Researchers at the University of Arkansas and the University of Michigan have used graphene inductors to harvest power from the alternating magnetic field around a power cable and run a custom, ultra-low-power temperature sensor without a battery or a power-management chip.
The team fabricated two-dimensional spiral and three-dimensional helix graphene inductors and characterized their inductance by measuring current as a function of applied voltage and frequency. They then measured the voltage and current induced in the inductors as a function of the current flowing in a nearby power cable. A single graphene inductor with an inner steel core produced a voltage high enough to activate a Cockcroft-Walton circuit, which passively rectifies the signal and multiplies its amplitude.
Researchers at the University of Arkansas and the University of Michigan have used graphene inductors to harvest power from the alternating magnetic field around a power cable and run a custom, ultra-low-power temperature sensor without a battery or a power-management chip.The team fabricated two-dimensional spiral and three-dimensional helix graphene inductors and characterized their inductance by measuring current as a function of applied voltage and frequency. They then measured the voltage and current induced in the inductors as a function of the current flowing in a nearby power cable. A single graphene inductor with an inner steel core produced a voltage high enough to activate a Cockcroft-Walton circuit, which passively rectifies the signal and multiplies its amplitude.
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