RESUMEN
Flexible and wearable devices with the capabilities of both detecting and generating mechanical stimulations are critical for applications in human-machine interfaces, such as augmented reality (AR) and virtual reality (VR). Herein, a flexible patch based on a sandwiched piezoelectret structure is demonstrated to have a high equivalent piezoelectric coefficient of d33 at 4050 pC/N to selectively perform either the actuating or sensing function. As an actuator, mechanical vibrations with a peak output force of more than 20 mN have been produced, similar to those from the vibration mode of a modern cell phone, and can be easily sensed by human skin. As a sensor, both the pressure detection limit of 1.84 Pa for sensing resolution and excellent stability of less than 1% variations in 6000 cycles have been achieved. The design principle together with the sensing and driving characteristics can be further developed and extended to other soft matters and flexible devices.
Asunto(s)
Técnicas Biosensibles/métodos , Electricidad , Fenómenos Fisiológicos de la Piel , Parche Transdérmico , Vibración , Técnicas Biosensibles/instrumentación , Técnicas Biosensibles/normas , Dimetilpolisiloxanos/química , Humanos , Nylons/química , Poliésteres/química , Presión , Sensibilidad y EspecificidadRESUMEN
A paper-based active tactile sensor -array (PATSA) with a dynamic sensitivity of 0.35 V N(-1) is demonstrated. The pixel position of the PATSA can be routed by analyzing the real-time recording voltages in the pressing process. The PATSA performance, which remains functional when removing partial areas, reveals that the device has a potential application to customized electronic skins.
Asunto(s)
Biomimética/instrumentación , Equipos y Suministros Eléctricos , Papel , Tacto , Electricidad , PolipropilenosRESUMEN
Smart garments for monitoring physiological and biomechanical signals of the human body are key sensors for personalized healthcare. However, they typically require bulky battery packs or have to be plugged into an electric plug in order to operate. Thus, a smart shirt that can extract energy from human body motions to run body-worn healthcare sensors is particularly desirable. Here, we demonstrated a metal-free fiber-based generator (FBG) via a simple, cost-effective method by using commodity cotton threads, a polytetrafluoroethylene aqueous suspension, and carbon nanotubes as source materials. The FBGs can convert biomechanical motions/vibration energy into electricity utilizing the electrostatic effect with an average output power density of â¼0.1 µW/cm(2) and have been identified as an effective building element for a power shirt to trigger a wireless body temperature sensor system. Furthermore, the FBG was demonstrated as a self-powered active sensor to quantitatively detect human motion.
Asunto(s)
Electrónica , Monitoreo Ambulatorio/instrumentación , Nanotecnología/métodos , Nanotubos de Carbono/química , Fenómenos Biomecánicos , Temperatura Corporal , Suministros de Energía Eléctrica , Electricidad , Diseño de Equipo , Humanos , Movimiento (Física) , Oscilometría , Politetrafluoroetileno/química , Electricidad Estática , Suspensiones , Textiles , Agua/químicaRESUMEN
A type of strain sensor with high tolerable strain based on a ZnO nanowires/polystyrene nanofibers hybrid structure on a polydimethylsiloxane film is reported. The novel strain sensor can measure and withstand high strain and demonstrates good performance on rapid human-motion measurements. In addition, the device could be driven by solar cells. The results indicate that the device has potential applications as an outdoor sensor system.