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Wearable healthcare devices with monitoring, treating and protecting applications can provide reliable and newfangled interactive service for people. Herein, a bi-functional smart face mask based on electrospun polyetherimide (PEI) electret nonwoven is developed. By virtue of the surplus charges maintained steadily in the PEI nonwoven, the smart face mask possesses bi-functions of removing the particulate matter and generating electricity. Moreover, the unique applications for dynamically monitoring the particulate matter removal ability and human's respiratory rates are demonstrated. Besides offering an unique air filter, this study will promisingly promote the progress of self-powered wearable electronics. [ABSTRACT FROM AUTHOR]

The rapid development of electrical skin and wearable electronics raises the requirement of stretchable strain sensors. In this study, an active fiber-based strain sensor (AFSS) is fabricated by coiling a fiber-based generator around a stretchable silicone fiber. The AFSS shows the sensitive and stable performance and has the ability to detect the strain up to 25%, which is also demonstrated to detect finger motion states. It may play an essential role in future self-powered sensor system. [ABSTRACT FROM AUTHOR]

On page 1798, J. Zhou and colleagues present two kinds of pretreated cotton threads that are entangled to form an double helixes‐structure generator. The generator is then coiled around a silicone fiber to form an active fiber‐based strain sensor which shows sensitive and stable performance and has the ability to detect human body motions. This indicates potential applications in future self‐powered healthy monitor systems by detecting the mechanical deformation of the human body and surrounding environment. [ABSTRACT FROM AUTHOR]