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Shenzhen Advanced Institute has developed a flexible stretchable product with low cost, printability, high conductivity and other functional characteristics.
In a recent breakthrough, the advanced electronic packaging materials research team led by Academician Wang Zhengping and researcher Sun Rong from the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, has successfully developed a low-cost, printable, and highly conductive flexible strain sensor. This innovative material, based on elastic composites with tunable sensitivity, has been applied in real-time monitoring of human motion behavior. The research titled "A Low-Cost, Printable, and Stretchable Strain Sensor Based on Highly Conductive Elastic Composites with Tunable Sensitivity for Human Motion Monitoring" was published online in *Nano Research* (DOI: 10.1007/s12274-017-1811-0, IF=7.354).
Flexible strain sensors are widely considered to have great potential in fields such as e-skin and human motion monitoring systems due to their high stretchability, wide strain range, and good reliability. However, achieving both high stretchability and high sensitivity remains a challenge. High stretchability usually requires structural integrity at large strains, while high sensitivity often relies on small strain changes, leading to conflicting design requirements.
To address this, researchers including Dr. Hu Yougen and Zhu Pengli developed a novel conductive composite using core-shell polymer microspheres coated with silver. Combined with polydimethylsiloxane (PDMS), this material was fabricated using screen printing technology, enabling large-area and cost-effective production of flexible circuits and sensors. The design significantly reduced the use of noble metals while maintaining excellent electrical conductivity. At a silver content of only 36.7 wt%, the sensor achieved a high conductivity of 1.65 × 10ⴠS/m, a wide strain range (>80%), and a high sensitivity ranging from 6.0 to 78.6, along with low resistance overshoot (<15%) and exceptional long-term damp heat stability (1750 hours).
The performance of the sensor can be further fine-tuned by adjusting the amount of hybrid conductive particles. This versatile material has been successfully applied in stretchable electrodes, flexible printed circuits, and human motion monitoring systems, showcasing its strong potential in wearable electronics. The study offers a promising solution for developing affordable, printable, and functional flexible conductive materials.
This research was supported by several key projects, including the National Key R&D Special Project, the National Natural Science Foundation, the Guangdong Provincial Key Laboratory of High-Density Electronic Packaging Materials, and the Outstanding Youth Innovation Fund of the Shenzhen Institute of Advanced Technology.