Researchers have succeeded in making a graphene-based tattoo that can be placed directly on the skin using water. Of course, instead of colorful and artistic designs, this tattoo is almost transparent. The main point of this tattoo is that due to the special electrical properties of graphene, this tattoo can be used as wearable gadgets with capabilities such as measuring the electrical activity of the heart, brain and muscles.

This graphene tattoo is similar to existing electronic devices for health monitoring. These tattoos provide quality information due to their compatibility with the skin. Due to the high quality of these sensors, researchers believe that these tattoos can be a suitable replacement for current medical sensors that stick to the skin and require paste or gel to establish an electrical connection.

Graphene tattoo is a dry physiological sensor that makes a very easy connection with the skin due to its low thickness.

These new tattoos are made of graphene layered on a transparent polymer (PMMA). This double-layered structure is transferred to a regular tattoo paper, which is engraved in different shapes (to produce different sensors). Then this tattoo is engraved on the skin by placing the graphene part on the skin and applying water to the back of the paper. The tattoo will remain on the skin for two days or more in full effect, but can be removed with a piece of tape if needed.

Basically, the diameter of these tattoos is about 450 nm and it is completely compatible with human skin. The elasticity of these tattoos is higher than human skin and they are almost optically and mechanically imperceptible.

Experiments have shown that these tattoos can measure a large number of electrophysiological signals, such as skin temperature and skin moisture, and can also function as ECG, EMG, and EEG, which measure the electrical activity of the muscles, heart, and brain, respectively.