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Shenzhen Advanced Institute has developed a flexible stretchable product with low cost, printability, high conductivity and other functional characteristics.
Recently, a research team led by Academician Wang Zhengping and researcher Sun Rong from the Advanced Materials Research Center at the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, has made significant progress in the field of flexible electronic packaging materials. They have successfully developed a low-cost, printable, and highly conductive flexible kola material that exhibits excellent stretchability and adaptability. This innovative conductive material was stretched and applied to a flexible strain sensor, enabling real-time monitoring of human motion. The study, 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*, a core journal in the field (DOI: 10.1007/s12274-017-1811-0, IF=7.354).
Flexible strain sensors with high stretchability, wide strain range, and high sensitivity are considered key components in emerging fields like e-skin and human motion monitoring systems. However, achieving both high stretchability and high sensitivity is challenging. High stretchability often requires structural stability under large deformations, while high sensitivity typically demands smaller strain ranges, leading to sudden structural changes. Balancing these properties, along with maintaining high conductivity, remains a major challenge in the field.
The research team, including Dr. Hu Yougen and associate researcher Zhu Pengli, built upon their previous work on the controllability of hybrid conductive particles and the printability of flexible composites. They developed a novel composite using silver-coated core-shell polymer microspheres mixed with polydimethylsiloxane (PDMS). Using screen printing technology, they achieved large-area fabrication of flexible circuits and sensors. This approach significantly reduced the use of noble metals while maintaining high electrical conductivity. The spherical structure of the conductive filler improved the flow properties of the paste and enhanced printability.
At a silver content of just 36.7 wt%, the sensor demonstrated remarkable performance: an electrical conductivity of 1.65 × 10ⴠS/m, a strain range exceeding 80%, a sensitivity ranging from 6.0 to 78.6, and a resistance overshoot of less than 15%. It also showed excellent long-term stability under damp heat conditions for over 1,750 hours. By adjusting the concentration of the hybrid conductive particles, the researchers could further fine-tune the sensor’s conductivity, mechanical properties, and sensing performance.
Thanks to its outstanding characteristics, this conductive elastic composite has been successfully applied in stretchable electrodes, flexible printed circuits, and human motion monitoring systems. These applications highlight its strong potential in the rapidly growing field of flexible wearable electronics. The study provides a valuable technological reference for the development of cost-effective, printable, and functional flexible materials and sensors.
This research was supported by several key programs, including the National Key R&D Special Project, the National Natural Science Foundation, the Key Laboratory of High-Density Electronic Packaging Key Materials in Guangdong Province, and the Outstanding Youth Innovation Fund from the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences.
