Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 202, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108600
Keywords
PVDF-TrFE; MXene; Piezoelectric; Electrospinning; Self-powered sensor
Categories
Funding
- National Natural Science Foundation of China (NNSFC) [51873126, 51721091, 51422305]
- Fundamental Research Funds for the Central Universities
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The new PVDF-TrFE/MXene composite film pressure sensor exhibits higher output voltage and better performance than the single PVDF-TrFE film, with improvements closely related to MXene content. This nanomaterial, with unique surface functional groups and high electrical conductivity, shows potential applications in electronic skins and healthcare.
Piezoelectric film pressure sensors are forthcoming choices for self-powered flexible and portable electronics because of their unique advantages in instant response and linear pressure-electrical signal relationship. However, it is commonly of challenge to achieve high output voltage response to pressure in piezoelectric polymer films. Here, we report a piezoelectric film pressure sensor fabricated by electrospun polyvinylidene-fluoride-trifluoroethylene (PVDF-TrFE)/MXene nanofiber mats. As a new two-dimensional nanomaterial, MXene has not only a large amount of surface functional groups to enable interaction with the dipoles of PVDF-TrFE molecular chains, but also high electrical conductivity to potentially increase the polarization of PVDF-TrFE during electrospinning. As such, by comparison with the control pressure sensor consisting of neat PVDF-TrFE film, the composite film sensor shows significantly improved output voltage, and the improvements are closely dependent on MXene content. For instance, the composite film with 2.0 wt% MXene can achieve an instantaneous output power density of similar to 3.64 mW/m(2) under the pressure of 20 N with the frequency of 1 Hz. Such piezoelectric PVDF-TrFE/MXene films are capable of sensing body motion for healthcare. Furthermore, the hydrophilicity of MXene allows the film pressure sensor to monitor humidity change, thus the composite film sensor demonstrates potential application in multifunctional electronic skins.
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