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Flexible and Ultrasensitive Piezoelectric Composites Based on Highly (00l)‐Assembled BaTiO 3 Microplatelets for Wearable Electronics Application
Author(s) -
Li Xiongjie,
Wang Yiping,
Sun Sheng,
He Tingrui,
Hu Querui,
Yang Ying,
Yuan Guoliang
Publication year - 2019
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201900689
Subject(s) - materials science , piezoelectricity , composite number , flexible electronics , electronics , crystal (programming language) , layer (electronics) , wearable computer , composite material , wearable technology , nanotechnology , optoelectronics , electrical engineering , computer science , engineering , embedded system , programming language
Piezoelectric wearable electronics with flexibility and high sensitivity have received increasing attention in the fields of health monitoring, flexible robots, and artificial intelligence. Here, a flexible organic–inorganic hybrid composite for wearable electronics application based on (00l)‐aligned BaTiO 3 (BT) single‐crystal microplatelets is prepared by layer‐by‐layer self‐assembly technology. For the polyvinylidene fluoride‐trifluoroethylene (P(VDF‐TrFE))/BT single‐crystal microplatelets composite film, the sensitivity is nearly 20 times higher than that of its counterparts of P(VDF‐TrFE)/BT microparticles composite film and pure P(VDF‐TrFE) film. The orderly alignment of BT microplatelets also has been found advantageous to the strength of the composite film. The tensile strength is up to 204.3 MPa even at a high inorganic phase content of 53.8 wt% in P(VDF‐TrFE)/BT single‐crystal microplatelets composite film, which is four times that of pure P(VDF‐TrFE) film. Moreover, the flexible piezoelectric wearable device based on P(VDF‐TrFE)/BT single‐crystal microplatelets film effectively provides detailed information for monitoring human activities such as pronunciation, frequency, and waveform of pulse beating, and motion states. This high sensitivity, high strength, and flexible piezoelectric composite provides much potential on the applications of wearable equipments and health monitoring devices.