Currently, various electronic devices make our life more and more safe, healthy, and comfortable, but at the same time, they produce a large amount of nondegradable and nonrecyclable electronic waste that threatens our environment. In this work, we explore an environmentally friendly and flexible mechanical sensor that is biodegradable and recyclable. The sensor consists of a bacterial cellulose (BC) hydrogel as the matrix and imidazolium perchlorate (ImClO 4 ) molecular ferroelectric as the functional element, the hybrid of which possesses a high sensitivity of 4 mV kPa −1 and a wide operational range from 0.2 to 31.25 kPa, outperforming those of most devices based on conventional functional biomaterials. Moreover, the BC hydrogel can be fully degraded into glucose and oligosaccharides, while ImClO 4 can be recyclable and reused for the same devices, leaving no environmentally hazardous electronic waste.
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.
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