New frictional electrified nanogenerator generates electricity at finger flexion

According to New Atlas, a foreign media researcher, the latest research from the State University of New York at Buffalo and the Chinese Academy of Sciences will one day allow users to leave their chargers at home and use their body movements to recharge mobile phone batteries. The research team developed a frictional electrified nanogenerator in the form of a small metal tag that generates electricity through simple body movements such as finger flexion.

The metal tag utilizes a frictional electrification effect which can generate charges by rubbing against each other using two materials that are easily electrified. In this study, the two materials scientists used were gold and polydimethylsiloxane (PDMS), the thin layer of the former surrounding a layer of the latter. When one of the gold layers is stretched and then released, it deforms and looks like a miniature mountain. Then, when the device bends again, friction occurs between the gold and PDMS layers, generating charge.

Xu Yun of the Chinese Academy of Sciences said: "This will cause electrons to flow back and forth between gold layers. The more friction there is, the more charge will be generated."

The device is only 1.5 centimeters (0.6 inches) in length and 1 centimeter (0.4 inches) in width, and has successfully delivered a maximum of 124 volts with a maximum current of 10 microamps. This is enough for the team to light up 48 red LED lights at the same time. Unlike other friction-producing nanogenerators proposed by scientists, the team stated that their equipment is cost-effective and simple to manufacture.

Gan Qiaoqiang, co-author of the study, said: “Nobody likes to be tied to a power outlet or carry a portable charger. The human body is a rich source of energy. We think: 'Why not use it to generate electricity?'”

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