Can you ever be too rich or too thin?
The latter seems to be achievable when it comes to skin patches which can monitor key vital signs like skin temperature, take electroencephalography (EEG) and electromyography (EMG for muscles), and measure hydration. The graphene used in this sensor developed by University of Texas at Austin is 0.3-nm thick, in a polymer 463-nm thick. Unlike Stanford’s stretchy sensor we profiled in November
, this doesn’t stretch, but is so thin as to be highly unobtrusive. It is made by growing single-layer graphene on a copper sheet, which is then coated by a stretchy support polymer. The copper is etched off and the polymer-graphene placed on temporary tattoo paper. The wearer doesn’t sense it because, as the researchers termed it, it is compliant with the nooks and crannies of human skin–and it doesn’t look obnoxious. It can be placed on the chest, on the arm or other locations as needed. Testing indicated good quality signals and in fact, detected EKG signals not registering on a conventional monitor. Presented at IEEE’s International Electron Devices Meeting (IEDM). IEEE Spectrum