A battery-free music-driven humidity sensor for intelligent wearable sensing system in smart diaper. (1st February 2023)

• Record Type: Journal Article
• Authors: Peng, Yifeng; Long, Zhihe; Liang, Shan; Zhong, Tianyan; Chen, Meihua; Xing, Lili; Xue, Xinyu
• Is Part Of: Smart materials and structures. Volume 32:Number 2(2023)
• Publication Date: 2023-02-01
• Subjects: battery-free -- music-driven -- humidity-analyzing -- polytetrafluoroethylene/polyaniline; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/1361-665X/acae4d
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: A potential intelligent multifunctional diaper with the integration of flexible sensors and data processing/transmitting units may have the functions of monitoring the urination of babies, detecting the physiological parameters and transmitting the information to the mobile terminal of their parents. Here, we present a battery-free music-driven humidity sensor for an intelligent wearable sensing system in a smart diaper. The working mechanism is based on the coupling of the triboelectric effect and the humidity-sensing process. Driven by baby-acceptable musical sound, the two layers of the device vibrate (resonance effect), and the triboelectric effect generates an electrical output. The output decreases with the increasing humidity, acting as both a power source and humidity-sensing signal. The sensor can be embedded in a diaper to monitor the urination of the baby, and a wireless transmitter is integrated in the system to upload the information. The present results can promote the development of the next generation of self-powered active sensors and expand the scope of battery-free sensing systems.