Abstract
In recent years, considerable research efforts have been devoted to the development of wearable multi-functional sensing technology to fulfill the requirements of healthcare smart detection, and much progress has been achieved. Due to the appealing characteristics of flexibility, stretchability and long-term stability, the sensors have been used in a wide range of applications, such as respiration monitoring, pulse wave detection, gait pattern analysis, etc. Wearable sensors based on single mechanisms are usually capable of sensing only one physiological or motion signal. In order to measure, record and analyze comprehensive physical conditions, it is indispensable to explore the wearable sensors based on hybrid mechanisms and realize the integration of multiple smart functions. Herein, we have summarized various working mechanisms (resistive, capacitive, triboelectric, piezoelectric, thermo-electric, pyroelectric) and hybrid mechanisms that are incorporated into wearable sensors. More importantly, to make wearable sensors work persistently, it is meaningful to combine flexible power units and wearable sensors and form a self-powered system. This article also emphasizes the utility of self-powered wearable sensors from the perspective of mechanisms, and gives applications. Furthermore, we discuss the emerging materials and structures that are applied to achieve high sensitivity. In the end, we present perspectives on the outlooks of wearable multi-functional sensing technology.
Highlights
The fourth industrial revolution, driven by technologies such as the Internet of Things, big data, robots and artificial intelligence, is sweeping the world with unprecedented momentum
Triboelectric sensors are based on triboelectric nanogenerators (TENG)
The textile piezoelectric pressure sensor (T-PEPS) is constructed with three layers, consisting of a polyvinylidene fluoride (PVDF) membrane, and top and bottom layers made of conductive reduced graphene oxide (rGO) polyester (PET) fabrics with self-orientation ZnO nanorods, which has high sensitivity and wide pressure range
Summary
The fourth industrial revolution, driven by technologies such as the Internet of Things, big data, robots and artificial intelligence, is sweeping the world with unprecedented momentum. Wearable systems for human health have attracted broad attention, and many commercial wearable products detecting human body signals continue to appear, such as the Apple Watch, MI band and so on. These products cannot attach to human skin tightly, so tiny physiological parameters cannot be perceived. Flexible, stretchable and multi-functional wearable systems are urgently needed. This article intends to provide an overview on wearable multi-functional se technology for human healthcare, concentrating on the working principles of resis. This article intends to provide an overview on wearable multi-functional sensing technology for human healthcare, concentrating on the working principles of resistance, capacitance, triboelectricity, piezoelectricity, thermo-electricity, pyroelectricity and hybrid mechanisms. Conclusions and future outlooks in the field of wearable multi-functional sensing technology for human healthcare are discussed in the final section
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