Range Using a Novel Brittle–Stretchable Conductive Network

2020 ◽  
Vol 12 (31) ◽  
pp. 35282-35290
Author(s):  
Yi-Fei Wang ◽  
Tomohito Sekine ◽  
Yasunori Takeda ◽  
Jinseo Hong ◽  
Ayako Yoshida ◽  
...  
Keyword(s):  
Strain Sensor ◽  
High Sensitivity ◽  
Conductive Network

Embedded 3D Printing of Highly Flexible Nanocomposites With Piezoresistive Sensing Capabilities

2020 ◽  
Author(s):  
Blake Herren ◽  
Mrinal C. Saha ◽  
M. Cengiz Altan ◽  
Yingtao Liu
Keyword(s):  
3D Printing ◽  
Human Skin ◽  
Strain Sensor ◽  
Strain Range ◽  
High Sensitivity ◽  
Curing Temperature ◽  
Gauge Factor ◽  
Strain Sensing ◽  
Sensing Applications ◽  
Human Joints

Abstract In recent years, highly flexible nanocomposite sensors have been developed for the detection of a variety of human body movements. To precisely detect the bending motions of human joints, the sensors must be able to conform well with the human skin and produce signals that effectively describe the amount of deformation applied to the material during bending. In this paper, a carbon nanotube-based piezoresistive strain sensor is developed via the direct ink writing based embedded 3D printing method. The optimum weight concentration range of carbon nanotubes in the nanocomposite inks, appropriate for embedded 3D printing, is identified. Samples with complex 2D and 3D geometries are printed to demonstrate the manufacturing capabilities of the embedded printing process. The sensitivity of the piezoresistive strain sensor is optimized by determining the ideal nanofiller concentration, curing temperature, and nozzle size to produce the highest gauge factor in a wide strain range. The piezoresistive and mechanical properties of the optimized sensors are fully characterized to verify the suitability for skin-attachable strain sensing applications. The developed sensors have a wide sensing range, high sensitivity, and minimal strain rate dependence. In addition, their low elasticity and high biocompatibility allow them to be comfortably bonded on the human skin.

scholarly journals Significant strain-rate dependence of sensing behavior in TiO2@carbon fibre/PDMS composites for flexible strain sensors

2021 ◽  
Author(s):  
Fan Zhang ◽  
Hailong Hu ◽  
Simin Hu ◽  
Jianling Yue
Keyword(s):  
Carbon Fibre ◽  
Strain Rate ◽  
Flexible Electronics ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Small Strain ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Hydrothermal Route ◽  
Composite Strain

AbstractCarbon fibre (CF) embedded into elastomeric media has been attracting incredible interest as flexible strain sensors in the application of skin electronics owing to their high sensitivity in a very small strain gauge. To further improve the sensitivity of CF/PDMS composite strain sensor, the relatively low temperature prepared TiO2 nanowire via hydrothermal route was employed herein to functionalize CF. The results showed a significant increase in the sensitivity of the TiO2@CF/PDMS composite strain sensors which was reflected by the calculated gauge factor. As the prepared TiO2 nanowire vertically embraced the surroundings of the CF, the introduced TiO2 nanowire contributed to a highly porous structure which played a predominant role in improving the sensitivity of strain sensors. Moreover, the significant strain rate dependent behavior of TiO2@CF/PDMS strain sensor was revealed when performing monotonic tests at varied strain rate. Therefore, introducing TiO2 nanowire on CF offers a new technique for fabricating flexible strain sensors with improved sensitivity for the application of flexible electronics.

scholarly journals Flexible Metal/Polymer Composite Films Embedded with Silver Nanowires as a Stretchable and Conductive Strain Sensor for Human Motion Monitoring

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 372 ◽  
Author(s):  
Jinjin Luan ◽  
Qing Wang ◽  
Xu Zheng ◽  
Yao Li ◽  
Ning Wang
Keyword(s):  
Polymer Composite ◽  
Silver Nanowires ◽  
Composite Films ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Motion ◽  
Applied Strain ◽  
Potential Candidate ◽  
Flexible Metal ◽  
Metal Polymer

To avoid conductive failure due to the cracks of the metal thin film under external loads for the wearable strain sensor, a stretchable metal/polymer composite film embedded with silver nanowires (AgNWs) was examined as a potential candidate. The combination of Ag film and AgNWs enabled the fabrication of a conductive film that was applied as a high sensitivity strain sensor, with gauge factors of 7.1 under the applied strain of 0–10% and 21.1 under the applied strain of 10–30%. Furthermore, the strain sensor was demonstrated to be highly reversible and remained stable after 1000 bending cycles. These results indicated that the AgNWs could act as elastic conductive bridges across cracks in the metal film to maintain high conductivity under tensile and bending loads. As such, the strain sensor engineered herein was successfully applied in the real-time detection and monitoring of large motions of joints and subtle motions of the mouth.

Superhydrophobic gradient wrinkle strain sensor with ultra-high sensitivity and broad strain range for motion monitoring

2021 ◽  
Vol 9 (15) ◽  
pp. 9634-9643
Author(s):  
Zhenming Chu ◽  
Weicheng Jiao ◽  
Yifan Huang ◽  
Yongting Zheng ◽  
Rongguo Wang ◽  
...  
Keyword(s):  
Human Body ◽  
Full Range ◽  
Strain Sensor ◽  
Strain Range ◽  
High Sensitivity

A graphene-based gradient wrinkle strain sensor with a broad range and ultra-high sensitivity was fabricated by a simple pre-stretching method. It can be applied to the detection of full-range human body motions.

scholarly journals Design of a Sensitive Balloon Sensor for Safe Human–Robot Interaction

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 2163
Author(s):  
Dongjin Kim ◽  
Seungyong Han ◽  
Taewi Kim ◽  
Changhwan Kim ◽  
Doohoe Lee ◽  
...  
Keyword(s):  
High Performance ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Human Robot Interaction ◽  
Large Area ◽  
Tactile Sensors ◽  
Robot Interaction ◽  
Mechanical Crack ◽  
Flexible Strain Sensor ◽  
Contact Sensing

As the safety of a human body is the main priority while interacting with robots, the field of tactile sensors has expanded for acquiring tactile information and ensuring safe human–robot interaction (HRI). Existing lightweight and thin tactile sensors exhibit high performance in detecting their surroundings. However, unexpected collisions caused by malfunctions or sudden external collisions can still cause injuries to rigid robots with thin tactile sensors. In this study, we present a sensitive balloon sensor for contact sensing and alleviating physical collisions over a large area of rigid robots. The balloon sensor is a pressure sensor composed of an inflatable body of low-density polyethylene (LDPE), and a highly sensitive and flexible strain sensor laminated onto it. The mechanical crack-based strain sensor with high sensitivity enables the detection of extremely small changes in the strain of the balloon. Adjusting the geometric parameters of the balloon allows for a large and easily customizable sensing area. The weight of the balloon sensor was approximately 2 g. The sensor is employed with a servo motor and detects a finger or a sheet of rolled paper gently touching it, without being damaged.

scholarly journals Piezoresistive Characteristics of Nanocarbon Composite Strain Sensor by Its Longitudinal Pattern Design

2021 ◽  
Vol 11 (13) ◽  
pp. 5760
Author(s):  
Sung-Yong Kim ◽  
Baek-Gyu Choi ◽  
Gwang-Won Oh ◽  
Chan-Jung Kim ◽  
Young-Seok Jung ◽  
...  
Keyword(s):  
Axial Load ◽  
Filler Content ◽  
Factor Model ◽  
Strain Sensor ◽  
Gauge Factor ◽  
Geometric Pattern ◽  
Pattern Design ◽  
Macro Scale ◽  
Composite Strain ◽  
Longitudinal Pattern

For an engineering feasibility study, we studied a simple design to improve NCSS (nanocarbon composite strain sensor) sensitivity by using its geometric pattern at a macro scale. We fabricated bulk- and grid-type sensors with different filler content weights (wt.%) and different sensor lengths and investigated their sensitivity characteristics. We also proposed a unit gauge factor model of NCSS to find a correlation between sensor length and its sensitivity. NCSS sensitivity was improved proportional to its length incremental ratio and we were able to achieve better linear and consistent data from the grid type than the bulk type one. We conclude that the longer sensor length results in a larger change of resistance due to its piezoresistive unit summation and that sensor geometric pattern design is one of the important issues for axial load and deformation measurement.

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