Cyclic piezoresistive effect in poly(dimethylsiloxane)/carbon nanofiber composites for large strain Sensing applications

2019 ◽  
Vol 30 (7) ◽  
pp. 1010-1017
Author(s):  
M Lu ◽  
MH Chen ◽  
ZX Bu ◽  
LS Wang ◽  
L Sun
Keyword(s):  
Carbon Nanomaterials ◽  
Carbon Nanofiber ◽  
Large Strain ◽  
Temperature Stability ◽  
Strain Sensors ◽  
Strain Sensing ◽  
One Dimensional ◽  
Sensing Applications ◽  
Different Temperatures ◽  
Carbon Nanofiller

Adding conductive one-dimensional carbon nanomaterials to poly(dimethysiloxane) can form bio-compatible composites with significant electromechanical (piezoresistive) response. This effect can be effectively tuned by controlling the carbon nanofiller size, concentration, and distribution. However, to be applied as strain sensors, the composite material has to meet mechanical, sensitivity, temperature stability, and reliability requirements. Here we report on the study of cyclic electromechanical behaviors of poly(dimethysiloxane)/carbon nanofiber composites under different temperatures. Through mechanical training, reproducible and sensitive piezoresistive response suitable for large strain sensing can be obtained.

scholarly journals A Review: Carbon Nanotube-Based Piezoresistive Strain Sensors

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Waris Obitayo ◽  
Tao Liu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Films ◽  
Strain Sensors ◽  
Voltage Response ◽  
Strain Sensing ◽  
Multiwalled Carbon ◽  
Sensing Applications ◽  
Mechanical Deformations ◽  
Electrical Resistivities

The use of carbon nanotubes for piezoresistive strain sensors has acquired significant attention due to its unique electromechanical properties. In this comprehensive review paper, we discussed some important aspects of carbon nanotubes for strain sensing at both the nanoscale and macroscale. Carbon nanotubes undergo changes in their band structures when subjected to mechanical deformations. This phenomenon makes them applicable for strain sensing applications. This paper signifies the type of carbon nanotubes best suitable for piezoresistive strain sensors. The electrical resistivities of carbon nanotube thin film increase linearly with strain, making it an ideal material for a piezoresistive strain sensor. Carbon nanotube composite films, which are usually fabricated by mixing small amounts of single-walled or multiwalled carbon nanotubes with selected polymers, have shown promising characteristics of piezoresistive strain sensors. Studies also show that carbon nanotubes display a stable and predictable voltage response as a function of temperature.

Cyclic Behavior of Electrical Resistance Type Low Stiffness, Large Strain Sensor by Using Carbon Nanofiber/Flexible Epoxy Composite

2011 ◽  
Vol 462-463 ◽  
pp. 1200-1205 ◽  
Author(s):  
Yoshinobu Shimamura ◽  
Kyohei Kageyama ◽  
Keiichiro Tohgo ◽  
Tomoyuki Fujii
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistance ◽  
Carbon Nanofiber ◽  
Epoxy Composite ◽  
Large Strain ◽  
Conductive Polymer ◽  
Cyclic Behavior ◽  
Resistance Change ◽  
Sensing Applications ◽  
Electrical Resistance Change

Carbon nanofiber (CNF) has good electrical conductivity. Addition of a few percentages of carbon nanofiber to polymer yields electrical conductivity but hardly affects the mechanical properties of polymer. This conductive polymer may be useful for sensing applications such as strain sensors and chem-resist sensors. Many researchers have reported on the electrical conductivity, but the electrical resistance change under strain of the carbon nanofiller composites is not fully investigated. In this study, the electrical resistance change under strain of CNF/flexible-epoxy composites was investigated experimentally. More than 100% of quasi-static strain can be measured by using CNF/flexible-epoxy composite with Young’s modulus of less than 1MPa. Cyclic and unloading behaviors were also measured and discussed. It was found that the cyclic behavior was strongly affected by viscoelasticity and damage.

Textile strain sensors: a review of the fabrication technologies, performance evaluation and applications

2019 ◽  
Vol 6 (2) ◽  
pp. 219-249 ◽  
Author(s):  
Shayan Seyedin ◽  
Peng Zhang ◽  
Maryam Naebe ◽  
Si Qin ◽  
Jun Chen ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Large Strain ◽  
Strain Sensors ◽  
Material Structure ◽  
Strain Sensing ◽  
Sensing Range

Strain sensors that are made of textiles offer wearability and large strain sensing range. Recent exciting developments in material, structure, fabrication, performance, and application of textile strain sensors are evaluated and guidelines are provided to overcome the current challenges.

scholarly journals Graphene as a Piezoresistive Material in Strain Sensing Applications

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 119
Author(s):  
Farid Sayar Irani ◽  
Ali Hosseinpour Shafaghi ◽  
Melih Can Tasdelen ◽  
Tugce Delipinar ◽  
Ceyda Elcin Kaya ◽  
...  
Keyword(s):  
Mechanical Strain ◽  
Evolutionary Process ◽  
Strain Range ◽  
Device Fabrication ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Strain Sensing ◽  
Characterization Methods ◽  
Accuracy Measurement ◽  
Sensing Applications

High accuracy measurement of mechanical strain is critical and broadly practiced in several application areas including structural health monitoring, industrial process control, manufacturing, avionics and the automotive industry, to name a few. Strain sensors, otherwise known as strain gauges, are fueled by various nanomaterials, among which graphene has attracted great interest in recent years, due to its unique electro-mechanical characteristics. Graphene shows not only exceptional physical properties but also has remarkable mechanical properties, such as piezoresistivity, which makes it a perfect candidate for strain sensing applications. In the present review, we provide an in-depth overview of the latest studies focusing on graphene and its strain sensing mechanism along with various applications. We start by providing a description of the fundamental properties, synthesis techniques and characterization methods of graphene, and then build forward to the discussion of numerous types of graphene-based strain sensors with side-by-side tabular comparison in terms of figures-of-merit, including strain range and sensitivity, otherwise referred to as the gauge factor. We demonstrate the material synthesis, device fabrication and integration challenges for researchers to achieve both wide strain range and high sensitivity in graphene-based strain sensors. Last of all, several applications of graphene-based strain sensors for different purposes are described. All in all, the evolutionary process of graphene-based strain sensors in recent years, as well as the upcoming challenges and future directions for emerging studies are highlighted.

Dynamic Response Analysis of Passive Wireless Surface Acoustic Wave (SAW) Strain Sensors Used for Force Measurement in Turning

2013 ◽  
Vol 7 (4) ◽  
pp. 451-460 ◽  
Author(s):  
Rory Stoney ◽  
◽  
Dermot Geraghty ◽  
Garret E. O’Donnell
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
High Performance ◽  
Force Measurement ◽  
Direct Analysis ◽  
Strain Sensors ◽  
Response Analysis ◽  
Bench Mark ◽  
Strain Sensing ◽  
Sensing Applications

Passive wireless surface acoustic wave (SAW) strain sensors offer significant advantages over alternative well known sensing technologies and can enable sensing applications robustly in very harsh environments. The passive wireless operation of SAW sensors is especially relevant given there is a drive for more robust and diverse sensing technologies in more complex and high performance applications. Wireless passive dynamic SAW strain sensing has been realised and has enabled force measurement during CNC turning. This paper demonstrates the SAW performance alongside two state of the art Kistler sensing technologies designed for this application area. Direct analysis and investigation of both static and dynamic signals is important for establishing bench-mark performancemetrics and the operational bandwidth of the SAW system.

scholarly journals Photonic Crystal Polymeric Thin-Film Dye-Lasers for Attachable Strain Sensors

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5331
Author(s):  
Tsan-Wen Lu ◽  
Yu-Kai Feng ◽  
Huan-Yeuh Chu ◽  
Po-Tsung Lee
Keyword(s):  
Thin Film ◽  
Strain Sensors ◽  
Dye Lasers ◽  
Strain Sensing ◽  
One Dimensional ◽  
Scale Thickness ◽  
Polymeric Thin Film ◽  
Wavelength Scale ◽  
Polymeric Dye

In this report, using two-dimensional photonic crystals (PhC) and a one-dimensional PhC nano-beam cavity, we realized the development of all-polymeric dye-lasers on a dye-doped, suspended poly-methylmethacrylate film with a wavelength-scale thickness. In addition to the characterization of basic lasing properties, we also evaluated its capacity to serve as an attachable strain sensor. Through experimentation, we confirmed the stable lasing performances of the dye-laser attaching on a rough surface. Moreover, we also theoretically studied the wavelength responses of the utilized PhC resonators to stretching strain and further improved them via the concept of strain shaping. The attachability and high strain sensing response of the presented thin film PhC dye-lasers demonstrate their potential as attachable strain sensors.

Optimization of nickel nanocomposite for large strain sensing applications

2011 ◽  
Vol 166 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Oliver K. Johnson ◽  
George C. Kaschner ◽  
Thomas A. Mason ◽  
David T. Fullwood ◽  
George Hansen
Keyword(s):  
Large Strain ◽  
Strain Sensing ◽  
Sensing Applications

scholarly journals Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3574
Author(s):  
Pejman Heidarian ◽  
Hossein Yousefi ◽  
Akif Kaynak ◽  
Mariana Paulino ◽  
Saleh Gharaie ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Strain Sensors ◽  
Self Healing ◽  
Nano Materials ◽  
Strain Sensing ◽  
Ferric Ions ◽  
Research Activity ◽  
Adhesion Properties ◽  
High Mechanical Strength ◽  
The Moment

Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

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