Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 126, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2019.105614
Keywords
Composites; Thermoplastic polyurethane; Capacitive sensors; Carbon nanofillers
Funding
- Parker Hannifin Corporation
- National Science Foundation Partnerships,for International Research and Education (FIRE) Program [1243313]
- Ohio Third Frontier grant [TECH 09-021]
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Flexible pressure sensing applications such as prosthetic limbs and wearable electronics will benefit from pressure sensors with increased capacitive sensitivity. Therefore, to fabricate pressure sensors with increased sensitivity, hybrid composites of a new type of carbon nanofiller, carbon nanostructures (CNS, i.e. branched carbon nanotubes) and graphene nanoplatelets (GNP) at various compositions were mixed with thermoplastic polyurethane (TPU) to tune the composite dielectric properties. Furthermore, in congruence with the global effort towards less wasteful electronic device production, these capacitive sensors were fabricated in a facile and environment-friendly strategy. In a composition of CNS and GNP at a mass ratio of 3:1, the composite sensor shows the highest pressure sensitivity of 2.05 MPa-1 for 0-1.2 MPa pressure, compared with 0.18 MPa-1 for neat TPU, enabling potential wearable pressure sensor applications. The improved performance arises from the combination of interconnected CNS along with the high dielectric constant and suppressed loss of GNP.
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