Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 6, Pages 7580-7591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20852
Keywords
sponge-constrained network assembly; spongy conductor; elasticity; wearable piezoresistive sensor; flame-retardant property
Funding
- National Natural Science Foundation of China [51773035]
- Ministry of Education of the People's Republic of China [6141A02033233]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
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The lightweight, superelastic, and fatigue-resistant spongy conductor shows high conductivity under large strains, excellent stability in extreme high temperatures, and sufficient flame-retardant performance. This material has great potential in human motion detection in harsh high-temperature environments.
The construction of wearable piezoresistive sensors with high elasticity, large gauge factor, and excellent durability in a harsh high-temperature environment is highly desired yet challenging. Here, a lightweight, superelastic, and fatigue-resistant spongy conductor was fabricated via a sponge-constrained network assembly, during which highly conductive graphene and flame-retardant montmorillonite were alternatively deposited on a three-dimensional melamine scaffold. The as-obtained spongy conductor exhibited a highly deformation-tolerant conductivity up to 80% strain and excellent fatigue resistance of 10,000 compressive cycles at 70% strain. As a result, the spongy conductor can readily work as a piezoresistive sensor and exhibited a high gauge factor value of similar to 2.3 in a strain range of 60-80% and excellent durability under 60% strain for 10,000 cycles without sacrificing its piezoresistive performance. Additionally, the piezoresistive sensor showed great thermal stability up to 250 degrees C for more than 7 days and sufficient flame-retardant performance for at least 20 s. This lightweight, superelastic, and flame-retardant spongy conductor reveals tremendous potential in human motion detection against a harsh high-temperature environment.
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