Georgia Institute of Technology: Scientists developed a microphone of paper the size of a postage stamp, that could charge your phone's battery using sound.
Researchers from Georgia Institute of Technology they used a laser to etch a grid of tiny holes in the paper. They then coated one side with copper and placed it on top of a thin sheet of Teflon, bonding them together two leaves on one end.
The sound waves vibrate the two sheets in different ways, causing them to pulsate, which creates an electrical load, similar to that created by rubbing a balloon on one's hair, reports New Scientist.
The microphone can also be used as a new way recyclingof sound energy from the environment, and could collect the free electrical energy from the "waste" that is heard all around us.
The amount of power the microphone provides depends on its size, but it is about 121 milliwatts per square meter.
"It can be made in any size you want," Zhong Wang said Georgia Institute of Technology.
However, Wang said that if a stamped microphone is placed on the phone, it will provide little energy that will not be enough to fully charge the phone.
