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Battery-free wireless RFID sensor from graphene oxide for Internet...

• https://www.nextbigfuture.com, brian wang

Researchers have a design that layers graphene oxide, to create flexible heterostructure humidity sensors for remote sensing.

* layer by layer printing allows for scalable and mass production at a very low cost.
* the first printable technology where several 2D materials combine to create a functional device immediately suitable for industrial applications.
* No battery source is neeeded as it harvests power from the receiver, making it more than ideal for the internet of things (IoT) 

Nature Scientific Reports – Graphene Oxide Dielectric Permittivity at GHz and Its Applications for Wireless Humidity Sensing

The relative dielectric permittivity of graphene oxide (GO), both its real and imaginary parts, have been measured under various humidity conditions at GHz. It is demonstrated that the relative dielectric permittivity increases with increasing humidity due to water uptake. This finding is very different to that at a couple of MHz or lower frequency, where the relative dielectric permittivity increases with decreasing humidity.

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