A US research team said that they have developed a transparent flexible friction electric generator. The micro-generator can convert mechanical energy such as walking into electricity, can "feel" the pressure generated by a feather falling down, and can be used to create a self-powered touch screen, and has a wide range of applications in electronic products, environmental monitoring, and medical equipment manufacturing. Huge application potential.
Friction electricity is one of the most common phenomena in nature, whether it is combing, dressing or walking, driving can be encountered. But at the same time, they are difficult to collect and use, so they are often ignored. In the new study, a research team led by Professor Wang Zhonglin of the Georgia Institute of Technology in the United States succeeded in converting friction into available electric power by means of flexible polymer materials.
This triboelectric generator relies on the charge pump effect of the friction point potential to generate electricity through the friction of a polyester fiber sheet with a polydimethylsiloxane (PDMS) sheet. With a separation technique, when friction occurs, charge separation occurs between two polymer films and forms a potential difference, and an electric current can be formed through an external circuit. In friction, polyester fibers produce electrons, and polydimethylsiloxane is responsible for receiving electrons. In addition, the mechanical deformation caused by the external pressure can also cause them to friction produce electricity.
Although smooth surfaces can also generate charges when rubbed against each other, the amount of these charges does not meet the needs of the application. Wang Zhonglin and his team then generated more current by changing the way they rubbed the surface pattern. The researchers tested the lines, cubes, and pyramids respectively. As a result, they found that the surface of the pyramid pattern accelerates the formation of charges during friction, which facilitates the separation of charges, generates the most current, and greatly improves the friction generator. s efficiency.
Since this triboelectric generator is made of a transparent flexible material, it will hopefully replace the currently widely used touch display devices in the future. In addition, the triboelectric generator can also be used as a high-sensitivity pressure sensor. According to the researchers, the pressure sensor is very sensitive, and even small pressures such as falling water droplets or falling feathers can be accurately “feeled†and the device is expected to find applications in organic electronic materials and photovoltaic systems.
According to the researchers, this micro-generator has a simple manufacturing process, low cost, and can be easily applied to large-scale production. At the same time, it also has excellent durability and processability, and can easily be integrated into the design of other products.
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