GraphWear is a startup that is developing a graphene-based sweatpatch that detects important biometric data in real-time. It can analyze sweat and communicate its findings via mobile app. It could tell, among other things, when a person needs to drink water in order to prevent a muscle cramp.
Using graphene as the base material in a patch that measures physical markers is facilitated by the fact that graphene is chemically inert. This means it’s chemical composition doesn’t change when exposed to other elements.
The patch is to be worn on the sweatiest part of the body — the lower back. The graphene sensor in the patch syncs with a smartphone app using Bluetooth.