[China Instrument Network Instrument Development] The University of Alberta, Canada, released a message that researchers at the university have developed a new method to generate electricity that can be used to charge handheld devices or sensors. The relevant research results were published in the Nature Nanotechnology magazine on December 11, 2017.
(Image from the Internet, invaded)
The discovery set a new world standard for a device called a friction nanogenerator. This frictional nanogenerator can produce a high-intensity direct current, which is a significant improvement over other low-quality alternating currents produced by other research teams. What other teams can do so far is to generate very high voltages, not currents. Ada discovered a new method of obtaining high-strength continuous DC currents.
Conventional triboelectric nanogenerators convert frictional energy into electrical energy by generating alternating triboelectricity, however, this method is limited due to low current density and the need for correction. A large researcher through the sliding Schottky nanocontact can generate a maximum of 106 Am-2 continuous DC current without the need for an external voltage. They do this by sliding the tip of a conductive AFM onto a film of molybdenum disulfide. The finite element simulation results show that the abnormally high current density can be attributed to the phenomenon of unbalanced carrier transmission, which can be enhanced by the strong local electric field (105-106 Vm-2) of the conductive nanotip. The researchers hypothesized that charge transfer may be caused by friction-induced electrical excitation. Nanoscale current-voltage spectroscopy shows that the rectified Schottky barrier at the tip of the sample interface plays a key role in producing efficient DC energy. When combined with microelectrodes or contact surface-modifying electrodes, this concept is scalable, making it a guarantee of efficient DC-friction power generation.
This discovery means that nano-sized generators have the potential to provide energy for devices based on nano-scale motion and vibration such as engines, traffic on roads, and even heartbeat. It can bring technology into a wide range of applications, including sensors that monitor the physical strength of bridges or pipes, and sensors that detect the performance of engines and wearable electronics.
(Original Title: Canada Finds New Ways to Charge Electronic Devices)
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