A lead-free stretchable piezoelectric composite for human motion monitoring

So far, many kinds of piezoelectric composite have been developed to prepare flexible motion sensors. However, some lead-based materials are harmful to human body and cannot be used for motion posture detection, despite their excellent performances. In this work, a lead-free stretchable piezoelectric composite is developed by introduce BaTiO3 (BTO) powder into silicone rubber matrix. The peak-to-peak values of the voltage and current can reach up to 38 V and 0.8 mu A under the periodic stretching excitation. It can respond to different strain stimulations. When fixed on the body, it can effectively detect the angle and frequency of limb movement, suitable as human motion sensor. The flexible stretchable composite provides a good solution for wearable piezoelectric devices. (C) 2019 Elsevier B.V. All rights reserved.