Our recent paper “Chest-Laminated Ultrathin and Stretchable E-Tattoo for the Measurement of Electrocardiogram, Seismocardiogram, and Cardiac Time Intervals” is selected as the front cover of Advanced Science. We built a noninvasive e-tattoo capable of synchronous electrocardiogram (ECG) and seismocardiogram (SCG) sensing, which can also be used for beat-to-beat blood pressure (BP) inference. 3D digital image correlation (3D DIC) was used to map chest vibration due to heart beat, which is useful to determine the best location to laminate the e-tattoo.

Graphene electronic tattoo (GET) is a group of ultrathin stretchable dry sensors for measuring electrocardiogram (ECG), electromyogram (EMG), electroencephalogram (EEG), skin temperature, and skin hydration. Because of low thickness (463 ± 30 nm) and ultra low areal mass density of GET, it forms conformal  contact to the skin and stays intact without any adhesive or tape just via van der Waals force. A bare GET is able to stay attached to skin for several hours without fracture or delamination. With liquid bandage coverage, a GET may stay functional on the skin for up to several days. The optical transparency of  GET is ∼85%, and it is more stretchable (40%) than human skin (10 to 30%).  The GET can be directly laminated on human skin just like a temporary tattoo and can fully conform to the microscopic morphology of the skin.

See full paper