Phones Can Be Charged Over Wi-Fi Signals Thanks To Graphene

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Scientists at MIT are working on a project to use energy in Wi-Fi signals. The graphene-based device, which has not been tested and manufactured yet, looks successful on paper.

It would be wrong to say that wireless charging systems are more efficient today than wired systems. Even in wireless charging systems, the phone needs to touch a device, but there are a lot of waves moving in the air, and MIT researchers are working on a project where we can use the wasted energy to charge our devices.

Terahertz radiation consists of high-frequency waves in the electromagnetic spectrum between infrared and microwaves. These waves are produced by devices that send Wi-Fi signals. Although these irradiations are very difficult to use, the new method the MIT team has found seems interesting.

Working principle of the device:
It is worth noting that at this stage the system is still in the project phase and has not been tested yet. “We are surrounded by electromagnetic waves in the frequency range of Terahertz radiation. If we turn this energy into an energy that we can use in everyday life, it helps us fight the energy problems we face,” said Hiroki Isobe, one of the scientists who led the study.

The device produced by the team is known as a terahertz rectifier and consists of a small graphene layer with a boron nitride layer underneath and an antenna on both sides. These antennas collect terahertz waves from the air in the environment and strengthen the signals passing to the graphene. These allow electrons to flow in the same direction and generate direct current. Graphene must be as pure as possible, as any foreign matter will affect electron scattering, the team said. Boron nitride layer is also used to prevent this.

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Although Terahertz rectifier produces a small amount of energy at first, it may be enough to charge small devices. The team first states that this device can be used in pacemakers. This device, which may have good results for wireless charging, is expected to be manufactured and tested.


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