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Now, sensors can be printed on your skin.

Wearable sensors are integrated into wearable objects or directly with the body in order to help monitor health and/or provide clinically relevant data for care. But recently Wearable sensors are evolving from watches to bendable devices that provide far more precise biometric measurements and comfort for users.

Putting printed circuit boards directly on the skin has been hindered by the bonding process for the metallic components in a sensor called sintering, this process typically requires high temperatures to bond the sensor's silver nanoparticles together.

Since the skin can’t with stand such high temperature, to get around this limitation, a sintering aid layer is added which consists of polyvinyl alcohol paste which is the main ingredient in face masks and calcium carbonate which comprises eggshells. This layer not only permits flexibility but also maintain its electronic capabilities.

These sensors are capable to capturing temperature, humidity, blood oxygen levels and heart performance signals and can have wireless transmission capabilities. The researchers plan to alter the technology to target specific applications as needed, such as a precise on-body sensor network placed to monitor the particular symptoms associated with COVID-19.




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