scholarly journals Strain-Sensing Properties of Multi-Walled Carbon Nanotube/Polydimethylsiloxane Composites with Different Aspect Ratio and Filler Contents

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2431 ◽  
Author(s):  
Oh-Nyoung Hur ◽  
Ji-Hwan Ha ◽  
Sung-Hoon Park
Keyword(s):  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Strain Sensor ◽  
Strain Sensing ◽  
Sensing Properties ◽  
Sensor Applications ◽  
Aspect Ratios ◽  
Multi Walled Carbon Nanotube ◽  
Milling Method ◽  
Sensor Properties

For filler composite systems used in strain sensor applications, piezoresistive effect, strain hysteresis, and repeatability are critical factors, which have to be clearly evaluated and understood. To investigate the effects of the aspect ratio and content of a multi-walled carbon nanotube (MWCNT) on the strain sensor properties of the composite, MWCNT/Polydimethylsiloxane (PDMS) composites with varying filler contents and aspect ratios were fabricated. In order to uniformly disperse MWCNTs on the polymer matrix, we used a three-roll milling method to generate high shear force for de-bundling MWCNTs. Mechanical and electrical properties of the MWCNT composites were evaluated for each case. In addition, through the cyclic stretching test, we optimized the strain-sensing properties of the MWCNT composites by considering their piezoresistive effects and strain hysteresis.

Embedded carbon nanotube thread piezoresistive strain sensor performance

Sensor Review ◽  
2014 ◽  
Vol 34 (2) ◽  
pp. 209-219 ◽  
Author(s):  
Mark Schulz ◽  
Yi Song ◽  
Adam Hehr ◽  
Vesselin Shanov
Keyword(s):  
Carbon Nanotube ◽  
Composite Materials ◽  
Strain Sensor ◽  
Temperature Stability ◽  
Gauge Factor ◽  
Strain Sensing ◽  
Metallic Structures ◽  
Content Type ◽  
Sensing Properties ◽  
Sensor Performance

Purpose – Carbon nanotube (CNT) thread ' s piezoresisitive strain sensing properties of gauge factor, linearity, hysteresis, consistency, temperature stability, and bandwidth were evaluated. This evaluation was motivated by little information in literature combined with the need to understand these properties for commercial use. The paper aims to discuss these issues. Design/methodology/approach – The study here analyzes as-spun CNT thread built into unidirectional glass fiber composites and mounted onto aluminium beams with epoxy to evaluate strain sensing properties. The analyses utilize known sensor parameter definitions to quantify sensor performance. Findings – CNT thread can provide reliable and robust strain measurements for composite and metallic structures. The strain sensor performance meets or exceeds other strain sensors in performance. Research limitations/implications – CNT thread ' s piezoresistive effect is not well understood in terms of Poisson ' s ratio and nanotube contact. More research needs to be carried out to better understand this relationship and optimize the sensor thread. Practical implications – CNT thread can be utilized as a robust strain sensor for composite and metallic structures. It can also be built into composite materials for embedded strain and damage monitoring. By monitoring composite materials with the sensor thread, reliability will significantly increase. In turn, this will lower safety factors and revolutionize inspection methods for composite materials. Originality/value – This paper is the first to comprehensively evaluate key strain sensing properties of CNT thread. With all this strain sensor information in one spot, this should help expedite the use of this technology in other research and industry.

scholarly journals Bending Properties of Carbon Nanotube/Polymer Composites with Various Aspect Ratios and Filler Contents

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 857
Author(s):  
Oh-Nyoung Hur ◽  
Hyun-Woo Kim ◽  
Sung-Hoon Park
Keyword(s):  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Bending Properties ◽  
Bending Angle ◽  
Piezoresistive Effect ◽  
Bending Tests ◽  
Cyclic Bending ◽  
Aspect Ratios ◽  
Key Characteristics ◽  
Milling Method

The key characteristics of bending sensors are piezoresistive effect, hysteresis, and durability. In this study, to investigate the influence of the aspect ratio and contents of multi-walled nanotubes (MWNTs) on the properties of bending sensors, MWNT/polydimethylsiloxane (PDMS) composites were fabricated with various aspect ratios and filler contents. The MWNTs were uniformly dispersed in the composites using the three-roll milling method. By increasing the bending angle gradually, the sensitivity of each composite was analyzed. Furthermore, discontinuous cyclic bending tests were conducted to investigate the piezoresistive effect and hysteresis. In addition, stable repeatability of the composites was confirmed through continuous cyclic bending tests. As a result, optimal aspect ratios and filler contents have been presented for application in bending sensors of MWNT composites.

Highly stretchable multi-walled carbon nanotube/thermoplastic polyurethane composite fibers for ultrasensitive, wearable strain sensors

Nanoscale ◽  
2019 ◽  
Vol 11 (13) ◽  
pp. 5884-5890 ◽  
Author(s):  
Zuoli He ◽  
Gengheng Zhou ◽  
Joon-Hyung Byun ◽  
Sang-Kwan Lee ◽  
Moon-Kwang Um ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Thermoplastic Polyurethane ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Wet Spinning ◽  
Polyurethane Composite ◽  
Multi Walled Carbon Nanotube ◽  
Highly Sensitive ◽  
Spinning Process ◽  
Highly Stretchable

In this manuscript, we report a novel highly sensitive wearable strain sensor based on a highly stretchable multi-walled carbon nanotube (MWCNT)/Thermoplastic Polyurethane (TPU) fiber obtained via a wet spinning process.

Preparation and enhanced acetone sensing properties of flower-like α-Fe2O3/multi-walled carbon nanotube nanocomposites

2019 ◽  
Vol 300 ◽  
pp. 127012 ◽  
Author(s):  
Xiaohua Jia ◽  
Chuande Cheng ◽  
Shouwen Yu ◽  
Jin Yang ◽  
Yong Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Sensing Properties ◽  
Multi Walled Carbon Nanotube
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