Recently, wearable and breathable
healthcare devices for air filtering
and real-time vital signs monitoring have become urgently needed since
virus and particulate matter (PM) cause serious health issues. Herein,
we present a trap-induced dense monocharged hybrid perfluorinated
electret nanofibrous membrane (HPFM) for highly efficient ultrafine
PM0.3 removal with an efficiency of 99.712% under low pressure
drop (38.1 Pa) and high quality factor of 0.154 Pa–1. Furthermore, a recyclable multifunctional healthcare mask is constructed
by integrating the HPFM-based nanogenerator, which realizes efficient
PM0.3 filtering and wireless real-time human respiration
monitoring simultaneously. More importantly, the performance of this
mask is still relatively stable even at 100%RH humidity and 92 °C
temperature conditions for 48 h, which infers that it can be reused
after disinfection. The strategy of fabricating HPFM provides an approach
to obtain charge-rich stable electret materials, and the design of
multifunctional masks demonstrates their potential application for
future personal protection and health monitoring devices.
Implantable ultrasonic energy harvesters that scavenge wireless mechanic energy from ultrasound own remarkable potential in advanced medical protocols for neuroprosthetics, wireless power, biosensor, etc. The main challenge for this kind of device is to achieve high‐efficiency energy conversion in a weak ultrasonic pressure field. Here, a multilayered piezoelectret with strain enhanced piezoelectricity by introducing a parallel‐connected air hole array in an interdielectric layer sandwiched between a pair of electrets for an efficient ultrasonic energy harvester is presented. This device delivers a remarkable peak output power around 13.13 mW and short‐circuits current around 2.2 mA when implanted into tissues at 5~10 mm under an ultrasonic probe setup at 25 mW cm−2, which is higher than the required power threshold of bioelectronic devices and current threshold of nerve stimulation. Furthermore, the feasibility of supplying power to implantable bioelectronics and working as neuroproteins for peripheral nerve stimulation are both demonstrated. It is anticipated that this highly efficient, easily fabricated, and biocompatible device will potentially enable applications for multifunctional and advanced implantable bioelectronics in the next generation of diagnosis and therapy.
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