Highly stretchable strain sensors based on AgNWs/PV a nanocomposite hydrogels

Shohreh Azadi, Shuhua Peng, Mohsen Asadnia, Chun H. Wang, Shuying Wu*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)


Here, we report the design, fabrication, and sensing application of highly flexible, conductive hydrogels by embedding conductive silver nanowires (AgNWs) into polyvinyl alcohol (PVA). Two different configurations have been designed including a single layer composite structure and a bilayer structure. The single layer composite was fabricated by direct mixing AgNWs with PVA solution of high concentration (20 wt%). In contrast, a bilayer structure consisted of a bottom PVA layer (20 wt%) and a top layer made of AgNWs and PVA solution of much lower concentration (6 wt%). Both structures exhibited outstanding mechanical properties with high stretchability up to 500% and 600% strain for single layer composite and bilayer structure, respectively. The bilayer hydrogel exhibited a sensitivity (gauge factor) of 0.23 in the strain range of 50 to 250% while the single layer composite structure showed a sensitivity of 0.1 in this range. Overall, the bilayer structure displayed better performance including higher electrical conductivity and piezoresistive sensitivity, larger stretchability, and more stable piezoresistivity. These findings make the PV A-AgNWs/PVA bilayer composite as a potential candidate for strain sensor application.

Original languageEnglish
Title of host publication2019 13th International Conference on Sensing Technology (ICST)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Electronic)9781728148076, 9781728146317
ISBN (Print)9781728148083
Publication statusPublished - 2019
Event13th International Conference on Sensing Technology, ICST 2019 - Sydney, Australia
Duration: 2 Dec 20194 Dec 2019

Publication series

ISSN (Print)2156-8065
ISSN (Electronic)2156-8073


Conference13th International Conference on Sensing Technology, ICST 2019


  • Conductive Hydrogel
  • Flexible Sensor
  • Piezoresistivity
  • Polyvinyl Alcohol
  • Silver Nanowires


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