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Highly Stretchable and Sensitive Single-Walled Carbon Nanotube-Based Sensor Decorated on a Polyether Ester Urethane
Riyani Tri Yulianti1, Yuyun Irmawati1, Fredina Destyorini1
1Research Center for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek, South Tangerang 15314, Indonesia.
ACS Omega
|December 29, 2021
Summary
We developed a highly stretchable sensor using low-concentration single-walled carbon nanotubes (SWCNTs) on flexible yarn. This sensor offers high sensitivity and a large strain range for advanced wearable electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Flexible electronics require robust strain sensors.
- Single-walled carbon nanotubes (SWCNTs) offer excellent electrical properties but can reduce polymer ductility.
- Developing stretchable sensors with maintained mechanical properties is crucial.
Purpose of the Study:
- To fabricate a highly stretchable piezoresistive sensor using low-concentration SWCNTs on polyether ester urethane (PEEU) yarn.
- To investigate the mechanical and electrical properties of the SWCNT/PEEU nanocomposite.
- To explore the sensor's performance under varying strain and temperature conditions.
Main Methods:
- Fabrication of SWCNT/PEEU nanocomposite yarn via a low hydrothermal process (90 °C).
- Characterization of mechanical properties, including elongation at break.
- Measurement of electrical resistivity and gauge factor under tensile strain.
- Analysis of piezoresistivity changes with temperature variations (25-85 °C).
Main Results:
- Achieved a highly stretchable sensor with only a 16.5% reduction in ductility (667.3% to 557.2% elongation at break).
- Controlled electrical resistivity through hydrothermal cycles.
- Obtained a high gauge factor of 4.84 below 100% strain, increasing to 28.5 at >450% strain.
- Demonstrated temperature sensitivity (25-85 °C) due to the hopping effect.
Conclusions:
- The SWCNT/PEEU nanocomposite yarn exhibits excellent stretchability and strain sensing capabilities.
- The fabrication method is simple and uses a low SWCNT concentration.
- The sensor shows high sensitivity and a large strain sensing range, suitable for wearable applications.
- The temperature-dependent piezoresistivity offers potential for multi-functional sensing.
