High-performance textile piezoelectric pressure sensor with novel structural hierarchy based on ZnO nanorods array for wearable application

With the increasing demand for smart wearable clothing, the textile piezoelectric pressure sensor (T-PEPS) that can harvest mechanical energy directly has attracted significant attention. However, the current challenge of T-PEPS lies in remaining the outstanding output performance without compromising its wearing comfort. Here, a novel structural hierarchy T-PEPS based on the single-crystalline ZnO nanorods are designed. The T-PEPS is constructed with three layers mode consisting of a polyvinylidene fluoride (PVDF) membrane, the top and bottom layers of conductive rGO polyester (PET) fabrics with self-orientation ZnO nanorods. As a result, the as-fabricated T-PEPS shows low detection limit up to 8.71 Pa, high output voltage to 11.47 V and superior mechanical stability. The sensitivity of the sensor is 0.62 V·kPa−1 in the pressure range of 0–2.25 kPa. Meanwhile, the T-PEPS is employed to detect human movements such as bending/relaxation motion of the wrist, bending/stretching motion of each finger. It is demonstrated that the T-PEPS can be up-scaled to promote the application of wearable sensor platforms and self-powered devices.

Superhydrophobic MXene‑Based Fabric with Electromagnetic Interference Shielding and Thermal Management Ability for Flexible Sensors

Smart fabrics have made remarkable progress in the field of wearable electronics because of their unique structure,flexibility and breathability,which are highly desirable with integrated multifunctionality.Here,a superhydrophobic smart fabric has been fabricated by decorating conductive MXene on nylon fabric modified by polydopamine(PDA),followed by spraying hydrophobic materials(SiO_(2) and FOTS).The hydrophobic layer not only provides the fabric with superhydrophobicity,but also protects MXene from oxidation.Highly conductive MXene-wrapped fibers endow the fabric with adjustable conductivity and many satisfactory functions.Commendably,the smart fabric possesses sensing performances of ultralow detection limit(0.2%strain),fast response time(60 ms),short recovery time(90 ms),and outstanding sensing stability(5000 cycles).These sensing performances allow the smart fabric to accurately detect body respiratory signals in the running state,exercise state and sleep state,thus keeping track of respiratory health information.Moreover,the smart fabric also exhibits outstanding EMI shielding effectiveness(66.5 dB)in the X-band,satisfactory photothermal performance(68.6℃at 100 mW/cm2),and excellent electrothermal conversion capability(up to 102.3℃at 8 V).Therefore,the smart fabric is extremely promising for applications in EMI shielding,thermal management,and respiratory monitoring,and is an ideal candidate for smart clothing and as a medical diagnostic tool.

High Solar Energy Absorption and Human Body Radiation Reflection Janus Textile for Personal Thermal Management

A large of energy consumption is required for indoor and outdoor personal heating to ameliorate the comfortable and healthy conditions.Main personal thermal management strategy is to reflect mid-infrared human body radiation for human surface temperature(THS)regulation.We demonstrate a visible Janus light absorbent/reflective air-layer fabric(Janus A/R fabric)that can passively reflect radiative heating meanwhile can actively capture the solar energy.A series of azobenzene derivatives functionalized with alkyl tails are reported to co-harvest the solar and phase-change energy.The THS covered by Janus A/R fabric can be heated up to~3.7°C higher than that covered by air-layer fabric in cold environment(5°C).Besides,integrating the thermo-and photo-chromic properties is capable of monitoring comfort THS and residue energy storage enthalpy,respectively.According to the colour monitors,intermittent irradiation approach is proposed to prolong comfortable-THS holding time for managing energy efficiently.