Scientists have created the thinnest wireless sensor that can measure people’s condition that doesn’t need chips or power

A group of American engineers developed a prototype of an electronic patch with wireless access, which does not contain microcircuits or power supplies. Due to this development, it is possible to install wearable sensors that monitor the health of humans. Such sensors do not require a wired connection and are not dependent on bulky batteries, controllers and transmitters.

Image source: University of Michigan.

The development is part of a US research group that studied a flawless ultrathin film of gallium nitride. This technology makes it easy to create the purest single-crystal semiconductor films on a graphene substrate and then peel them off for later use.

Gallium nitride is characterized by its piezoelectric properties. It can generate an electrical signal in response to deformation and perform mechanical vibrations in response to a spark. To increase signaling, the scientists applied the finest mesh of gold to the gallium nitride surface. The thickness of the element was 250 nm. It is 100 times thinner than human hair.

The sensors were attached to the skin like a patch. His sensitivity was enough to react to a human heartbeat and respond to the salt in his sweat. The vibrations of the material provide an electrical signal that can be read without contact by a nearby receiver. In other words, the device could transmit sensory information in real time without the need for a motor.

The sensor attached to the skin has its own resonant vibration frequency. As they go from vibrations to electrical signals, these frequencies can be used by a wireless transmitter. Any change in the skin such as a heart rate will affect the mechanical vibrations of the sensor and the electrical signal that it transmits to the receiver automatically. The device responds to some changes in sweat. In addition to changing biomarker sensors, there can be a wide range of datasets based on the type of people’s condition.

If there are changes in the pulse, or chemicals in the sweat, or even ultraviolet exposure of the skin, all of these actions could change the patterns of surface acoustic waves on the gallium nitride film, the study authors note. Our film has high sensitivity, so it can detect these changes.

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