Journal
NANOTECHNOLOGY
Volume 29, Issue 35, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aacc59
Keywords
ultrathin strain sensor; high stretchability; carbon nanotube nanopaper; poly(dimethyl siloxane) (PDMS); ultrasonication
Funding
- Ohio Third Frontier IPP Program
- National Natural Science Foundation of China [51673020, 51173015]
- Chinese Scholarship Council
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Multifunctional electronics are attracting great interest with the increasing demand and fast development of wearable electronic devices. Here, we describe an epidermal strain sensor based on an all-carbon conductive network made from multi-walled carbon nanotubes (MWCNTs) impregnated with poly(dimethyl siloxane) (PDMS) matrix through a vacuum filtration process. An ultrasonication treatment was performed to complete the penetration of PDMS resin in seconds. The entangled and overlapped MWCNT network largely enhances the electrical conductivity (1430 S m(-1)), uniformity (remaining stable on different layers), reliable sensing range (up to 80% strain), and cyclic stability of the strain sensor. The homogeneous dispersion of MWCNTs within the PDMS matrix leads to a strong interaction between the two phases and greatly improves the mechanical stability (ca. 160% strain at fracture). The flexible, reversible and ultrathin (< 100 mu m) film can be directly attached on human skin as epidermal strain sensors for high accuracy and real-time human motion detection.
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