•A double-layer–stacked triboelectric textile is proposed.•The high output performance of the triboelectric textile are demonstrated.•The application of triboelectric textile for motion energy harvesting are proved.Developing flexible, lightweight and sustainable power sources is an important route to provide electricity for portable electronics. Here, we demonstrate a high-performance double-layer–stacked triboelectric textile (DTET) for harvesting human motion energy. Both the Ni-coated polyester conductive textile and the silicone rubber were adopted as effective triboelectric materials. A high output open-circuit voltage of 540 V and a short-circuit current of 140 µA can be obtained from the DTET with the size of 5 ×5 cm2, corresponding to a high peak surface power density of 0.892 mW/cm2 at a load resistance of 10 MΩ. The output peak signal of the DTET can be used as a trigger signal of a movement sensor to design movement monitoring equipment. With only the energy harvested from walking, running or flapping, the DTET can directly light up 100 light-emitting diodes (LEDs) connected serially, and drive portable electronics, such as competition timer, digital clock and electronic calculator, which indicate the potential and broad application prospects in biological health monitoring, outdoor exploration, troop marching and portable electronics.Download high-res image (428KB)Download full-size image

The combination of new intelligent materials and structure technology is becoming an effective way in energy havesting and self-powered sensing. In this work, we demonstrate a magnetically levitated/piezoelectric/triboelectric hybrid generator, which does not use complex structure and has high steady output performance. It includes three parts: magnetically levitated generator (MLG), piezoelectric generator (PNG), triboelectric nanogenerator (TENG). The peak power of each is 135 μW, 22 mW and 3.6 mW, which are obtained at 1 MΩ, 10 kΩ and 1 kΩ, respectively. The hybrid generator can completely light up light-emitting diodes (LEDs) under the vibration frequency of 20 Hz and the vibration amplitude of 10 mm. It also can charge a 470 μF capacitor. On this basis, we have integrated the hybrid generaor as a power supply into a self-powered tempreature sensing system. The combination of three generators can not only broaden the operating range, but also increase the operating length and sensitivity. This work will extend the application of self-powered sensor in automatic production line and promote the development of industrial control technology.

•We experimentally demonstrate thermal nonlinear effect in a silicon microring resonator with a 10-μm radius, through vertical coupling, when inject single optical, the measured maximum extinction ratio is up to 17 dB, the slop of resonant wavelength as a function of injected pump is 165 pm/mw. Secondly, switching time measured by two pump injection technology is 3.01 μs and 1.03 μs, respectively.•The results which are in agreement with theory between single and two-pump-injection techbology are compared and analyzed.•Those provide efficient method for optical router and modulation with dense integration and performance.In this paper, all–optical switching in silicon-on-insulator (SOI) serially coupled ring resonator based on thermal nonlinear effect is proposed. The radii of the silicon microring resonator are 10 μm. In experiment, firstly measured by single pump injection technology with vertical coupling surface grating coupler method, the highest notch of serially coupled ring resonator is 17 dB. The strong transverse light-confinement nature of the resonator induces nonlinear optical response with low pump power. Thermal nonlinear effect is achieved by controlling the power of the continuous-wave (CW) pump with very low tuning threshold (0.33 nm). And the slop of resonant wavelength as a function of injected pump is 220 pm/mw. Secondly, switching time measured by two pump injection technology is 3.01 μs and 1.03 μs, respectively. Which could be used in integrated photonic communication circuits based optical logic and slow-light structure.

•The sample was synthesized by a carbon-assisted method using degreasing cotton.•CoCO3 is the intermediate precursor during the preparation.•The lattice expansion rate is related with calcination temperature and grain size.Cobalt oxide nanoparticles with spherical structures (~ 50 nm in diameter) were prepared by a carbon-assisted method using absorbent cotton as the carbon source and cobalt nitrate as the precursor. The phases, particle size, and lattice distortion of the samples obtained at different baking temperatures (200–600 °C) were characterized by X-ray diffraction. The results show that lattice expansion has taken place in the prepared samples. Furthermore, Fourier-transform infrared spectroscopy was used to analyze the phase evolution of Co3O4, showing that CoCO3 is the intermediate precursor. The best temperature (600 °C) for preparing Co3O4 nanoparticles was determined through analysis of the morphology and particle size of the samples using scanning electron microscopy and transmission electron microscopy.

A strong piezoresistive effect of GaAs micro-structure which is based on high electron mobility transistor (HEMT) is reported in this paper. The GaAs HEMT is embedded in the root of the cantilever as the sensitive element in order to detect the deformation. The strain is simulated with the ANSYS software, and the maximum gauge factor is about 26,350, which is nearly a hundred times larger than that of piezoresistive silicon. The high gauge factor is not only due to the option of voltage bias, but also the combination of the piezoresistive and piezoelectric effect. The obtained results demonstrate that GaAs micro-structure based on HEMT can be suitable for high sensitive stress/pressure sensors.Research highlights► The GaAs HEMT as the sensitive element of micro-sensors to detect the deformation. ► The maximum gauge factor of HEMT is much larger than that of piezoresistive silicon. ► The high gauge factor is due to voltage bias and piezoresistive piezoelectric effect.

•A magnetically levitated-triboelectric nanogenerator is proposed.•A Self-Powered Vibration Monitoring Sensor is demonstrated.•The high detection sensitivity and high output performance of the vibrometer are proved.This paper presents a magnetically levitated-triboelectric nanogenerator to harvest mechanical energy and detect acceleration of the vibratrion in the surroundings. Based on the effective conjunction of triboelectrification and electromagnetic induction, maximum power density of 3.23 W m−3 is obtained at 100 MΩ and 10 m s−2 for the triboelectric part, while the electromagnetic part can provide power density of 2.25 W m−2 at 1 KΩ and 10 m s−2. The hybridized nanogenerator also exhibits a good stability for the output performance and a good charging performance. This hybridized nanogenerator can light up 40 commercial light-emitting diode bulbs and charge a 470 μF capacitor by using a power management circuit. Furthermore, due to the magnetically-levitated structure, the hybridized nanogenerator has been utilized as a vibrometer. It can clearly detect the vibration with the acceleration less than 30 m s−2 and amplitude less than 7.5 mm. This work not only presents a novel approach in the field of mechanical energy harvesting, but also a solid step towards self-powered monitoring technology.