Flexible and Stretchable Sensors

2019 ◽  
pp. 189-211
Author(s):  
Tae Hoon Eom ◽  
Jeong In Han
Keyword(s):  
Stretchable Sensors

scholarly journals Effects of 3D Printing-Line Directions for Stretchable Sensor Performances

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1791
Author(s):  
Chi Cuong Vu ◽  
Thanh Tai Nguyen ◽  
Sangun Kim ◽  
Jooyong Kim
Keyword(s):  
3D Printing ◽  
Thermoplastic Polyurethane ◽  
Three Dimensional ◽  
Optimal Solution ◽  
Human Motion ◽  
Repeated Measurements ◽  
Fused Filament Fabrication ◽  
And Performance ◽  
The Times ◽  
Stretchable Sensors

Health monitoring sensors that are attached to clothing are a new trend of the times, especially stretchable sensors for human motion measurements or biological markers. However, price, durability, and performance always are major problems to be addressed and three-dimensional (3D) printing combined with conductive flexible materials (thermoplastic polyurethane) can be an optimal solution. Herein, we evaluate the effects of 3D printing-line directions (45°, 90°, 180°) on the sensor performances. Using fused filament fabrication (FDM) technology, the sensors are created with different print styles for specific purposes. We also discuss some main issues of the stretch sensors from Carbon Nanotube/Thermoplastic Polyurethane (CNT/TPU) and FDM. Our sensor achieves outstanding stability (10,000 cycles) and reliability, which are verified through repeated measurements. Its capability is demonstrated in a real application when detecting finger motion by a sensor-integrated into gloves. This paper is expected to bring contribution to the development of flexible conductive materials—based on 3D printing.

scholarly journals Facile Synthesis of Sprayed CNTs Layer-Embedded Stretchable Sensors with Controllable Sensitivity

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 311 ◽  
Author(s):  
Hammad R. Khalid ◽  
Iqra Choudhry ◽  
Daeik Jang ◽  
Nadir Abbas ◽  
M. Salman Haider ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electronic Devices ◽  
Polymer Layer ◽  
Facile Synthesis ◽  
Optical Images ◽  
Significant Interest ◽  
Potential Applications ◽  
Facile Fabrication ◽  
Stretchable Sensors ◽  
Solution Volume

Flexible electronic devices have gained significant interest due to their different potential applications. Herein, we report highly flexible, stretchable, and sensitive sensors made of sprayed CNT layer, sandwiched between two polymer layers. A facile fabrication process was employed in which the CNT solution was directly sprayed onto a patterned bottom polymer layer, above which a second polymer layer was casted to get a sandwiched composite structure. Varying amounts of CNT solution (i.e., 10, 25, 40, 70, and 100 mL) were sprayed to get conductive CNT layers of different thicknesses/densities. The physical characteristics of the conductive CNT layers were studied through SEM and optical images. The starting electrical resistance values (without strain) as well as the changes in electrical resistance against human body motions were monitored. The synthesized samples exhibited good response against finger and wrist bending. The conductivity of the samples increased with increase of CNT solution volume while the sensitivity followed the inverse relation, suggesting that the sensors with controlled sensitivity could be fabricated for targeted strain ranges using the proposed method.

Multilayer structured AgNW/WPU-MXene fiber strain sensors with ultrahigh sensitivity and a wide operating range for wearable monitoring and healthcare

2019 ◽  
Vol 7 (26) ◽  
pp. 15913-15923 ◽  
Author(s):  
Jun-Hong Pu ◽  
Xing Zhao ◽  
Xiang-Jun Zha ◽  
Lu Bai ◽  
Kai Ke ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Strain Sensors ◽  
Operating Range ◽  
Highly Sensitive ◽  
Ultrahigh Sensitivity ◽  
Stretchable Sensors ◽  
Wide Operating

Integrating slippage and crack propagation points in a new direction towards highly sensitive and stretchable sensors for wearable healthcare.

scholarly journals Multi-functional stretchable sensors based on a 3D-rGO wrinkled microarchitecture

2019 ◽  
Vol 1 (11) ◽  
pp. 4406-4414
Author(s):  
Jin Jia ◽  
Guotao Huang ◽  
Mingti Wang ◽  
Yuhuan Lv ◽  
Xiangyang Chen ◽  
...  
Keyword(s):  
Stretchable Sensors

A 3D-rGO wrinkled film with a graphene expansion structure and stretchable 3D-rGO bulge for application in multi-functional sensors is reported.

scholarly journals 3D Printing Ionogel Auxetic Frameworks for Stretchable Sensors

2019 ◽  
Vol 4 (9) ◽  
pp. 1900452 ◽  
Author(s):  
Jitkanya Wong ◽  
Alex T. Gong ◽  
Peter A. Defnet ◽  
Leire Meabe ◽  
Bruce Beauchamp ◽  
...  
Keyword(s):  
3D Printing ◽  
Stretchable Sensors

INK-JET PRINTED STRETCHABLE SENSORS FOR CELL MONITORING UNDER MECHANICAL STIMULI: A FEASIBILITY STUDY

2019 ◽  
Vol 19 (06) ◽  
pp. 1950049 ◽  
Author(s):  
SARAH TONELLO ◽  
MICHELA BORGHETTI ◽  
NICOLA F. LOPOMO ◽  
MAURO SERPELLONI ◽  
EMILIO SARDINI ◽  
...  
Keyword(s):  
Cyclic Strain ◽  
Mechanical Stimulus ◽  
Research Field ◽  
Stretchable Electronics ◽  
Present System ◽  
Mechanical Stimuli ◽  
Ink Jet ◽  
Cell Monitoring ◽  
Cell Concentrations ◽  
Stretchable Sensors

Impedance-based sensors represent a promising tool for cell monitoring to improve current invasive biological assays. A novel research field is represented by measurements performed in dynamic conditions, monitoring cells (e.g., myocytes) for which the mechanical stimulus plays an important role for promoting maturation. In this picture, we applied printed and stretchable electronics principles, developing a system able to evaluate cells adhesion during substrate cyclic strain. Cytocompatible and stretchable sensors were ink-jet printed using carbon-based ink on crosslinked poly([Formula: see text]-caprolactone) electrospun mats. Moreover, a customized stretching device was produced, with a complete user interface to control testing condition, validated in order to correlate impedance changes with myoblasts — i.e., myocytes precursors — adhesion. Overall system sensitivity was evaluated using three different cell concentrations and DAPI imaging assay was performed to confirm myoblast adhesion. Preliminary results showed the possibility to correlate an average increase of impedance magnitude of 1[Formula: see text]k[Formula: see text] every 15,000 cells/cm2 seeded, suggesting the possibility to discriminate between different cell concentrations, with a sensitivity of 80[Formula: see text]m[Formula: see text]/(cells/cm2). In conclusion, the present system might be generalized in the development of future applications, including the differentiation process of cardiac myocytes with the aid of mechanical stimuli.

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.

Use of the shape memory polymer polystyrene in the creation of thin film stretchable sensors for wearable applications

2016 ◽  
Author(s):  
Kyle R. Van Volkinburg ◽  
Thao Nguyen ◽  
Jonathan D. Pegan ◽  
Michelle Khine ◽  
Gregory N. Washington
Keyword(s):  
Thin Film ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
The Creation ◽  
Stretchable Sensors
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